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We have further addressed the role of IL-7 and its receptor during B and T cell development by generating mice genetically deficient in IL-7R. Mutant mice display a profound reduction in thymic and peripheral lymphoid cellularity. Analyses of lymphoid progenitor populations in IL-7R-deficient mice define precisely those developmental stages affected by the mutation and reveal a critical role for IL-7R during early lymphoid development. Significantly, these studies indicate that the phase of thymocyte expansion occurring before the onset of T cell receptor gene rearrangement is critically dependent upon, and mediated by the high affinity receptor for IL-7. | Early lymphocyte expansion is severely impaired in interleukin 7 receptor-deficient mice |
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important and challenging goal remaining in HIV-AIDS research. Recent progress using a poxvirus vector prime and envelope protein boost strategy demonstrated a modest but statistically significant level of efficacy and established the concept that a vaccine could prevent HIV infection (1), and approaches to boost durability and efficacy are currently in the planning stages (2). But the results of two vaccine concepts based on recombinant adenovirus serotype-5 (rAd5) (3–5) pointed to a potential major problem—that such vaccines might increase susceptibility to HIV infection. This also raised the question of whether the problem extends to some or all of the other recombinant adenovirus vectors currently in development or to other vector-based vaccines. | Immune Activation with HIV Vaccines |
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1.2140778303146362} | 9164724 | OBJECTIVE Dystrophins, utrophins, and their associated proteins are involved in structural and signaling roles in nonmuscle tissues; however, description of these proteins in neutrophils remained unexplored. Therefore we characterize the pattern expression, and the cellular distribution of dystrophin and utrophin gene products and dystrophin-associated proteins (i.e., beta-dystroglycan, alpha-syntrophin, and alpha-dystrobrevins) in relation to actin filaments in resting and activated with formyl-methionyl-leucyl-phenylalanine human neutrophils. MATERIALS AND METHODS Resting and fMLP-activated human neutrophils were analyzed by immunoblot and by confocal microscopy analysis. Immunoprecipitation assays were performed to corroborate the presence of protein complexes. RESULTS Immunoprecipitation assays and confocal analysis demonstrated the presence of two dystrophin-associated protein complexes in resting and activated neutrophils: the former formed by Dp71d/Dp71Delta(110)(m) and dystrophin-associated proteins (beta-dystroglycan, alpha-syntrophin, alpha-dystrobrevin-1, and -2), while the latter contains Up400, instead of Dp71d/Dp71Delta(110)(m), as a central component of the dystrophin-associated protein complexes (DAPC). Confocal analysis also showed the subcellular redistribution of Dp71d/Dp71Delta(110)(m) approximately DAPC and Up400 approximately DAPC in F-actin-based structures displayed during activation process with fMLP. CONCLUSIONS Our study showed the existence of two protein complexes formed by Dp71d/Dp71Delta(110)(m) or Up400 associated with DAPs in resting and fMLP-treated human polymorphonuclears. The interaction of these complexes with the actin cytoskeleton is indicative of their dynamic participation in the chemotaxis process. | Distribution of dystrophin- and utrophin-associated protein complexes during activation of human neutrophils. |
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0.18978065252304077, "28731": 0.03925827145576477, "28907": 0.15610189735889435, "29025": 0.0174254160374403, "29073": 0.2493593990802765, "29458": 0.0752234235405922, "30258": 0.1401015669107437} | 9167230 | BACKGROUND The annual number of hospital admissions and in-hospital deaths due to severe acute lower respiratory infections (ALRI) in young children worldwide is unknown. We aimed to estimate the incidence of admissions and deaths for such infections in children younger than 5 years in 2010. METHODS We estimated the incidence of admissions for severe and very severe ALRI in children younger than 5 years, stratified by age and region, with data from a systematic review of studies published between Jan 1, 1990, and March 31, 2012, and from 28 unpublished population-based studies. We applied these incidence estimates to population estimates for 2010, to calculate the global and regional burden in children admitted with severe ALRI in that year. We estimated in-hospital mortality due to severe and very severe ALRI by combining incidence estimates with case fatality ratios from hospital-based studies. FINDINGS We identified 89 eligible studies and estimated that in 2010, 11·9 million (95% CI 10·3-13·9 million) episodes of severe and 3·0 million (2·1-4·2 million) episodes of very severe ALRI resulted in hospital admissions in young children worldwide. Incidence was higher in boys than in girls, the sex disparity being greatest in South Asian studies. On the basis of data from 37 hospital studies reporting case fatality ratios for severe ALRI, we estimated that roughly 265,000 (95% CI 160,000-450,000) in-hospital deaths took place in young children, with 99% of these deaths in developing countries. Therefore, the data suggest that although 62% of children with severe ALRI are treated in hospitals, 81% of deaths happen outside hospitals. INTERPRETATION Severe ALRI is a substantial burden on health services worldwide and a major cause of hospital referral and admission in young children. Improved hospital access and reduced inequities, such as those related to sex and rural status, could substantially decrease mortality related to such infection. Community-based management of severe disease could be an important complementary strategy to reduce pneumonia mortality and health inequities. FUNDING WHO. | Global and regional burden of hospital admissions for severe acute lower respiratory infections in young children in 2010: a systematic analysis |
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Previously, we have shown that the region between residues 23 and 97 in p53 is necessary for such activity. In an effort to more precisely map a domain necessary for apoptosis within the N terminus, we found that deletion of the N-terminal 23 amino acids compromises, but does not abolish, p53 induction of apoptosis. Surprisingly, p53(Delta1-42), which lacks the N-terminal 42 amino acids and the previously defined activation domain, retains the ability to induce apoptosis to an even higher level than wild-type p53. A more extensive deletion, which eliminates the N-terminal 63 amino acids, renders p53 completely inert in mediating apoptosis. In addition, we found that both p53(Delta1-42) and p53(Gln22-Ser23) can activate a subset of cellular p53 targets. Furthermore, we showed that residues 53 and 54 are critical for the apoptotic and transcriptional activities of both p53(Delta1-42) and p53(Gln22-Ser23). Taken together, these data suggest that within residues 43-63 lie an apoptotic domain as well as another transcriptional activation domain. We therefore postulate that the apoptotic activity in p53(Gln22-Ser23) and p53(Delta1-42) is still transcription-dependent. | Identification of a novel p53 functional domain that is necessary for mediating apoptosis. |
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"26745": 0.05046287178993225, "27833": 1.3799264430999756, "28093": 0.3963087201118469, "28207": 0.10026945173740387, "28353": 0.06977381557226181, "28993": 0.6265231370925903, "29458": 0.016465263441205025, "29477": 0.77198725938797} | 9171913 | In this prospective study, the relationship between blood lipids and breast cancer risk was examined. Between 1977 and 1983, 31,209 Norwegian women, 20 to 54 years of age, attended a health screening carried out by the Norwegian National Health Screening Services. The screening consisted of a questionnaire, anthropometric measurements, and nonfasting blood drawn for analysis of total serum cholesterol (TC), triglyceride (TG), and high density lipoprotein (HDL) cholesterol. Low density lipoprotein (LDL) cholesterol was calculated by the Friedewald's formula. During the seven to 13 years of follow-up, 302 breast cancer cases were identified by linkage to the Norwegian Cancer Registry. After adjustment for some of the known risk factors of breast cancer, the relative risk of women in the highest quartile of TC compared with women in the lowest quartile was 0.87 (95 percent confidence interval [CI]=0.61–1.23). The corresponding relative risks and CIs were 0.82 (CI=0.58–1.16) for TG, 1.02 (CI=0.73–1.42) for HDL, and 0.93 (CI=0.67–1.29) for LDL. No association between breast cancer risk and blood lipids was found in the total population, nor when the data were divided into those diagnosed before or after the age of 50 as a dividing line between pre- and postmenopausal diagnosis. | Risk of breast cancer in relation to blood lipids: a prospective study of 31,209 Norwegian women |
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0.2516399025917053, "27598": 0.5685047507286072, "27642": 1.034767985343933, "27989": 0.2026219218969345, "28041": 0.24171993136405945, "28440": 0.37707099318504333, "28466": 0.8433839678764343, "28517": 0.11343330889940262, "28685": 0.06795065850019455, "28696": 0.19622190296649933, "28788": 0.0770333781838417, "28828": 0.7701805830001831, "28964": 1.2140778303146362, "29494": 0.9263957738876343, "29516": 0.09317722171545029} | 9178310 | Whether obesity accelerates or suppresses autophagy in adipose tissue is still debatable. To clarify dysregulation of autophagy and its role in pathologies of obese adipose tissue, we focused on lysosomal function, protease maturation and activity, both in vivo and in vitro. First, we showed that autophagosome formation was accelerated, but autophagic clearance was impaired in obese adipose tissue. We also found protein and activity levels of CTSL (cathepsin L) were suppressed in obese adipose tissue, while the activity of CTSB (cathepsin B) was significantly enhanced. Moreover, cellular senescence and inflammasomes were activated in obese adipose tissue. In 3T3L1 adipocytes, downregulation of CTSL deteriorated autophagic clearance, upregulated expression of CTSB, promoted cellular senescence and activated inflammasomes. Upregulation of CTSB promoted additional activation of inflammasomes. Therefore, we suggest lysosomal dysfunction observed in obese adipose tissue leads to lower autophagic clearance, resulting in autophagosome accumulation. Simultaneously, lysosomal abnormalities, including deteriorated CTSL function and compensatory activation of CTSB, caused cellular senescence and inflammasome activation. Our findings strongly suggest lysosomal dysfunction is involved in early pathologies of obese adipose tissue. | Involvement of lysosomal dysfunction in autophagosome accumulation and early pathologies in adipose tissue of obese mice |
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"23943": 0.8057082891464233, "24054": 0.890972912311554, "24269": 0.9900637865066528, "24278": 0.08603433519601822, "24587": 1.1720224618911743, "24848": 0.12642613053321838, "25003": 0.7445381283760071, "25006": 0.23556606471538544, "25194": 0.46424978971481323, "25456": 0.7086513638496399, "25644": 0.3027053773403168, "25708": 1.3838499784469604, "25714": 1.0382318496704102, "25761": 0.02887592278420925, "25971": 0.2516399025917053, "26402": 0.48610860109329224, "26520": 0.043007105588912964, "26601": 0.8135309815406799, "26616": 0.2622140049934387, "26773": 0.5301685929298401, "27094": 0.19381128251552582, "27295": 0.4337083101272583, "27854": 0.9294845461845398, "28156": 0.12642613053321838, "28163": 0.13755162060260773, "28311": 0.6664261221885681, "28636": 0.07068414986133575, "28691": 0.10731173306703568, "28879": 0.20580662786960602, "28915": 0.07159364968538284, "29290": 0.5174443125724792, "29393": 0.037378571927547455, "29494": 0.5438674688339233} | 9185195 | AIMS The vascular endothelial growth factor (VEGF) stimulates angiogenesis by induction of vessel permeability, proliferation, and migration of endothelial cells, an important process in ischaemic diseases. ADP-ribosylation factor (ARF) nucleotide-binding site opener (ARNO) (cytohesin-2) is a guanine exchange factor important for cellular signalling through ARF GTPases. However, a role for ARNO in VEGF-dependent endothelial processes has so far not been documented. Therefore, we investigated whether ARNO has a role in VEGF-dependent activation of endothelial cells and thus vessel permeability. METHODS AND RESULTS ARNO expression was observed in endothelial cells in vitro by RT-PCR, western blotting, and immunofluorescence as well as ex vivo by immunohistochemical staining of mouse aorta. Treatment with the cytohesin inhibitor SecinH3 or with an ARNO siRNA prevented VEGF-dependent Akt activation, assessed by detection of phosphorylated Akt, and proliferation of endothelial cells in vitro, measured by methylthiazoletetrazolium (MTT) reduction. In addition, ARNO suppression reduced VEGF-induced permeability in vessels of the mouse (C57BL/6) cremaster muscle in vivo, as measured by extravasation of fluorescein isothiocyanate (FITC)-dextran. Moreover, ARNO knock-down accelerated ligand-induced reduction in vascular endothelial growth factor receptor-2 (VEGFR-2) surface expression, internalization, and degradation, as assessed by flow cytometry and western blotting, respectively. CONCLUSION Our findings indicate an important and novel role for endothelial ARNO in VEGF-dependent initiation of angiogenesis by regulation of VEGFR-2 internalization in endothelial cells, resulting in the activation of the Akt pathway, vessel permeability, and ultimately endothelial proliferation. Thus, ARNO may be a new essential player in endothelial signalling and angiogenesis. | ARNO regulates VEGF-dependent tissue responses by stabilizing endothelial VEGFR-2 surface expression. |
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"24978": 0.029824240133166313, "24992": 0.0752234235405922, "25117": 1.167778730392456, "25520": 0.08154398202896118, "25644": 0.401551216840744, "25862": 0.034552380442619324, "26131": 0.3588210940361023, "26279": 0.11865071207284927, "26394": 0.17020416259765625, "26402": 0.1064341589808464, "26702": 0.055094651877880096, "26773": 0.5336109399795532, "26835": 1.022197961807251, "26994": 0.013579257763922215, "27321": 0.7258110046386719, "27339": 0.03360854089260101, "27598": 0.6102113127708435, "27710": 1.2905446290969849, "28228": 0.7333439588546753, "28487": 0.21922965347766876, "28522": 0.8893690705299377, "28625": 1.0587663650512695, "28691": 1.185243844985962, "28767": 0.906871497631073, "28788": 0.06703783571720123, "28848": 0.8805016279220581, "28873": 0.21530038118362427, "29090": 0.8408597707748413, "29720": 1.1858406066894531} | 9194077 | Pathogenesis of Alzheimer’s disease (AD), which is characterised by accumulation of extracellular deposits of β-amyloid peptide (Aβ) in the brain, has recently been linked to vascular disorders such as ischemia and stroke. Aβ is constantly produced in the brain from amyloid precursor protein (APP) through its cleavage by β- and γ-secretases and certain Aβ species are toxic for neurones. The brain has an endogenous mechanism of Aβ removal via proteolytic degradation and the zinc metalloproteinase neprilysin (NEP) is a critical regulator of Aβ concentration. Down-regulation of NEP could predispose to AD. By comparing the effects of hypoxia and oxidative stress on expression and activity of the Aβ-degrading enzyme NEP in human neuroblastoma NB7 cells and rat primary cortical neurones we have demonstrated that hypoxia reduced NEP expression at the protein and mRNA levels as well as its activity. On contrary in astrocytes hypoxia increased NEP mRNA expression. | Effects of Hypoxia and Oxidative Stress on Expression of Neprilysin in Human Neuroblastoma Cells and Rat Cortical Neurones and Astrocytes |
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"27928": 0.18492233753204346, "28290": 0.03360854089260101, "28309": 0.12728634476661682, "28436": 1.4151703119277954, "28637": 0.021256839856505394, "28788": 0.25239890813827515, "28892": 0.20102575421333313, "29166": 1.0492360591888428, "29167": 1.0901126861572266, "29206": 0.20660123229026794, "29299": 0.28450319170951843, "29458": 0.05417001247406006} | 9196472 | BACKGROUND Variability of gene expression in human may link gene sequence variability and phenotypes; however, non-genetic variations, alone or in combination with genetics, may also influence expression traits and have a critical role in physiological and disease processes. METHODOLOGY/PRINCIPAL FINDINGS To get better insight into the overall variability of gene expression, we assessed the transcriptome of circulating monocytes, a key cell involved in immunity-related diseases and atherosclerosis, in 1,490 unrelated individuals and investigated its association with >675,000 SNPs and 10 common cardiovascular risk factors. Out of 12,808 expressed genes, 2,745 expression quantitative trait loci were detected (P<5.78x10(-12)), most of them (90%) being cis-modulated. Extensive analyses showed that associations identified by genome-wide association studies of lipids, body mass index or blood pressure were rarely compatible with a mediation by monocyte expression level at the locus. At a study-wide level (P<3.9x10(-7)), 1,662 expression traits (13.0%) were significantly associated with at least one risk factor. Genome-wide interaction analyses suggested that genetic variability and risk factors mostly acted additively on gene expression. Because of the structure of correlation among expression traits, the variability of risk factors could be characterized by a limited set of independent gene expressions which may have biological and clinical relevance. For example expression traits associated with cigarette smoking were more strongly associated with carotid atherosclerosis than smoking itself. CONCLUSIONS/SIGNIFICANCE This study demonstrates that the monocyte transcriptome is a potent integrator of genetic and non-genetic influences of relevance for disease pathophysiology and risk assessment. | Genetics and Beyond – The Transcriptome of Human Monocytes and Disease Susceptibility |
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This work was aimed at studying the effect of (-)-epicatechin (EC) and chlorogenic acid (CGA) on the regulation of apoptotic and survival/proliferation pathways in a human hepatoma cell line (HepG2). EC or CGA treatment for 18 h had a slight effect on cell viability and decreased reactive oxygen species formation, and EC alone promoted cell proliferation, whereas CGA increased glutathione levels. Phenols neither induced the caspase cascade for apoptosis nor affected expression levels of Bcl-xL or Bax. A sustained activation of the major survival signals AKT/PI-3-kinase and ERK was shown in EC-treated cells, rather than in CGA-exposed cells. These data suggest that EC and CGA have no effect on apoptosis and enhance the intrinsic cellular tolerance against oxidative insults either by activating survival/proliferation pathways or by increasing antioxidant potential in HepG2. | Molecular mechanisms of (-)-epicatechin and chlorogenic acid on the regulation of the apoptotic and survival/proliferation pathways in a human hepatoma cell line. |
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Although the mechanisms by which target-derived NGF influences survival of innervating neurons have been extensively investigated, its regulation of axonal growth and target innervation are just being elucidated. Here, we identify Wnt5a, a member of the Wnt family of secreted growth factors, as a key downstream effector of NGF in mediating axonal branching and growth in developing sympathetic neurons. Wnt5a is robustly expressed in sympathetic neurons when their axons are innervating NGF-expressing targets. NGF:TrkA signaling enhances neuronal expression of Wnt5a. Wnt5a rapidly induces axon branching while it has a long-term effect on promoting axon extension. Loss of Wnt5a function revealed that it is necessary for NGF-dependent axonal branching and growth, but not survival, in vitro. Furthermore, Wnt5a(-/-) mice display reduced innervation of NGF-expressing target tissues, and a subsequent increase in neuronal apoptosis, in vivo. Wnt5a functions in developing sympathetic neurons by locally activating protein kinase C in axons. Together, our findings define a novel regulatory pathway in which Wnt5a, expressed in sympathetic neurons in response to target-derived NGF, regulates innervation of peripheral targets. | Wnt5a mediates nerve growth factor-dependent axonal branching and growth in developing sympathetic neurons. |
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"29577": 0.09584271162748337} | 9199796 | Among lower eukaryotes, glucose repression is a conserved, widely spread mechanism regulating carbon catabolism. The yeast Snf1 kinase, the Mig1 DNA-binding repressor and the Mig1-interacting co-repressor complex Cyc8(Ssn6)-Tup1 are central components of this pathway. Previous experiments suggested that cytoplasmic translocation of Mig1, upon its phosphorylation by Snf1 in the nucleus, is the key regulatory step for releasing glucose repression. In this report we re-evaluate this model. We establish the coordinated repressive action of Mig1 and Cyc8-Tup1 on GAL1 transcription, but we find that Cyc8-Tup1 is not tethered by Mig1 to the promoter DNA. We demonstrate that both negative regulators occupy GAL1 continuously under either repression or activation conditions, although the majority of the Mig1 is redistributed to the cytoplasm upon activation. We show that Snf1-dependent phosphorylation of Mig1 abolishes interaction with Cyc8-Tup1, and we propose that regulation of this interaction, not the Mig1 cytoplasmic localization, is the molecular switch that controls transcriptional repression/de-repression. | The Snf1 kinase controls glucose repression in yeast by modulating interactions between the Mig1 repressor and the Cyc8-Tup1 co-repressor. |
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carcinomas may arise from endometriosis, but the molecular events involved in this transformation have not been described. METHODS We sequenced the whole transcriptomes of 18 ovarian clear-cell carcinomas and 1 ovarian clear-cell carcinoma cell line and found somatic mutations in ARID1A (the AT-rich interactive domain 1A [SWI-like] gene) in 6 of the samples. ARID1A encodes BAF250a, a key component of the SWI–SNF chromatin remodeling complex. We sequenced ARID1A in an additional 210 ovarian carcinomas and a second ovarian clear-cell carcinoma cell line and measured BAF250a expression by means of immunohistochemical analysis in an additional 455 ovarian carcinomas. RESULTS ARID1A mutations were seen in 55 of 119 ovarian clear-cell carcinomas (46%), 10 of 33 endometrioid carcinomas (30%), and none of the 76 high-grade serous ovarian carcinomas. Seventeen carcinomas had two somatic mutations each. Loss of the BAF250a protein correlated strongly with the ovarian clear-cell carcinoma and endometrioid carcinoma subtypes and the presence of ARID1A mutations. In two patients, ARID1A mutations and loss of BAF250a expression were evident in the tumor and contiguous atypical endometriosis but not in distant endometriotic lesions. CONCLUSIONS These data implicate ARID1A as a tumor-suppressor gene frequently disrupted in ovarian clear-cell and endometrioid carcinomas. Since ARID1A mutation and loss of BAF250a can be seen in the preneoplastic lesions, we speculate that this is an early event in the transformation of endometriosis into cancer. (Funded by the British Columbia Cancer Foundation and the Vancouver General Hospital–University of British Columbia Hospital Foundation.). | ARID1A mutations in endometriosis-associated ovarian carcinomas. |
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0.07884006202220917, "26601": 0.12556517124176025, "26718": 0.0770333781838417, "26838": 0.006812678650021553, "28046": 1.0257055759429932, "28290": 0.09495500475168228, "28424": 0.021256839856505394, "28767": 1.2840756177902222, "28848": 0.3870677351951599, "29516": 0.14433705806732178} | 9217800 | The fatal adult motor neuron disease amyotrophic lateral sclerosis (ALS) shares some clinical and pathological overlap with frontotemporal dementia (FTD), an early-onset neurodegenerative disorder. The RNA/DNA-binding proteins fused in sarcoma (FUS; also known as TLS) and TAR DNA binding protein-43 (TDP-43) have recently been shown to be genetically and pathologically associated with familial forms of ALS and FTD. It is currently unknown whether perturbation of these proteins results in disease through mechanisms that are independent of normal protein function or via the pathophysiological disruption of molecular processes in which they are both critical. Here, we report that Drosophila mutants in which the homolog of FUS is disrupted exhibit decreased adult viability, diminished locomotor speed, and reduced life span compared with controls. These phenotypes were fully rescued by wild-type human FUS, but not ALS-associated mutant FUS proteins. A mutant of the Drosophila homolog of TDP-43 had similar, but more severe, deficits. Through cross-rescue analysis, we demonstrated that FUS acted together with and downstream of TDP-43 in a common genetic pathway in neurons. Furthermore, we found that these proteins associated with each other in an RNA-dependent complex. Our results establish that FUS and TDP-43 function together in vivo and suggest that molecular pathways requiring the combined activities of both of these proteins may be disrupted in ALS and FTD. | The ALS-associated proteins FUS and TDP-43 function together to affect Drosophila locomotion and life span. |
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Neutrophils are peripheral blood leukocytes that represent the first line of immune cell defense against bacterial and fungal infections but are also crucial players in the generation of the inflammatory response. Many neutrophil cell surface receptors regulate important cellular processes via activation of agonist-activated PI3Ks. We show here that activation of human neutrophils with insoluble immune complexes drives a previously uncharacterized, PI3K-dependent, non-canonical, pro-apoptotic signaling pathway, FcγR-PI3Kβ/δ-Cdc42-Pak-Mek-Erk. This is a rare demonstration of Ras/Raf-independent activation of Erk and of PI3K-mediated activation of Cdc42. In addition, comparative analysis of immune-complex- and fMLF-induced signaling uncovers key differences in pathways used by human and murine neutrophils. The non-canonical pathway we identify in this study may be important for the resolution of inflammation in chronic inflammatory diseases that rely on immune-complex-driven neutrophil activation. | Non-canonical PI3K-Cdc42-Pak-Mek-Erk Signaling Promotes Immune-Complex-Induced Apoptosis in Human Neutrophils |
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"26754": 0.8500841856002808, "26773": 0.5751199722290039, "27099": 0.052318159490823746, "27144": 0.24171993136405945, "27166": 0.255429208278656, "27441": 1.187628984451294, "27854": 0.2470736801624298, "27881": 0.255429208278656, "28156": 0.26296505331993103, "28227": 0.6588751673698425, "28696": 0.07884006202220917, "29206": 1.210009217262268, "29290": 0.5640701055526733} | 9226649 | Chronic inflammation is a known risk factor for tumorigenesis, yet the precise mechanism of this association is currently unknown. The inflammasome, a multiprotein complex formed by NOD-like receptor (NLR) family members, has recently been shown to orchestrate multiple innate and adaptive immune responses, yet its potential role in inflammation-induced cancer has been little studied. Using the azoxymethane and dextran sodium sulfate colitis-associated colorectal cancer model, we show that caspase-1-deficient (Casp1(-/-)) mice have enhanced tumor formation. Surprisingly, the role of caspase-1 in tumorigenesis was not through regulation of colonic inflammation, but rather through regulation of colonic epithelial cell proliferation and apoptosis. Consequently, caspase-1-deficient mice demonstrate increased colonic epithelial cell proliferation in early stages of injury-induced tumor formation and reduced apoptosis in advanced tumors. We suggest a model in which the NLRC4 inflammasome is central to colonic inflammation-induced tumor formation through regulation of epithelial cell response to injury. | Inflammation-induced tumorigenesis in the colon is regulated by caspase-1 and NLRC4. |
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"28309": 0.10026945173740387, "28691": 0.09850110858678818, "28828": 0.29400965571403503, "28901": 0.06795065850019455, "29290": 0.31489628553390503, "29477": 0.08513788133859634, "29514": 0.6338034868240356, "29610": 0.4879087805747986} | 9239963 | Excessive exposure to estradiol represents the main risk factor for endometrial cancer. The abnormally high estradiol levels in the endometrium of women with endometrial cancer are most likely due to overproduction by the tumour itself. Endometrial cancer cells express the genes encoding the steroidogenic enzymes involved in estradiol synthesis. Here we used RT-PCR and Western blot to show that the nuclear receptors SF1 and LRH1, two well-known regulators of steroidogenic gene expression in gonadal and adrenal cells, are also expressed in endometrial cancer cell lines. By transient transfections, we found that SF1 and LRH1, but not the related nuclear receptor NUR77, can activate the promoters of three human steroidogenic genes: STAR, HSD3B2, and CYP19A1 PII. Similarly, forskolin but not PMA, could activate all three promoters. In addition, we found that both SF1 and LRH1 can transcriptionally cooperate with the AP-1 family members c-JUN and c-FOS, known to be associated with enhanced proliferation of endometrial carcinoma cells, to further enhance activation of the STAR, HSD3B2, and CYP19A1 PII promoters. All together, our data provide novel insights into the mechanisms of steroidogenic gene expression in endometrial cancer cells and thus in the regulation of estradiol biosynthesis by tumour cells. | The nuclear receptors SF1 and LRH1 are expressed in endometrial cancer cells and regulate steroidogenic gene transcription by cooperating with AP-1 factors. |
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"26056": 0.0038986403960734606, "26072": 0.020300358533859253, "26077": 0.23402166366577148, "26180": 0.26146242022514343, "26191": 0.9417452812194824, "26226": 0.1734936386346817, "26639": 0.8349450826644897, "26755": 0.2493593990802765, "26777": 0.08871890604496002, "27233": 0.4500300884246826, "27345": 0.04767346754670143, "27441": 0.6538092494010925, "27613": 0.9317949414253235, "27641": 0.2689530849456787, "27962": 0.12038381397724152, "28268": 0.026976587250828743, "28353": 0.18248429894447327, "28389": 0.19622190296649933, "28483": 0.16276304423809052, "28518": 0.07250232994556427, "29172": 1.173231601715088, "29346": 0.32270604372024536, "29593": 0.02316705882549286} | 9244474 | Diet is known to play a major role in the symptoms of the inflammatory bowel disease, Crohn's disease (CD). Although no single diet is appropriate to all individuals, most CD patients are aware of foods that provide adverse or beneficial effects. This study seeks to categorise foods in relation to their effects on symptoms of CD, in a New Zealand Caucasian population. Four hundred and forty-six subjects from two different centres in New Zealand were recruited into the study. An extensive dietary questionnaire (257 food items in 15 groups) recorded self-reported dietary tolerances and intolerances. Across each of the food groups, there were statistically significant differences among responses to foods. A two-dimensional graphical summary enabled stratification of foods according to the probability that they will be either beneficial or detrimental. A small number of foods are frequently considered to be beneficial, including white fish, salmon and tuna, gluten-free products, oatmeal, bananas, boiled potatoes, sweet potatoes (kumara), pumpkin, soya milk, goat's milk and yoghurt. Foods that are typically considered detrimental include grapefruit, chilli or chilli sauce, corn and corn products, peanuts, cream, salami, curried foods, cola drinks, high energy drinks, beer, and red wine. For a number of the food items, the same item that was beneficial for one group of subjects was detrimental to others; in particular soya milk, goat's milk, yoghurt, oatmeal, kiwifruit, prunes, apple, broccoli, cauliflower, linseed, pumpkin seed, sunflower seed, ginger and ginger products, beef, lamb, liver, and oily fish. It was not possible to identify a specific group of food items that should be avoided by all CD patients. The wide range of detrimental items suggests that dietary maintenance of remission is likely to be difficult, and to exclude a substantial number of foods. Personalised diets may be especially important to these individuals. | Dietary factors in chronic inflammation: food tolerances and intolerances of a New Zealand Caucasian Crohn's disease population. |
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"28093": 0.3963087201118469, "28155": 0.27934664487838745, "28309": 0.06246116757392883, "28389": 0.1332872211933136, "28436": 0.2160874605178833, "28696": 0.052318159490823746, "28742": 0.03266380727291107, "28788": 0.7728893756866455, "28828": 0.8264343738555908, "28873": 0.20501139760017395, "28935": 0.3656192123889923, "29023": 0.18978065252304077, "29107": 0.2674594223499298, "29295": 0.28155985474586487} | 9254550 | BACKGROUND & OBJECTIVES Anaemia is commonly observed in children with malaria, but reports on leucocyte and platelet count abnormalities associated with malaria are inconsistent. This study examined the effect of age, gender, parasite density and temperature on haematological parameters in children with acute uncomplicated malaria. METHODS Haematological parameters were determined in children with acute uncomplicated malaria, and these were correlated with age, sex, temperature and parasite density. Statistical analysis was done using SAS 9.1. RESULTS Six hundred and ninety five children with acute uncomplicated malaria participated in the study. The mean age was 51.7 months +/- 33.8. At presentation, anaemia occurred in 43.8% of the patients and children <5 yr had a significantly lower haematocrit (28.4% +/- 4.8) than that of older children (32.8% +/- 4.8) (p <0.001), but the haematocrit was not significantly different by days 14 and 28. There was no difference between both sexes. Leucocytosis was more frequently seen than leucopenia (9.5% vs 3%). Thrombocytopenia was found in 59.3% of enrolled patients. More than half of the patients with thrombocytopenia had recovered by Day 28. Baseline platelet count was related to Day 14 (r = 0.6, p < 0.0001) and Day 28 (r = 0.2, p = 0.0015) and the haematocrit on Day 28 (r = 0.12, p = 0.00197). Platelet count showed no correlation with temperature, parasite density and leucocyte count. Haematocrit correlated with age (r = 0.4, p < 0.0001); but not with parasite density or temperature. Leucocyte count showed no correlation with age or parasite density. CONCLUSION While thrombocytopenia was the most common haematological finding and may be of diagnostic importance, anaemia and leucocytosis were more common in the under fives. | Age as a risk factor for thrombocytopenia and anaemia in children treated for acute uncomplicated falciparum malaria. |
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Pharmacological inhibition of tyrosine hydroxylase reduces observed catecholamine levels, suggesting catecholamine synthesis by lymphocytes. Intracellular dopamine levels are shown to be increased by extra-cellular dopamine, suggesting a cellular-uptake mechanism. Furthermore, incubation with either dopamine or L-dihydroxyphenylalanine, a precursor of dopamine, results in a dose-dependent inhibition of lymphocyte proliferation and differentiation. Together, these results suggest the presence of an autocrine loop whereby lymphocytes down-regulate their own activity. | Discovery of endogenous catecholamines in lymphocytes and evidence for catecholamine regulation of lymphocyte function via an autocrine loop. |
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Prions consist of PrPSc, a misfolded and aggregated form of the cellular prion protein (PrPC). We explore the antiprion properties of luminescent conjugated polythiophenes (LCPs) that bind and stabilize ordered protein aggregates. By administering a library of structurally diverse LCPs to the brains of prion-infected mice via osmotic minipumps, we found that antiprion activity required a minimum of five thiophene rings bearing regularly spaced carboxyl side groups. Solid-state nuclear magnetic resonance analyses and molecular dynamics simulations revealed that anionic side chains interacted with complementary, regularly spaced cationic amyloid residues of model prions. These findings allowed us to extract structural rules governing the interaction between LCPs and protein aggregates, which we then used to design a new set of LCPs with optimized binding. The new set of LCPs showed robust prophylactic and therapeutic potency in prion-infected mice, with the lead compound extending survival by >80% and showing activity against both mouse and hamster prions as well as efficacy upon intraperitoneal administration into mice. These results demonstrate the feasibility of targeted chemical design of compounds that may be useful for treating diseases of aberrant protein aggregation such as prion disease. | Structure-based drug design identifies polythiophenes as antiprion compounds |
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"29458": 0.26446542143821716} | 9274291 | PURPOSE To compare expectations for cancer survivorship care between patients and their physicians and between primary care providers (PCPs) and oncologists. METHODS Survivors and their physicians were surveyed to evaluate for expectations regarding physician participation in primary cancer follow-up, screening for other cancers, general preventive health, and management of comorbidities. RESULTS Of 992 eligible survivors and 607 physicians surveyed, 535 (54%) and 378 (62%) were assessable, respectively. Among physician respondents, 255 (67%) were PCPs and 123 (33%) were oncologists. Comparing patients with their oncologists, expectations were highly discrepant for screening for cancers other than the index one (agreement rate, 29%), with patients anticipating significantly more oncologist involvement. Between patients and their PCPs, expectations were most incongruent for primary cancer follow-up (agreement rate, 35%), with PCPs indicating they should contribute a much greater part to this aspect of care. Expectations between patients and their PCPs were generally more concordant than between patients and their oncologists. PCPs and oncologists showed high discordances in perceptions of their own roles for primary cancer follow-up, cancer screening, and general preventive health (agreement rates of 3%, 44%, and 51%, respectively). In the case of primary cancer follow-up, both PCPs and oncologists indicated they should carry substantial responsibility for this task. CONCLUSION Patients and physicians have discordant expectations with respect to the roles of PCPs and oncologists in cancer survivorship care. Uncertainties around physician roles and responsibilities can lead to deficiencies in care, supporting the need to make survivorship care planning a standard component in cancer management. | Comparisons of patient and physician expectations for cancer survivorship care. |
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"28805": 0.10203468054533005, "28873": 1.2301886081695557, "29061": 0.07159364968538284} | 9278263 | The cell surface display of peptides by MHC class I molecules to lymphocytes provides the host with an important surveillance mechanism to protect against invading pathogens. However, in turn, viruses have evolved elegant strategies to inhibit various stages of the MHC class I antigen presentation pathway and prevent the display of viral peptides. This Review highlights how the elucidation of mechanisms of viral immune evasion is important for advancing our understanding of virus–host interactions and can further our knowledge of the MHC class I presentation pathway as well as other cellular pathways. | MHC class I antigen presentation: learning from viral evasion strategies |
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We showed that the cSMAC formed by fusion of microclusters contained more CD45 than microclusters and is a site enriched in lysobisphosphatidic acid, a lipid involved in sorting ubiquitinated membrane proteins for degradation. Calcium signaling via TCR was blocked within 2 min by anti-MHCp treatment and 1 min by latrunculin-A treatment. TCR-MHCp interactions in the cSMAC survived these perturbations for 10 min and hence were not sufficient to sustain signaling. TCR microclusters were also resistant to disruption by anti-MHCp and latrunculin-A treatments. We propose that TCR signaling is sustained by stabilized microclusters and is terminated in the cSMAC, a structure from which TCR are sorted for degradation. Our studies reveal a role for F-actin in TCR signaling beyond microcluster formation. | T cell receptor-proximal signals are sustained in peripheral microclusters and terminated in the central supramolecular activation cluster. |
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0.16524957120418549, "29458": 0.9944084882736206, "29602": 0.02412080205976963} | 9285396 | BACKGROUND Although the red cell distribution width (RDW) has been reported as a reliable predictor of prognosis in several types of cancer, to our knowledge the prognostic value of RDW in gastric carcinoma has not been studied, so far. OBJECTIVE We aimed to investigate the role of red cell distribution width (RDW) in predicting prognosis in gastric cancer patients. METHODS All gastric cancer patients who underwent curative surgery (n= 172, 110M/62F) over a five-year study period were evaluated. Data on demographics, preoperative RDW levels, tumor characteristics (early stage: I and II, advanced stage: IIIA-B-C), disease-free (DFS) and overall survival (OS) were retrospectively reviewed. Patients were classified as high RDW group (RDW ≥ 16, n= 62) or low RDW group (RDW < 16, n= 110). RESULTS Overall mortality and postoperative 60-day mortality in both groups were 55% and 14%, respectively. A borderline significant association between RDW (0.063) and mortality was noted. Preoperative RDW levels were significantly higher in patients with short-term mortality (17.9 ± 4.3 vs. 16 ± 3.2, p= 0.015). In high RDW group, the incidence of advanced gastric cancer was significantly higher (75 vs. 51%, p= 0.002), whereas DFS (0.035) and OS (p= 0.04) were lower. CONCLUSION The frequency of advanced cancer was high in patients with high RDWvalues. High RDW values were strongly associated with short-term mortality although only a borderline relationship with overall survival was observed. | The role of red cell distribution width in the prognosis of patients with gastric cancer. |
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"25125": 0.9294845461845398, "25172": 0.304147332906723, "25185": 0.7665573358535767, "25292": 0.04113444685935974, "25456": 0.083342544734478, "25543": 0.5909284353256226, "25608": 1.1262223720550537, "25619": 0.5301685929298401, "25714": 0.34023189544677734, "25746": 0.053244512528181076, "25808": 1.0471819639205933, "25862": 0.9922385215759277, "26243": 0.19782574474811554, "26261": 0.0038986403960734606, "26402": 0.1685553640127182, "26591": 0.1946154683828354, "26651": 0.5209306478500366, "26721": 0.4752389192581177, "26942": 0.4177590310573578, "27152": 0.8796916007995605, "27325": 0.10993985831737518, "27347": 0.11430477350950241, "27491": 0.7969439625740051, "28032": 0.77198725938797, "28156": 0.4512746334075928, "28413": 0.06703783571720123, "28696": 0.18248429894447327, "28915": 0.5033760666847229, "28965": 0.0797421783208847, "29048": 0.9958525896072388, "29160": 0.8583967685699463, "29167": 1.2290464639663696, "29592": 0.4041621685028076} | 9288638 | OBJECTIVE The aim of this study was to investigate whether diabetes and hypertension cause additive effects in the responses to various vasoconstrictor and vasodilator agents, in isolated perfused kidneys obtained from streptozotocin (STZ)-diabetic Wistar-Kyoto (WKY) rats and from diabetic spontaneously hypertensive rats (SHR). METHODS SHR and WKY rats were administered STZ 55 mg/kg by intravenous injection into a lateral tail vein at age 12 weeks. Eight weeks later the kidneys were isolated and perfused via the left renal artery with a physiological salt solution. Renal perfusion pressure was measured continuously. Concentration response curves were plotted for various vasoconstrictor and vasodilator agents. RESULTS Both the diabetic and the hypertensive state were associated with an increased wet kidney weight. The contractile responses of the renal arterial system to phenylephrine (PhE), serotonin (5-HT) and angiotensin II (Ang II) in terms both of the maximal rise in perfusion pressure (mmHg) and of the sensitivity (log EC50) were the same in preparations from diabetic WKY rats and in those from normoglycaemic WKY rats. The maximal contractile responses both to PhE and to Ang II were enhanced in kidneys from SHR compared with those in kidneys from their normotensive controls, whereas simultaneously occurring diabetes impaired this sensitization. After precontraction with 3 x 10(-6) mol/l PhE both endothelium-dependent (methacholine) and endothelium-independent (sodium nitroprusside) vasodilator drugs caused the same vasodilator response in the preparations taken from the four groups of animals. CONCLUSION In isolated perfused kidneys obtained from STZ-diabetic WKY rats and SHR, the isolated diabetic state did not influence the vasoconstriction caused by various agonists. However, the enhanced vascular reactivity in the hypertensive state was blunted by simultaneously occurring diabetes mellitus. Endothelium-dependent and -independent vasorelaxation in this model was not affected neither by the hypertensive nor by the diabetic state. | Vascular responsiveness in isolated perfused kidneys of diabetic hypertensive rats. |
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"26651": 0.12642613053321838, "26702": 0.013579257763922215, "26874": 0.987156867980957, "27099": 0.4909018874168396, "27152": 0.11168810725212097, "27169": 0.15442965924739838, "27226": 0.025073638185858727, "27336": 0.06154331564903259, "27642": 0.8374842405319214, "27790": 0.08244366943836212, "28024": 0.4709797203540802, "28086": 0.11951763927936554, "28263": 0.18329764902591705, "28324": 0.13157635927200317, "28424": 0.25088030099868774, "28427": 0.3723714053630829, "28522": 0.8973627090454102, "28691": 0.11865071207284927, "29034": 0.06612417846918106, "29162": 0.030771657824516296, "29170": 0.28082266449928284, "29206": 0.04113444685935974, "29290": 0.33605360984802246, "29391": 0.4512746334075928, "29458": 0.07341018319129944, "29598": 0.5584990978240967, "29611": 0.04394211992621422} | 9291596 | Following introduction of DNA interstrand cross-links (ICLs), mammalian cells display chromosome breakage or cell cycle delay with a 4N DNA content. To further understand the nature of the delay, previously described as a G(2)/M arrest, we developed a protocol to generate ICLs during specific intervals of the cell cycle. Synchronous populations of G(1), S, and G(2) cells were treated with photoactivated 4'-hydroxymethyl-4,5',8-trimethylpsoralen (HMT) and scored for normal passage into mitosis. In contrast to what was found for ionizing radiation, ICLs introduced during G(2) did not result in a G(2)/M arrest, mitotic arrest, or chromosome breakage. Rather, subsequent passage through S phase was required to trigger both chromosome breakage and arrest in the next cell cycle. Similarly, ICLs introduced during G(1) did not cause a G(1)/S arrest. We conclude that DNA replication is required to elicit the cellular responses of cell cycle arrest and genomic instability after psoralen-induced ICLs. In primary human fibroblasts, the 4N DNA content cell cycle arrest triggered by ICLs was long lasting but reversible. Kinetic analysis suggested that these cells could remove up to approximately 2,500 ICLs/genome at an average rate of 11 ICLs/genome/h. | DNA replication is required To elicit cellular responses to psoralen-induced DNA interstrand cross-links. |
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0.03831886500120163, "26305": 0.06154331564903259, "26462": 0.9842413663864136, "26512": 0.7500885725021362, "26601": 0.9576126337051392, "26906": 0.5483922958374023, "27373": 0.2622140049934387, "28436": 0.659380316734314, "28767": 0.12728634476661682, "28964": 0.9613537192344666, "29101": 0.02887592278420925, "29206": 1.3321186304092407, "29458": 0.6684301495552063} | 9291668 | The process of aging results in a host of changes at the cellular and molecular levels, which include senescence, telomere shortening, and changes in gene expression. Epigenetic patterns also change over the lifespan, suggesting that epigenetic changes may constitute an important component of the aging process. The epigenetic mark that has been most highly studied is DNA methylation, the presence of methyl groups at CpG dinucleotides. These dinucleotides are often located near gene promoters and associate with gene expression levels. Early studies indicated that global levels of DNA methylation increase over the first few years of life and then decrease beginning in late adulthood. Recently, with the advent of microarray and next-generation sequencing technologies, increases in variability of DNA methylation with age have been observed, and a number of site-specific patterns have been identified. It has also been shown that certain CpG sites are highly associated with age, to the extent that prediction models using a small number of these sites can accurately predict the chronological age of the donor. Together, these observations point to the existence of two phenomena that both contribute to age-related DNA methylation changes: epigenetic drift and the epigenetic clock. In this review, we focus on healthy human aging throughout the lifetime and discuss the dynamics of DNA methylation as well as how interactions between the genome, environment, and the epigenome influence aging rates. We also discuss the impact of determining 'epigenetic age' for human health and outline some important caveats to existing and future studies. | DNA methylation and healthy human aging |
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"26616": 0.42096930742263794, "26773": 0.7845434546470642, "26775": 0.45251765847206116, "27099": 0.23710809648036957, "27295": 0.04487626627087593, "27854": 0.2607102394104004, "28139": 0.8829278349876404, "28156": 0.08961215615272522, "28691": 0.2247048318386078, "28723": 1.04512357711792, "28835": 0.7818660736083984, "28848": 0.4914994537830353, "29290": 0.7454653382301331, "29514": 0.1994270235300064, "29610": 1.0735615491867065} | 9301606 | Parathyroid hormone (PTH), a major regulator of bone metabolism, activates the PTHR1 receptor on the osteoblast plasma membrane to initiate signaling and induce transcription of primary response genes. Subsequently, primary genes with transcriptional activity regulate expression of downstream PTH targets. We have identified the adenovirus E4 promoter-binding protein/nuclear factor regulated by IL-3 (E4bp4) as a PTH-induced primary gene in osteoblasts. E4BP4 is a basic leucine zipper (bZIP) transcription factor that represses or activates transcription in non-osteoblastic cells. We report here that PTH rapidly and transiently induced E4bp4 mRNA in osteoblastic cells and that this induction did not require protein synthesis. PTH also induced E4BP4 protein synthesis and E4BP4 binding to a consensus but not to a mutant E4BP4 response element (EBPRE). E4BP4 overexpression inhibited an EBPRE-containing promoter-reporter construct, whereas PTH treatment attenuated activity of the same construct in primary mouse osteoblasts. Finally, E4BP4 overexpression inhibited PTH-induced activity of a cyclooxygenase-2 promoter-reporter construct. Our data suggest a role for E4BP4 in attenuation of PTH target gene transcription in osteoblasts. | Parathyroid hormone-induced E4BP4/NFIL3 down-regulates transcription in osteoblasts. |
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"26001": 0.07431721687316895, "26083": 0.09672962874174118, "26287": 1.018678069114685, "26288": 0.23864774405956268, "26402": 0.09317722171545029, "26475": 1.0389231443405151, "26513": 0.2394166737794876, "26524": 0.5347557663917542, "26835": 0.18573370575904846, "27034": 0.09672962874174118, "27296": 0.14686977863311768, "27531": 1.0172666311264038, "27598": 0.7610978484153748, "27749": 0.05694137513637543, "27764": 0.010684899985790253, "27777": 0.4537591338157654, "27854": 0.025073638185858727, "28046": 0.012615402229130268, "28282": 0.09850110858678818, "28283": 0.8004589080810547, "28309": 0.09938567131757736, "28424": 0.175953671336174, "28667": 0.42926809191703796, "28829": 0.5957841277122498, "28927": 0.20421554148197174, "29403": 0.11778303235769272} | 9304312 | Synaptic transmission depends on clathrin-mediated recycling of synaptic vesicles (SVs). How select SV proteins are targeted for internalization has remained elusive. Stonins are evolutionarily conserved adaptors dedicated to endocytic sorting of the SV protein synaptotagmin. Our data identify the molecular determinants for recognition of synaptotagmin by stonin 2 or its Caenorhabditis elegans orthologue UNC-41B. The interaction involves the direct association of clusters of basic residues on the surface of the cytoplasmic domain of synaptotagmin 1 and a beta strand within the mu-homology domain of stonin 2. Mutation of K783, Y784, and E785 to alanine within this stonin 2 beta strand results in failure of the mutant stonin protein to associate with synaptotagmin, to accumulate at synapses, and to facilitate synaptotagmin internalization. Synaptotagmin-binding-defective UNC-41B is unable to rescue paralysis in C. elegans stonin mutant animals, suggesting that the mechanism of stonin-mediated SV cargo recognition is conserved from worms to mammals. | Molecular basis of synaptic vesicle cargo recognition by the endocytic sorting adaptor stonin 2 |
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0.06246116757392883, "27617": 0.06246116757392883, "27642": 0.637939989566803, "27678": 0.18816383183002472, "27777": 0.07793712615966797, "27815": 0.3416208028793335, "28086": 0.04113444685935974, "28424": 0.38574060797691345, "28911": 0.6823468804359436, "29490": 0.18573370575904846} | 9306247 | BACKGROUND Analysis of fetal DNA in maternal plasma has recently been introduced as a new method for noninvasive prenatal diagnosis, particularly for the analysis of fetal genetic traits, which are absent from the maternal genome, e.g., RHD or Y-chromosome-specific sequences. To date, the analysis of other fetal genetic traits has been more problematic because of the overwhelming presence of maternal DNA sequences in the circulation. We examined whether different biochemical properties can be discerned between fetal and maternal circulatory DNA. METHODS Plasma DNA was examined by agarose gel electrophoresis. The fractions of fetal and maternal DNA in size-fractionated fragments were assayed by real-time PCR. The determination of paternally and maternally inherited fetal genetic traits was examined by use of highly polymorphic chromosome-21-specific microsatellite markers. RESULTS Size fractionation of circulatory DNA indicated that the major portion of cell-free fetal DNA had an approximate molecular size of <0.3 kb, whereas maternally derived sequences were, on average, considerably larger than 1 kb. Analysis of size-fractionated DNA (</=0.3 kb) from maternal plasma samples facilitated the ready detection of paternally and maternally inherited microsatellite markers. CONCLUSIONS Circulatory fetal DNA can be enriched by size selection of fragment sizes less than approximately 0.3 kb. Such selection permits easier analysis of both paternally and maternally inherited DNA polymorphisms. | Size separation of circulatory DNA in maternal plasma permits ready detection of fetal DNA polymorphisms. |
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0.12384103983640671, "27013": 0.21214580535888672, "27054": 0.13157635927200317, "27152": 0.7809720039367676, "27354": 0.083342544734478, "27598": 0.5860490798950195, "27710": 1.437685251235962, "28041": 0.09317722171545029, "28329": 0.037378571927547455, "28413": 0.5092619061470032, "28436": 0.16524957120418549, "28578": 0.1685553640127182, "28691": 0.11778303235769272, "28846": 0.04860413447022438, "29139": 0.0058422754518687725, "29200": 0.29981520771980286, "29258": 0.4151833653450012, "29361": 0.4311734735965729, "29592": 0.9500881433486938, "29657": 0.01934296265244484} | 9310407 | INTRODUCTION Isotonic crystalloids play a central role in perioperative fluid management. Isooncotic preparations of colloids (for example, human albumin or hydroxyethyl starch) remain nearly completely intravascular when infused to compensate for acute blood losses. Recent data were interpreted to indicate a comparable intravascular volume effect for crystalloids, challenging the occasionally suggested advantage of using colloids to treat hypovolemia. General physiological knowledge and clinical experience, however, suggest otherwise. METHODS In a prospective study, double-tracer blood volume measurements were performed before and after intended normovolemic hemodilution in ten female adults, simultaneously substituting the three-fold amount of withdrawn blood with Ringer's lactate. Any originated deficits were substituted with half the volume of 20% human albumin, followed by a further assessment of blood volume. To assess significance between the measurements, repeated measures analysis of variance (ANOVA) according to Fisher were performed. If significant results were shown, paired t tests (according to Student) for the singular measurements were taken. P < 0.05 was considered to be significant. RESULTS A total of 1,097 ± 285 ml of whole blood were withdrawn (641 ± 155 ml/m(2) body surface area) and simultaneously replaced by 3,430 ± 806 ml of Ringer's lactate. All patients showed a significant decrease in blood volume after hemodilution (-459 ± 185 ml; P < 0.05) that did not involve relevant hemodynamical changes, and a significant increase in interstitial water content (+2,157 ± 606 ml; P < 0.05). The volume effect of Ringer's lactate was 17 ± 10%. The infusion of 245 ± 64 ml of 20% human albumin in this situation restored blood volume back to baseline values, the volume effect being 184 ± 63%. CONCLUSIONS Substitution of isolated intravascular deficits in cardiopulmonary healthy adults with the three-fold amount of Ringer's lactate impedes maintenance of intravascular normovolemia. The main side effect was an impressive interstitial fluid accumulation, which was partly restored by the intravenous infusion of 20% human albumin. We recommend to substitute the five-fold amount of crystalloids or to use an isooncotic preparation in the face of acute bleeding in patients where edema prevention might be advantageous. | The intravascular volume effect of Ringer's lactate is below 20%: a prospective study in humans |
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"27833": 1.104454517364502, "27854": 0.04394211992621422, "27975": 0.26446542143821716, "28014": 1.0688776969909668, "28032": 0.37304413318634033, "28093": 0.08961215615272522, "28156": 0.35060185194015503, "28227": 0.2026219218969345, "28483": 0.5756692886352539, "28487": 0.6451379656791687, "28522": 1.141931176185608, "28697": 0.08782484382390976, "28915": 0.16359257698059082, "28939": 0.3012613356113434, "29107": 0.29981520771980286, "29166": 0.9363996982574463, "29290": 0.24171993136405945, "29513": 1.1166772842407227} | 9315213 | BACKGROUND Fibroblast growth factor 21 (FGF21) is a metabolic hormone with pleiotropic effects on glucose and lipid metabolism and insulin sensitivity. It acts as a key downstream target of both peroxisome proliferator-activated receptor α and γ, the agonists of which have been used for lipid lowering and insulin sensitization, respectively. However, the role of FGF21 in the cardiovascular system remains elusive. METHODS AND RESULTS The roles of FGF21 in atherosclerosis were investigated by evaluating the impact of FGF21 deficiency and replenishment with recombinant FGF21 in apolipoprotein E(-/-) mice. FGF21 deficiency causes a marked exacerbation of atherosclerotic plaque formation and premature death in apolipoprotein E(-/-) mice, which is accompanied by hypoadiponectinemia and severe hypercholesterolemia. Replenishment of FGF21 protects against atherosclerosis in apolipoprotein E(-/-)mice via 2 independent mechanisms, inducing the adipocyte production of adiponectin, which in turn acts on the blood vessels to inhibit neointima formation and macrophage inflammation, and suppressing the hepatic expression of the transcription factor sterol regulatory element-binding protein-2, thereby leading to reduced cholesterol synthesis and attenuation of hypercholesterolemia. Chronic treatment with adiponectin partially reverses atherosclerosis without obvious effects on hypercholesterolemia in FGF21-deficient apolipoprotein E(-/-) mice. By contrast, the cholesterol-lowering effects of FGF21 are abrogated by hepatic expression of sterol regulatory element-binding protein-2. CONCLUSIONS FGF21 protects against atherosclerosis via fine tuning the multiorgan crosstalk among liver, adipose tissue, and blood vessels. | Fibroblast Growth Factor 21 Prevents Atherosclerosis by Suppression of Hepatic Sterol Regulatory Element-Binding Protein-2 and Induction of Adiponectin in Mice |
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FEATURES VARNA implements four drawing algorithms, supports input/output using the classic formats dbn, ct, bpseq and RNAML and exports the drawing as five picture formats, either pixel-based (JPEG, PNG) or vector-based (SVG, EPS and XFIG). It also allows manual modification and structural annotation of the resulting drawing using either an interactive point and click approach, within a web server or through command-line arguments. AVAILABILITY VARNA is a free software, released under the terms of the GPLv3.0 license and available at http://varna.lri.fr. SUPPLEMENTARY INFORMATION Supplementary data are available at Bioinformatics online. | VARNA: Interactive drawing and editing of the RNA secondary structure |
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0.5393219590187073, "29295": 0.19782574474811554} | 9334631 | OBJECTIVE C-Reactive protein (CRP), a cardiovascular risk marker, could also participate in atherosclerosis. Atherosclerotic plaques express CRP and interleukin (IL)-10, a major antiinflammatory cytokine. IL-10 deficiency results in increased lesion formation, whereas IL-10 delivery attenuates lesions. We tested the effect of CRP on lipopolysaccharide (LPS)-induced IL-10 secretion in human monocyte-derived macrophages (HMDMs). METHODS AND RESULTS Incubation of HMDMs with CRP significantly decreased LPS-induced IL-10 mRNA and intracellular and secreted IL-10 protein and destabilized IL-10 mRNA. Also, CRP alone increased secretion of IL-8, IL-6, and tumor necrosis factor from HMDMs and did not inhibit LPS-induced secretion of these cytokines. Fc gamma receptor I antibodies significantly reversed CRP-mediated IL-10 inhibition. CRP significantly decreased intracellular cAMP, phospho-cAMP response element binding protein (pCREB), and adenyl cyclase activity. cAMP agonists reversed CRP-mediated IL-10 inhibition. Overexpression of wild-type and constitutively active CREB in THP-1 cells revealed attenuation of the inhibitory effect of CRP on LPS-induced IL-10 levels. CRP also inhibited hemoglobin:haptoglobin-induced IL-10 and heme oxygenase-1. Furthermore, administration of human CRP to rats significantly decreased IL-10 levels. CONCLUSIONS This study provides novel evidence that CRP, by decreasing IL-10 alters the antiinflammatory/proinflammatory balance, accentuating inflammation, which is pivotal in atherothrombosis. | C-reactive protein decreases interleukin-10 secretion in activated human monocyte-derived macrophages via inhibition of cyclic AMP production. |
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0.03925827145576477, "24203": 0.14686977863311768, "24731": 0.021256839856505394, "25002": 0.28743788599967957, "25219": 1.0841858386993408, "26296": 0.6186635494232178, "26356": 0.7665573358535767, "26520": 0.9045027494430542, "26572": 0.7889899015426636, "26616": 0.22937409579753876, "26629": 0.9409833550453186, "26846": 1.1356772184371948, "26874": 0.4311734735965729, "27059": 0.6000806093215942, "27216": 1.0464962720870972, "27233": 0.27786844968795776, "27642": 0.8877626657485962, "28024": 0.8264343738555908, "28038": 0.7755908370018005, "28086": 0.010684899985790253, "28227": 0.347847044467926, "29025": 0.15860503911972046, "29723": 0.49864232540130615} | 9379687 | DNA polymerase ε (Pol ε) is involved in DNA replication, repair, and cell-cycle checkpoint control in eukaryotic cells. Although the roles of replicative Pol α and Pol δ in chromosomal DNA replication are relatively well understood and well documented, the precise role of Pol ε in chromosomal DNA replication is not well understood. This study uses a Xenopus egg extract DNA replication system to further elucidate the replicative role(s) played by Pol ε. Previous studies show that the initiation timing and elongation of chromosomal DNA replication are markedly impaired in Pol ε-depleted Xenopus egg extracts, with reduced accumulation of replicative intermediates and products. This study shows that normal replication is restored by addition of Pol ε holoenzyme to Pol ε-depleted extracts, but not by addition of polymerase-deficient forms of Pol ε, including polymerase point or deletion mutants or incomplete enzyme complexes. Evidence is also provided that Pol ε holoenzyme interacts directly with GINS, Cdc45p and Cut5p, each of which plays an important role in initiation of chromosomal DNA replication in eukaryotic cells. These results indicate that the DNA polymerase activity of Pol ε holoenzyme plays an essential role in normal chromosomal DNA replication in Xenopus egg extracts. These are the first biochemical data to show the DNA polymerase activity of Pol ε holoenzyme is essential for chromosomal DNA replication in higher eukaryotes, unlike in yeasts. | The DNA polymerase activity of Pol ε holoenzyme is required for rapid and efficient chromosomal DNA replication in Xenopus egg extracts |
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The forkhead box O (FOXO) transcription factor DAF-16 (hereafter referred to as DAF-16/FOXO) is a central nexus in these responses, but despite its importance little is known about how it regulates its target genes. Proteomic identification of DAF-16/FOXO-binding partners in Caenorhabditis elegans and their subsequent functional evaluation by RNA interference revealed several candidate DAF-16/FOXO cofactors, most notably the chromatin remodeller SWI/SNF. DAF-16/FOXO and SWI/SNF form a complex and globally co-localize at DAF-16/FOXO target promoters. We show that specifically for gene activation, DAF-16/FOXO depends on SWI/SNF, facilitating SWI/SNF recruitment to target promoters, to activate transcription by presumed remodelling of local chromatin. For the animal, this translates into an essential role for SWI/SNF in DAF-16/FOXO-mediated processes, in particular dauer formation, stress resistance and the promotion of longevity. Thus, we give insight into the mechanisms of DAF-16/FOXO-mediated transcriptional regulation and establish a critical link between ATP-dependent chromatin remodelling and lifespan regulation. | DAF-16/FOXO employs the chromatin remodeller SWI/SNF to promote stress resistance and longevity |
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"26601": 0.7809720039367676, "26702": 0.037378571927547455, "26745": 0.06337817758321762, "26775": 1.0695481300354004, "27433": 0.13499516248703003, "27881": 0.15442965924739838, "28055": 0.6492279767990112, "28207": 0.18654440343379974, "28353": 0.030771657824516296, "28621": 0.13755162060260773, "28756": 0.46117570996284485, "28952": 0.053244512528181076, "29361": 0.02316705882549286, "29458": 0.045809537172317505, "29596": 0.04394211992621422} | 9394119 | IMPORTANCE Limited information about the relationship between specific mutations in BRCA1 or BRCA2 (BRCA1/2) and cancer risk exists. OBJECTIVE To identify mutation-specific cancer risks for carriers of BRCA1/2. DESIGN, SETTING, AND PARTICIPANTS Observational study of women who were ascertained between 1937 and 2011 (median, 1999) and found to carry disease-associated BRCA1 or BRCA2 mutations. The international sample comprised 19,581 carriers of BRCA1 mutations and 11,900 carriers of BRCA2 mutations from 55 centers in 33 countries on 6 continents. We estimated hazard ratios for breast and ovarian cancer based on mutation type, function, and nucleotide position. We also estimated RHR, the ratio of breast vs ovarian cancer hazard ratios. A value of RHR greater than 1 indicated elevated breast cancer risk; a value of RHR less than 1 indicated elevated ovarian cancer risk. EXPOSURES Mutations of BRCA1 or BRCA2. MAIN OUTCOMES AND MEASURES Breast and ovarian cancer risks. RESULTS Among BRCA1 mutation carriers, 9052 women (46%) were diagnosed with breast cancer, 2317 (12%) with ovarian cancer, 1041 (5%) with breast and ovarian cancer, and 7171 (37%) without cancer. Among BRCA2 mutation carriers, 6180 women (52%) were diagnosed with breast cancer, 682 (6%) with ovarian cancer, 272 (2%) with breast and ovarian cancer, and 4766 (40%) without cancer. In BRCA1, we identified 3 breast cancer cluster regions (BCCRs) located at c.179 to c.505 (BCCR1; RHR = 1.46; 95% CI, 1.22-1.74; P = 2 × 10(-6)), c.4328 to c.4945 (BCCR2; RHR = 1.34; 95% CI, 1.01-1.78; P = .04), and c. 5261 to c.5563 (BCCR2', RHR = 1.38; 95% CI, 1.22-1.55; P = 6 × 10(-9)). We also identified an ovarian cancer cluster region (OCCR) from c.1380 to c.4062 (approximately exon 11) with RHR = 0.62 (95% CI, 0.56-0.70; P = 9 × 10(-17)). In BRCA2, we observed multiple BCCRs spanning c.1 to c.596 (BCCR1; RHR = 1.71; 95% CI, 1.06-2.78; P = .03), c.772 to c.1806 (BCCR1'; RHR = 1.63; 95% CI, 1.10-2.40; P = .01), and c.7394 to c.8904 (BCCR2; RHR = 2.31; 95% CI, 1.69-3.16; P = .00002). We also identified 3 OCCRs: the first (OCCR1) spanned c.3249 to c.5681 that was adjacent to c.5946delT (6174delT; RHR = 0.51; 95% CI, 0.44-0.60; P = 6 × 10(-17)). The second OCCR spanned c.6645 to c.7471 (OCCR2; RHR = 0.57; 95% CI, 0.41-0.80; P = .001). Mutations conferring nonsense-mediated decay were associated with differential breast or ovarian cancer risks and an earlier age of breast cancer diagnosis for both BRCA1 and BRCA2 mutation carriers. CONCLUSIONS AND RELEVANCE Breast and ovarian cancer risks varied by type and location of BRCA1/2 mutations. With appropriate validation, these data may have implications for risk assessment and cancer prevention decision making for carriers of BRCA1 and BRCA2 mutations. | Association of type and location of BRCA1 and BRCA2 mutations with risk of breast and ovarian cancer. |
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"28929": 0.77198725938797, "29515": 0.00875066313892603} | 9412420 | Mesenchymal stem cells (MSCs) commonly defined by in vitro functions have entered clinical application despite little definition of their function in residence. Here, we report genetic pulse-chase experiments that define osteoblastic cells as short-lived and nonreplicative, requiring replenishment from bone-marrow-derived, Mx1(+) stromal cells with "MSC" features. These cells respond to tissue stress and migrate to sites of injury, supplying new osteoblasts during fracture healing. Single cell transplantation yielded progeny that both preserve progenitor function and differentiate into osteoblasts, producing new bone. They are capable of local and systemic translocation and serial transplantation. While these cells meet current definitions of MSCs in vitro, they are osteolineage restricted in vivo in growing and adult animals. Therefore, bone-marrow-derived MSCs may be a heterogeneous population with the Mx1(+) population, representing a highly dynamic and stress responsive stem/progenitor cell population of fate-restricted potential that feeds the high cell replacement demands of the adult skeleton. | Endogenous bone marrow MSCs are dynamic, fate-restricted participants in bone maintenance and regeneration. |
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1.2129170894622803, "28667": 0.5871354341506958, "28727": 1.7593384981155396, "28873": 0.22626367211341858, "28986": 0.3283478021621704} | 9420732 | Cadherins and the immunoglobulin (Ig) proteins give rise to a multitude of surface receptors, which function as diverse cell adhesion molecules (CAMs) or signal-transducing receptors. These functions are often interdependent, and rely on a high degree of specificity in homophilic binding as well as heterophilic interactions. The Drosophila receptor Dscam is an exceptional example of homophilic binding specificity involved in a number of important biological processes, such as neural wiring and innate immunity. Combinatorial use of alternatively spliced Ig-domains enables the generation of an estimated 18,000 isoform-specific homophilic receptor pairs. Although isoform diversity of Dscam is unique to arthropods, recent genetic analysis of vertebrate DSCAM (Down Syndrome Cell Adhesion Molecule) genes has revealed an intriguing conservation of molecular functions underlying neural wiring. This review covers the multiple functions of Dscam across different species highlighting its remarkable versatility as well as its conserved basic functions in neural development. We discuss how an unprecedented expansion of complex alternative splicing has been uniquely employed by arthropods to generate diverse surface receptors, important for cell-cell communication, molecular self-recognition in neurons, and innate immune defenses. We end with a speculative hypothesis reconciling the striking differences in Dscam and DSCAM gene structures with their conserved functions in molecular recognition underlying neural circuit formation. | Dscam and DSCAM: complex genes in simple animals, complex animals yet simple genes. |
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| 9433958 | Although susceptibility of neurons in the brain to microbial infection is a major determinant of clinical outcome, little is known about the molecular factors governing this vulnerability. Here we show that two types of neurons from distinct brain regions showed differential permissivity to replication of several positive-stranded RNA viruses. Granule cell neurons of the cerebellum and cortical neurons from the cerebral cortex have unique innate immune programs that confer differential susceptibility to viral infection ex vivo and in vivo. By transducing cortical neurons with genes that were expressed more highly in granule cell neurons, we identified three interferon-stimulated genes (ISGs; Ifi27, Irg1 and Rsad2 (also known as Viperin)) that mediated the antiviral effects against different neurotropic viruses. Moreover, we found that the epigenetic state and microRNA (miRNA)-mediated regulation of ISGs correlates with enhanced antiviral response in granule cell neurons. Thus, neurons from evolutionarily distinct brain regions have unique innate immune signatures, which probably contribute to their relative permissiveness to infection. | Differential innate immune response programs in neuronal subtypes determine susceptibility to infection in the brain by positive stranded RNA viruses |
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0.0038986403960734606, "27404": 0.11865071207284927, "27885": 0.9052929878234863, "28136": 0.04767346754670143, "28329": 0.304147332906723, "28424": 0.15275461971759796, "29333": 0.07431721687316895, "29357": 0.07793712615966797, "29454": 0.32553088665008545} | 9440748 | BACKGROUND The major sites of obstruction in chronic obstructive pulmonary disease (COPD) are small airways (<2 mm in diameter). We wanted to determine whether there was a relationship between small-airway obstruction and emphysematous destruction in COPD. METHODS We used multidetector computed tomography (CT) to compare the number of airways measuring 2.0 to 2.5 mm in 78 patients who had various stages of COPD, as judged by scoring on the Global Initiative for Chronic Obstructive Lung Disease (GOLD) scale, in isolated lungs removed from patients with COPD who underwent lung transplantation, and in donor (control) lungs. MicroCT was used to measure the extent of emphysema (mean linear intercept), the number of terminal bronchioles per milliliter of lung volume, and the minimum diameters and cross-sectional areas of terminal bronchioles. RESULTS On multidetector CT, in samples from patients with COPD, as compared with control samples, the number of airways measuring 2.0 to 2.5 mm in diameter was reduced in patients with GOLD stage 1 disease (P=0.001), GOLD stage 2 disease (P=0.02), and GOLD stage 3 or 4 disease (P<0.001). MicroCT of isolated samples of lungs removed from patients with GOLD stage 4 disease showed a reduction of 81 to 99.7% in the total cross-sectional area of terminal bronchioles and a reduction of 72 to 89% in the number of terminal bronchioles (P<0.001). A comparison of the number of terminal bronchioles and dimensions at different levels of emphysematous destruction (i.e., an increasing value for the mean linear intercept) showed that the narrowing and loss of terminal bronchioles preceded emphysematous destruction in COPD (P<0.001). CONCLUSIONS These results show that narrowing and disappearance of small conducting airways before the onset of emphysematous destruction can explain the increased peripheral airway resistance reported in COPD. (Funded by the National Heart, Lung, and Blood Institute and others.). | Small-airway obstruction and emphysema in chronic obstructive pulmonary disease. |
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H2A.Z-containing nucleosomes are incorporated at most eukaryotic promoters. This incorporation is mediated by the conserved SWR1 complex, which replaces histone H2A in canonical nucleosomes with H2A.Z in an ATP-dependent manner. Here, we show that promoter-proximal nucleosomes are highly heterogeneous for H2A.Z in Saccharomyces cerevisiae, with substantial representation of nucleosomes containing one, two, or zero H2A.Z molecules. SWR1-catalyzed H2A.Z replacement in vitro occurs in a stepwise and unidirectional fashion, one H2A.Z-H2B dimer at a time, producing heterotypic nucleosomes as intermediates and homotypic H2A.Z nucleosomes as end products. The ATPase activity of SWR1 is specifically stimulated by H2A-containing nucleosomes without ensuing histone H2A eviction. Remarkably, further addition of free H2A.Z-H2B dimer leads to hyperstimulation of ATPase activity, eviction of nucleosomal H2A-H2B, and deposition of H2A.Z-H2B. These results suggest that the combination of H2A-containing nucleosome and free H2A.Z-H2B dimer acting as both effector and substrate for SWR1 governs the specificity and outcome of the replacement reaction. | Stepwise Histone Replacement by SWR1 Requires Dual Activation with Histone H2A.Z and Canonical Nucleosome |
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0.04394211992621422, "28892": 0.2223619967699051, "29129": 0.23710809648036957, "29297": 0.12384103983640671} | 9451684 | Budding yeast grown under continuous, nutrient-limited conditions exhibit robust, highly periodic cycles in the form of respiratory bursts. Microarray studies reveal that over half of the yeast genome is expressed periodically during these metabolic cycles. Genes encoding proteins having a common function exhibit similar temporal expression patterns, and genes specifying functions associated with energy and metabolism tend to be expressed with exceptionally robust periodicity. Essential cellular and metabolic events occur in synchrony with the metabolic cycle, demonstrating that key processes in a simple eukaryotic cell are compartmentalized in time. | Logic of the yeast metabolic cycle: temporal compartmentalization of cellular processes. |
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0.9333322048187256, "28788": 0.25088030099868774, "29290": 0.5376120805740356, "29458": 0.21687394380569458, "29533": 0.03925827145576477} | 9460704 | Differentiation therapy has emerged as a powerful way to target specific hematologic malignancies. One of the best examples is the use of all-trans retinoic acid (ATRA) in acute promyelocytic leukemia (APL), which has significantly improved the outcome for patients with this specific form of acute myeloid leukemia (AML). In considering how differentiation therapy could be used in other forms of AML, we predicted that compounds that induce terminal differentiation of megakaryocytes would be effective therapies for the megakaryocytic form of AML, named acute megakaryocytic leukemia (AMKL). We also speculated that such agents would reduce the burden of abnormal hematopoietic cells in primary myelofibrosis and alter the differentiation of megakaryocytes in myelodysplastic syndromes. Using a high-throughput chemical screening approach, we identified small molecules that promoted many features of terminal megakaryocyte differentiation, including the induction of polyploidization, the process by which cells accumulate DNA to 32N or greater. As the induction of polyploidization is an irreversible process, cells that enter this form of the cell cycle do not divide again. Thus, this would be an effective way to reduce the tumor burden. Clinical studies with polyploidy inducers, such as aurora kinase A inhibitors, are under way for a wide variety of malignancies, whereas trials specifically for AMKL and PMF are in development. This novel form of differentiation therapy may be clinically available in the not-too-distant future. Clin Cancer Res; 19(22); 6084-8. ©2013 AACR. | Molecular pathways: induction of polyploidy as a novel differentiation therapy for leukemia. |
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"23924": 0.27712854743003845, "24051": 0.08782484382390976, "24087": 0.36426326632499695, "24164": 0.7124901413917542, "24278": 0.012615402229130268, "24759": 0.5398913025856018, "25206": 0.09495500475168228, "25468": 1.4705350399017334, "25604": 0.03831886500120163, "25761": 0.3750596046447754, "26014": 0.6639154553413391, "26169": 0.14518201351165771, "26305": 0.23015019297599792, "26601": 0.06703783571720123, "26741": 0.0019512200960889459, "26989": 0.6181373596191406, "26994": 0.22704219818115234, "28227": 0.01934296265244484, "28522": 0.8845420479774475, "28765": 0.8074519634246826, "28828": 0.1710275560617447, "29125": 0.42608439922332764} | 9478135 | Point mutations of the transcription factor AML1 are associated with leukemogenesis in acute myeloblastic leukemia (AML). Internal tandem duplications (ITDs) in the juxtamembrane domain and mutations in the second tyrosine kinase domain of the Fms-like tyrosine kinase 3 (FLT3) gene represent the most frequent genetic alterations in AML. However, such mutations per se appear to be insufficient for leukemic transformation. To evaluate whether both AML1 and FLT3 mutations contribute to leukemogenesis, we analyzed mutations of these genes in AML M0 subtype in whom AML1 mutations were predominantly observed. Of 51 patients, eight showed a mutation in the Runt domain of the AML1 gene: one heterozygous missense mutation with normal function, five heterozygous frameshift mutations and two biallelic nonsense or frameshift mutations, resulting in haploinsufficiency or complete loss of the AML1 activities. On the other hand, a total of 10 of 49 patients examined had the FLT3 mutation. We detected the FLT3 mutation in five of eight (63%) patients with AML1 mutation, whereas five of 41 (12%) without AML1 mutation showed the FLT3 mutation (P=0.0055). These observations suggest that reduced AML1 activities predispose cells to the acquisition of the activating FLT3 mutation as a secondary event leading to full transformation in AML M0. | Dual mutations in the AML1 and FLT3 genes are associated with leukemogenesis in acute myeloblastic leukemia of the M0 subtype |
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"25030": 0.06246116757392883, "25086": 0.1677299439907074, "25354": 0.9761797785758972, "25409": 0.6170841455459595, "25468": 0.25845035910606384, "25502": 0.6228629946708679, "25644": 0.021256839856505394, "25746": 0.5139457583427429, "25950": 0.9783848524093628, "26224": 0.08064348995685577, "26402": 0.4617912769317627, "26534": 0.1485546976327896, "26572": 0.08782484382390976, "26651": 0.28670501708984375, "26773": 0.5027855634689331, "26835": 0.05046287178993225, "26963": 0.40285754203796387, "27009": 0.732405424118042, "27144": 0.39893341064453125, "27325": 0.34922540187835693, "27814": 0.21135559678077698, "27854": 0.1011524572968483, "27881": 0.40285754203796387, "28154": 0.04953393340110779, "28522": 0.05694137513637543, "28696": 0.1734936386346817, "28964": 0.8567397594451904, "29174": 0.012615402229130268} | 9483851 | p53 is a crucial tumour suppressor that responds to diverse stress signals by orchestrating specific cellular responses, including transient cell cycle arrest, cellular senescence and apoptosis, which are all processes associated with tumour suppression. However, recent studies have challenged the relative importance of these canonical cellular responses for p53-mediated tumour suppression and have highlighted roles for p53 in modulating other cellular processes, including metabolism, stem cell maintenance, invasion and metastasis, as well as communication within the tumour microenvironment. In this Opinion article, we discuss the roles of classical p53 functions, as well as emerging p53-regulated processes, in tumour suppression. | Unravelling mechanisms of p53-mediated tumour suppression |
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0.679875910282135, "27226": 1.2221657037734985, "27339": 0.04207121208310127, "27354": 0.47584590315818787, "27709": 1.070887804031372, "27711": 0.07341018319129944, "27854": 0.083342544734478, "28025": 0.08782484382390976, "28086": 0.02887592278420925, "28156": 0.23556606471538544, "28177": 0.2447827309370041, "28207": 0.04207121208310127, "28297": 0.07341018319129944, "28518": 0.010684899985790253, "28522": 1.1911962032318115, "28648": 0.18654440343379974, "29107": 0.2160874605178833, "29235": 0.1970241367816925, "29237": 0.013579257763922215, "29458": 0.841701865196228, "29480": 0.5540198087692261} | 9486930 | PURPOSE Glioblastomas are notorious for resistance to therapy, which has been attributed to DNA-repair proficiency, a multitude of deregulated molecular pathways, and, more recently, to the particular biologic behavior of tumor stem-like cells. Here, we aimed to identify molecular profiles specific for treatment resistance to the current standard of care of concomitant chemoradiotherapy with the alkylating agent temozolomide. PATIENTS AND METHODS Gene expression profiles of 80 glioblastomas were interrogated for associations with resistance to therapy. Patients were treated within clinical trials testing the addition of concomitant and adjuvant temozolomide to radiotherapy. RESULTS An expression signature dominated by HOX genes, which comprises Prominin-1 (CD133), emerged as a predictor for poor survival in patients treated with concomitant chemoradiotherapy (n = 42; hazard ratio = 2.69; 95% CI, 1.38 to 5.26; P = .004). This association could be validated in an independent data set. Provocatively, the HOX cluster was reminiscent of a "self-renewal" signature (P = .008; Gene Set Enrichment Analysis) recently characterized in a mouse leukemia model. The HOX signature and EGFR expression were independent prognostic factors in multivariate analysis, adjusted for the O-6-methylguanine-DNA methyltransferase (MGMT) methylation status, a known predictive factor for benefit from temozolomide, and age. Better outcome was associated with gene clusters characterizing features of tumor-host interaction including tumor vascularization and cell adhesion, and innate immune response. CONCLUSION This study provides first clinical evidence for the implication of a "glioma stem cell" or "self-renewal" phenotype in treatment resistance of glioblastoma. Biologic mechanisms identified here to be relevant for resistance will guide future targeted therapies and respective marker development for individualized treatment and patient selection. | Stem cell-related "self-renewal" signature and high epidermal growth factor receptor expression associated with resistance to concomitant chemoradiotherapy in glioblastoma. |
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0.28670501708984375, "26251": 0.18978065252304077, "26402": 0.5651806592941284, "26419": 0.08961215615272522, "26601": 0.23556606471538544, "26616": 0.3127557039260864, "26702": 0.02412080205976963, "27144": 0.5069117546081543, "27531": 0.26820653676986694, "27776": 0.04767346754670143, "28154": 0.0038986403960734606, "28517": 0.018384648486971855, "28518": 0.0606246218085289, "28911": 0.5860490798950195, "29107": 0.06612417846918106, "29191": 0.021256839856505394, "29458": 0.5483922958374023, "29490": 0.09761575609445572} | 9498458 | UNLABELLED Rociletinib is a third-generation EGFR inhibitor active in lung cancers with T790M, the gatekeeper mutation underlying most first-generation EGFR drug resistance. We biopsied patients at rociletinib progression to explore resistance mechanisms. Among 12 patients with T790M-positive cancers at rociletinib initiation, six had T790-wild-type rociletinib-resistant biopsies. Two T790-wild-type cancers underwent small cell lung cancer transformation; three T790M-positive cancers acquired EGFR amplification. We documented T790-wild-type and T790M-positive clones coexisting within a single pre-rociletinib biopsy. The pretreatment fraction of T790M-positive cells affected response to rociletinib. Longitudinal circulating tumor DNA (ctDNA) analysis revealed an increase in plasma EGFR-activating mutation, and T790M heralded rociletinib resistance in some patients, whereas in others the activating mutation increased but T790M remained suppressed. Together, these findings demonstrate the role of tumor heterogeneity when therapies targeting a singular resistance mechanism are used. To further improve outcomes, combination regimens that also target T790-wild-type clones are required. SIGNIFICANCE This report documents that half of T790M-positive EGFR-mutant lung cancers treated with rociletinib are T790-wild-type upon progression, suggesting that T790-wild-type clones can emerge as the dominant source of resistance. We show that tumor heterogeneity has important clinical implications and that plasma ctDNA analyses can sometimes predict emerging resistance mechanisms. | Heterogeneity Underlies the Emergence of EGFRT790 Wild-Type Clones Following Treatment of T790M-Positive Cancers with a Third-Generation EGFR Inhibitor. |
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Here, we demonstrate that a Foxp3 enhancer, conserved noncoding sequence 1 (CNS1), essential for pTreg but dispensable for tTreg cell generation, is present only in placental mammals. CNS1 is largely composed of mammalian-wide interspersed repeats (MIR) that have undergone retrotransposition during early mammalian radiation. During pregnancy, pTreg cells specific to a model paternal alloantigen were generated in a CNS1-dependent manner and accumulated in the placenta. Furthermore, when mated with allogeneic, but not syngeneic, males, CNS1-deficient females showed increased fetal resorption accompanied by increased immune cell infiltration and defective remodeling of spiral arteries. Our results suggest that, during evolution, a CNS1-dependent mechanism of extrathymic differentiation of Treg cells emerged in placental animals to enforce maternal-fetal tolerance. | Extrathymic Generation of Regulatory T Cells in Placental Mammals Mitigates Maternal-Fetal Conflict |
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advanced lung cancer whose tumors had developed resistance to the epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor (TKI) AZD9291. We first performed next-generation sequencing of cfDNA from seven subjects and detected an acquired EGFR C797S mutation in one; expression of this mutant EGFR construct in a cell line rendered it resistant to AZD9291. We then performed droplet digital PCR on serial cfDNA specimens collected from 15 AZD9291-treated subjects. All were positive for the T790M mutation before treatment, but upon developing AZD9291 resistance three molecular subtypes emerged: six cases acquired the C797S mutation, five cases maintained the T790M mutation but did not acquire the C797S mutation and four cases lost the T790M mutation despite the presence of the underlying EGFR activating mutation. Our findings provide insight into the diversity of mechanisms through which tumors acquire resistance to AZD9291 and highlight the need for therapies that are able to overcome resistance mediated by the EGFR C797S mutation. | Acquired EGFR C797S mutation mediates resistance to AZD9291 in non–small cell lung cancer harboring EGFR T790M |
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0.18167030811309814, "29490": 0.22626367211341858} | 9505448 | Activation of the mammalian Notch receptor after ligand binding relies on a succession of events including metalloprotease-cleavage, endocytosis, monoubiquitination, and eventually processing by the gamma-secretase, giving rise to a soluble, transcriptionally active molecule. The Notch1 receptor was proposed to be monoubiquitinated before its gamma-secretase cleavage; the targeted lysine has been localized to its submembrane domain. Investigating how this step might be regulated by a deubiquitinase (DUB) activity will provide new insight for understanding Notch receptor activation and downstream signaling. An immunofluorescence-based screening of an shRNA library allowed us to identify eIF3f, previously known as one of the subunits of the translation initiation factor eIF3, as a DUB targeting the activated Notch receptor. We show that eIF3f has an intrinsic DUB activity. Knocking down eIF3f leads to an accumulation of monoubiquitinated forms of activated Notch, an effect counteracted by murine WT eIF3f but not by a catalytically inactive mutant. We also show that eIF3f is recruited to activated Notch on endocytic vesicles by the putative E3 ubiquitin ligase Deltex1, which serves as a bridging factor. Finally, catalytically inactive forms of eIF3f as well as shRNAs targeting eIF3f repress Notch activation in a coculture assay, showing that eIF3f is a new positive regulator of the Notch pathway. Our results support two new and provocative conclusions: (1) The activated form of Notch needs to be deubiquitinated before being processed by the gamma-secretase activity and entering the nucleus, where it fulfills its transcriptional function. (2) The enzyme accounting for this deubiquitinase activity is eIF3f, known so far as a translation initiation factor. These data improve our knowledge of Notch signaling but also open new avenues of research on the Zomes family and the translation initiation factors. | The Translation Initiation Factor 3f (eIF3f) Exhibits a Deubiquitinase Activity Regulating Notch Activation |
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"25572": 0.9155091643333435, "25665": 0.010684899985790253, "25714": 0.37371641397476196, "25761": 0.18329764902591705, "26083": 0.05694137513637543, "26136": 0.9857001900672913, "26228": 0.034552380442619324, "26356": 1.0464962720870972, "26396": 0.07341018319129944, "26402": 0.8715548515319824, "26610": 0.7389566898345947, "26651": 0.0174254160374403, "26655": 0.33325836062431335, "26838": 0.1221139207482338, "27496": 1.0973093509674072, "27539": 0.2719337046146393, "27846": 0.5450005531311035, "27854": 0.1994270235300064, "28041": 0.10026945173740387, "28086": 0.0174254160374403, "28194": 0.817850649356842, "28691": 0.10379679501056671, "28758": 0.10379679501056671, "28817": 0.0058422754518687725, "29105": 0.7889899015426636, "29290": 0.6296497583389282, "29443": 1.0409941673278809, "29577": 0.6828403472900391} | 9507605 | The transition of cell–matrix adhesions from the initial punctate focal complexes into the mature elongated form, known as focal contacts, requires GTPase Rho activity. In particular, activation of myosin II–driven contractility by a Rho target known as Rho-associated kinase (ROCK) was shown to be essential for focal contact formation. To dissect the mechanism of Rho-dependent induction of focal contacts and to elucidate the role of cell contractility, we applied mechanical force to vinculin-containing dot-like adhesions at the cell edge using a micropipette. Local centripetal pulling led to local assembly and elongation of these structures and to their development into streak-like focal contacts, as revealed by the dynamics of green fluorescent protein–tagged vinculin or paxillin and interference reflection microscopy. Inhibition of Rho activity by C3 transferase suppressed this force-induced focal contact formation. However, constitutively active mutants of another Rho target, the formin homology protein mDia1 (Watanabe, N., T. Kato, A. Fujita, T. Ishizaki, and S. Narumiya. 1999. Nat. Cell Biol. 1:136–143), were sufficient to restore force-induced focal contact formation in C3 transferase-treated cells. Force-induced formation of the focal contacts still occurred in cells subjected to myosin II and ROCK inhibition. Thus, as long as mDia1 is active, external tension force bypasses the requirement for ROCK-mediated myosin II contractility in the induction of focal contacts. Our experiments show that integrin-containing focal complexes behave as individual mechanosensors exhibiting directional assembly in response to local force. | Focal contacts as mechanosensors: externally applied local mechanical force induces growth of focal contacts by an mDia1-dependent and ROCKindependent mechanism |
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"26524": 0.1734936386346817, "26773": 0.22079704701900482, "26906": 1.1153976917266846, "26982": 0.10026945173740387, "26994": 0.06154331564903259, "26996": 0.5800528526306152, "27032": 0.14686977863311768, "27142": 0.6176109313964844, "27226": 0.20739519596099854, "27531": 0.9635916948318481, "27570": 0.25467249751091003, "27768": 0.03266380727291107, "27815": 0.0770333781838417, "28054": 0.1602703034877777, "28086": 0.2659635543823242, "28156": 1.0116009712219238, "28283": 0.07159364968538284, "28467": 0.10818854719400406, "28621": 0.1905880719423294, "28637": 0.03360854089260101, "28667": 0.8366385698318481, "29172": 0.22079704701900482, "29336": 0.11343330889940262, "29384": 0.12986256182193756, "29516": 0.39367714524269104} | 9513785 | We previously reported that maternal protein restriction in rodents influenced the rate of growth in early life and ultimately affected longevity. Low birth weight caused by maternal protein restriction followed by catch-up growth (recuperated animals) was associated with shortened lifespan whereas protein restriction and slow growth during lactation (postnatal low protein: PLP animals) increased lifespan. We aim to explore the mechanistic basis by which these differences arise. Here we investigated effects of maternal diet on organ growth, metabolic parameters and the expression of insulin/IGF1 signalling proteins and Sirt1 in muscle of male mice at weaning. PLP mice which experienced protein restriction during lactation had lower fasting glucose (P = 0.038) and insulin levels (P = 0.046) suggesting improved insulin sensitivity. PLP mice had higher relative weights (adjusted by body weight) of brain (P = 0.0002) and thymus (P = 0.031) compared to controls suggesting that enhanced functional capacity of these two tissues is beneficial to longevity. They also had increased expression of insulin receptor substrate 1 (P = 0.021) and protein kinase C zeta (P = 0.046). Recuperated animals expressed decreased levels of many insulin signalling proteins including PI3 kinase subunits p85alpha (P = 0.018), p110beta (P = 0.048) and protein kinase C zeta (P = 0.006) which may predispose these animals to insulin resistance. Sirt1 protein expression was reduced in recuperated offspring. These observations suggest that maternal protein restriction can affect major metabolic pathways implicated in regulation of lifespan at a young age which may explain the impact of maternal diet on longevity. | Maternal Protein Restriction Affects Postnatal Growth and the Expression of Key Proteins Involved in Lifespan Regulation in Mice |
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"28723": 0.24171993136405945, "28767": 0.23092569410800934, "29101": 0.16276304423809052, "29299": 0.6254787445068359, "29347": 0.6634125709533691, "29458": 0.08782484382390976, "29516": 0.15693697333335876} | 9538708 | Recent studies report comparable psychosocial adaptation in children with or without a growth disorder. These findings may be due to a general lack of sensitive and specific techniques for analysing and comparing their respective qualities of life. In this study we present a new questionnaire for parents of short-statured children. We suggest both a qualitative and quantitative approach providing specific information about the relative extent of individual stress factors and sources of help. The parents of 442 children with growth retardation resulting from different aetiologies completed the questionnaire. Aprincipal component analysis of the scaled items revealed four dimensions of psychosocial adaptation: suffering, future anxieties, behavioural problems and coping efforts. The index of internal consistency reliability was sufficient for all scales. The comparison of two selected growth disorder groups (achondroplasia versus growth hormone deficiency) demonstrated growth disorder-specific but not very different profiles of psychosocial adaptation. The qualitative analysis revealed a shift in the stress factor patterns (achondroplasia, more physical restrictions). These findings give evidence for both the specificity and construct validity of the new instrument. Therefore, we may conclude that this questionnaire is a helpful method in attaining growth disorder-specific information about individual stress factors, resources and psychosocial adaptation. | ‘Short stature in children - a questionnaire for parents’: a new instrument for growth disorder-specific psychosocial adaptation in children |
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"28976": 0.10379679501056671, "29347": 0.8633513450622559, "29486": 0.3910386264324188} | 9539248 | Mosquito-borne viruses cause significant levels of morbidity and mortality in humans and domesticated animals. Maintenance of mosquito-borne viruses in nature requires a biological transmission cycle that involves alternating virus replication in a susceptible vertebrate and mosquito host. Although the vertebrate infection is acute and often associated with disease, continual transmission of these viruses in nature depends on the establishment of a persistent, nonpathogenic infection in the mosquito vector. An antiviral RNAi response has been shown to limit the replication of RNA viruses in flies. However, the importance of the RNAi pathway as an antiviral defense in mammals is unclear. Differences in the immune responses of mammals and mosquitoes may explain why these viruses are not generally associated with pathology in the invertebrate host. We identified virus-derived small interfering RNAs (viRNAs), 21 nt in length, in Aedes aegypti infected with the mosquito-borne virus, Sindbis (SINV). viRNAs had an asymmetric distribution that spanned the length of the SINV genome. To determine the role of viRNAs in controlling pathogenic potential, mosquitoes were infected with recombinant alphaviruses expressing suppressors of RNA silencing. Decreased survival was observed in mosquitoes in which the accumulation of viRNAs was suppressed. These results suggest that an exogenous siRNA pathway is essential to the survival of mosquitoes infected with alphaviruses and, thus, the maintenance of these viruses in nature. | Alphavirus-derived small RNAs modulate pathogenesis in disease vector mosquitoes. |
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Here we investigate the mechanism of RNAi inheritance in C. elegans. We show that exposure of animals to dsRNA results in the heritable expression of siRNAs and the heritable deposition of histone 3 lysine 9 methylation (H3K9me) marks in progeny. siRNAs are detectable before the appearance of H3K9me marks, suggesting that chromatin marks are not directly inherited but, rather, reestablished in inheriting progeny. Interestingly, H3K9me marks appear more prominently in inheriting progeny than in animals directly exposed to dsRNA, suggesting that germ-line transmission of silencing signals may enhance the efficiency of siRNA-directed H3K9me. Finally, we show that the nuclear RNAi (Nrde) pathway maintains heritable RNAi silencing in C. elegans. The Argonaute (Ago) NRDE-3 associates with heritable siRNAs and, acting in conjunction with the nuclear RNAi factors NRDE-1, NRDE-2, and NRDE-4, promotes siRNA expression in inheriting progeny. These results demonstrate that siRNA expression is heritable in C. elegans and define an RNAi pathway that promotes the maintenance of RNAi silencing and siRNA expression in the progeny of animals exposed to dsRNA. | Nuclear RNAi maintains heritable gene silencing in Caenorhabditis elegans. |
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"28297": 0.09406650811433792, "28321": 0.26296505331993103, "28667": 0.2622140049934387, "29458": 0.08782484382390976} | 9547722 | BACKGROUND Cancer survivors represent a growing population, heterogeneous in their need for medical care, psychosocial support, and practical assistance. To inform survivorship research and practice, this manuscript will describe the prevalent population of cancer survivors in terms of overall numbers and prevalence by cancer site and time since diagnosis. METHODS Incidence and survival data from 1975-2007 were obtained from the Surveillance, Epidemiology, and End Results Program and population projections from the United States Census Bureau. Cancer prevalence for 2012 and beyond was estimated using the Prevalence Incidence Approach Model, assuming constant future incidence and survival trends but dynamic projections of the U.S. population. RESULTS As of January 1, 2012, approximately 13.7 million cancer survivors were living in the United States with prevalence projected to approach 18 million by 2022. Sixty-four percent of this population have survived 5 years or more; 40% have survived 10 years or more; and 15% have survived 20 years or more after diagnosis. Over the next decade, the number of people who have lived 5 years or more after their cancer diagnosis is projected to increase approximately 37% to 11.9 million. CONCLUSIONS A coordinated agenda for research and practice is needed to address cancer survivors' long-term medical, psychosocial, and practical needs across the survivorship trajectory. IMPACT Prevalence estimates for cancer survivors across the survivorship trajectory will inform the national research agenda as well as future projections about the health service needs of this population. | Cancer survivors in the United States: prevalence across the survivorship trajectory and implications for care. |
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"28828": 0.6400018334388733, "28829": 0.43875885009765625, "28868": 0.058784693479537964, "28927": 0.1718502640724182, "29206": 0.2160874605178833, "29238": 0.2561853528022766, "29411": 0.2954642176628113} | 9548440 | Trisomic and monosomic (aneuploid) embryos account for at least 10% of human pregnancies and, for women nearing the end of their reproductive lifespan, the incidence may exceed 50%. The errors that lead to aneuploidy almost always occur in the oocyte but, despite intensive investigation, the underlying molecular basis has remained elusive. Recent studies of humans and model organisms have shed new light on the complexity of meiotic defects, providing evidence that the age-related increase in errors in the human female is not attributable to a single factor but to an interplay between unique features of oogenesis and a host of endogenous and exogenous factors. | Human aneuploidy: mechanisms and new insights into an age-old problem |
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"23216": 0.1677299439907074, "23247": 0.1064341589808464, "23253": 0.03925827145576477, "23737": 0.1946154683828354, "24019": 0.11691460013389587, "24226": 0.013579257763922215, "24454": 0.32270604372024536, "24528": 0.3084607720375061, "24587": 0.13414156436920166, "25324": 0.03360854089260101, "25499": 0.8143964409828186, "26083": 1.3243566751480103, "26243": 0.5301685929298401, "26296": 0.5696102976799011, "26585": 1.0094679594039917, "26781": 1.0986123085021973, "26838": 0.0913962796330452, "26950": 0.39367714524269104, "27321": 0.06429435312747955, "27330": 0.05786345899105072, "27715": 0.14518201351165771, "27894": 0.07612881064414978, "27920": 1.3295379877090454, "28086": 0.5685047507286072, "28788": 0.11865071207284927, "29180": 0.30558720231056213, "29217": 0.0019512200960889459, "29290": 0.2696990668773651, "29371": 0.13414156436920166} | 9550981 | The adult Drosophila hindgut was recently reported to contain active, tissue-replenishing stem cells, like those of the midgut, but located within an anterior ring so as to comprise a single giant crypt. In contrast to this view, we observed no active stem cells and little cell turnover in adult hindgut tissue based on clonal marking and BrdU incorporation studies. Again contradicting the previous proposal, we showed that the adult hindgut is not generated by anterior stem cells during larval/pupal development. However, severe tissue damage within the hindgut elicits cell proliferation within a ring of putative quiescent stem cells at the anterior of the pylorus. Thus, the hindgut does not provide a model of tissue maintenance by constitutively active stem cells, but has great potential to illuminate mechanisms of stress-induced tissue repair. | The Drosophila hindgut lacks constitutively active adult stem cells but proliferates in response to tissue damage. |
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0.29473719000816345, "26780": 0.4002431631088257, "26786": 0.757441520690918, "26876": 0.7076893448829651, "26886": 0.0038986403960734606, "26915": 0.8941729068756104, "27651": 0.29036402702331543, "27830": 0.24325250089168549, "27989": 0.07612881064414978, "28227": 0.6588751673698425, "28228": 0.18004031479358673, "28268": 0.22704219818115234, "28309": 0.1873544454574585, "28403": 0.5267143249511719, "28613": 0.8829278349876404, "28689": 1.2129170894622803, "28835": 0.055094651877880096, "28879": 0.35334911942481995, "28929": 0.9958525896072388, "29125": 0.9493325352668762, "29172": 0.22157983481884003, "29235": 0.22392450273036957, "29477": 0.8004589080810547, "29491": 0.036437395960092545, "29514": 0.33325836062431335, "29536": 0.3588210940361023, "29610": 1.0688776969909668} | 9555784 | INTRODUCTION Low vitamin D (VD) is associated with secondary hyperparathyroidism and both contribute to deleterious consequences (reduced bone mineral density (BMD), risk of fractures and falls). OBJECTIVE To study the VD status and biological correlates in a group of postmenopausal women. MATERIAL AND METHODS We studied 123 postmenopausal women evaluated in the C.I.Parhon National Institute of Endocrinology, the Pituitary and Neuroendocrine Diseases department. All cases had been reffered for the evaluation of BMD by the general practitioner. The evaluation included serum measurements of total and ionised calcium, phosphorus, alkaline phosphatase (ALP), 25 hydroxi vitaminD (25OHD), parathyroid hormone (PTH), osteocalcin, betacrosslaps. Central DXA osteodensitometry was performed. RESULTS 91.9% of cases had 25OHD serum levels below 30 ng/ml (74.8% had VD deficiency, 17.1% VD insufficiency). Only 8.1% had sufficient VD levels. A history of fragility fractures was present in 45.83% of the osteoporotic patients, 27.27% of the osteopenic ones and 15.15% of the women with normal BMD. 32 women (26%) were on VD supplementation at the time of evaluation. Among these subjects, the 25OHD level was significantly higher in those with prior fragility fractures (p=0.018) and osteoporosis (p=0.008). 25OHD concentration negatively correlated with PTH, alkaline phosphatase (ALP) and osteocalcin. The bone markers evaluated had a significant inverse correlation with the radius BMD, T and Z scores (p=0.004). 27.17% of the cases with VD deficiency had secondary hyperparathyroidism. The 25OHD concentration was significantly lower in these cases (p=0.000). CONCLUSIONS VD insufficiency is widely prevalent but still under-recognized and under-treated, possibly leading to secondary hyperparathyroidism. The compliance to VD supplementation is lower in subjects without osteoporosis or fragility fractures. Primary prevention measures should be more actively implemented. | Vitamin d deficiency in postmenopausal women - biological correlates. |
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0.09228714555501938, "27881": 0.1685553640127182, "27896": 0.2954642176628113, "28032": 0.8941729068756104, "28207": 0.10379679501056671, "28522": 0.16607704758644104, "28636": 0.40285754203796387, "28756": 0.11604541540145874, "28788": 0.09495500475168228, "28815": 0.010684899985790253, "28873": 0.23479416966438293, "29458": 0.5318912267684937} | 9558539 | Cancer stem cells drive tumor formation and metastasis, but how they acquire metastatic traits is not well understood. Here, we show that all colorectal cancer stem cells (CR-CSCs) express CD44v6, which is required for their migration and generation of metastatic tumors. CD44v6 expression is low in primary tumors but demarcated clonogenic CR-CSC populations. Cytokines hepatocyte growth factor (HGF), osteopontin (OPN), and stromal-derived factor 1α (SDF-1), secreted from tumor associated cells, increase CD44v6 expression in CR-CSCs by activating the Wnt/β-catenin pathway, which promotes migration and metastasis. CD44v6(-) progenitor cells do not give rise to metastatic lesions but, when treated with cytokines, acquire CD44v6 expression and metastatic capacity. Importantly, phosphatidylinositol 3-kinase (PI3K) inhibition selectively killed CD44v6 CR-CSCs and reduced metastatic growth. In patient cohorts, low levels of CD44v6 predict increased probability of survival. Thus, the metastatic process in colorectal cancer is initiated by CSCs through the expression of CD44v6, which is both a functional biomarker and therapeutic target. | CD44v6 is a marker of constitutive and reprogrammed cancer stem cells driving colon cancer metastasis. |
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"28696": 0.10818854719400406, "28767": 0.12642613053321838, "28788": 0.1602703034877777, "28790": 0.09406650811433792, "28927": 0.20739519596099854, "28964": 1.468738079071045, "29129": 0.04394211992621422, "29139": 0.04207121208310127, "29172": 0.18654440343379974, "29206": 0.08603433519601822, "29320": 0.39762192964553833, "29516": 0.1401015669107437, "29595": 0.09850110858678818} | 9559146 | Cells from organisms with renewable tissues can permanently withdraw from the cell cycle in response to diverse stress, including dysfunctional telomeres, DNA damage, strong mitogenic signals, and disrupted chromatin. This response, termed cellular senescence, is controlled by the p53 and RB tumor suppressor proteins and constitutes a potent anticancer mechanism. Nonetheless, senescent cells acquire phenotypic changes that may contribute to aging and certain age-related diseases, including late-life cancer. Thus, the senescence response may be antagonistically pleiotropic, promoting early-life survival by curtailing the development of cancer but eventually limiting longevity as dysfunctional senescent cells accumulate. | Senescent Cells, Tumor Suppression, and Organismal Aging: Good Citizens, Bad Neighbors |
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| 9580772 | A fundamental goal in biology is to determine how cellular organization is coupled to function. To achieve this goal, a better understanding of organelle composition and structure is needed. Although visualization of cellular organelles using fluorescence or electron microscopy (EM) has become a common tool for the cell biologist, recent advances are providing a clearer picture of the cell than ever before. In particular, advanced light-microscopy techniques are achieving resolutions below the diffraction limit and EM tomography provides high-resolution three-dimensional (3D) images of cellular structures. The ability to perform both fluorescence and electron microscopy on the same sample (correlative light and electron microscopy, CLEM) makes it possible to identify where a fluorescently labeled protein is located with respect to organelle structures visualized by EM. Here, we review the current state of the art in 3D biological imaging techniques with a focus on recent advances in electron microscopy and fluorescence super-resolution techniques. | Advances in high-resolution imaging--techniques for three-dimensional imaging of cellular structures. |
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"29458": 0.6280876994132996} | 9588931 | Vascular calcification is a strong independent predictor of increased cardiovascular morbidity and mortality and has a high prevalence among patients with chronic kidney disease. The present study investigated the effects of quercetin on vascular calcification caused by oxidative stress and abnormal mitochondrial dynamics both in vitro and in vivo. Calcifying vascular smooth muscle cells (VSMCs) treated with inorganic phosphate (Pi) exhibited mitochondrial dysfunction, as demonstrated by decreased mitochondrial potential and ATP production. Disruption of mitochondrial structural integrity was also observed in a rat model of adenine-induced aortic calcification. Increased production of reactive oxygen species, enhanced expression and phosphorylation of Drp1, and excessive mitochondrial fragmentation were also observed in Pi-treated VSMCs. These effects were accompanied by mitochondria-dependent apoptotic events, including release of cytochrome c from the mitochondria into the cytosol and subsequent activation of caspase-3. Quercetin was shown to block Pi-induced apoptosis and calcification of VSMCs by inhibiting oxidative stress and decreasing mitochondrial fission by inhibiting the expression and phosphorylation of Drp1. Quercetin also significantly ameliorated adenine-induced aortic calcification in rats. In summary, our findings suggest that quercetin attenuates calcification by reducing apoptosis of VSMCs by blocking oxidative stress and inhibiting mitochondrial fission. | Quercetin attenuates vascular calcification by inhibiting oxidative stress and mitochondrial fission. |
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0.7182208299636841, "24002": 0.053244512528181076, "24054": 0.1229778528213501, "24093": 0.5512100458145142, "24171": 0.6107416749000549, "24187": 0.175953671336174, "24278": 0.01934296265244484, "24345": 0.8534175157546997, "24394": 0.15860503911972046, "24442": 0.12728634476661682, "24501": 0.4425300657749176, "25407": 0.2034190446138382, "25430": 0.9515975713729858, "25765": 0.2969166338443756, "26013": 0.8550800085067749, "26288": 0.010684899985790253, "26475": 0.8281423449516296, "26572": 0.10906458646059036, "26632": 0.6729245185852051, "26835": 0.6275664567947388, "26927": 0.37707099318504333, "27072": 1.1894142627716064, "27287": 0.043007105588912964, "27354": 0.11865071207284927, "27781": 0.11865071207284927, "27790": 0.12642613053321838, "27854": 1.0546929836273193, "28389": 0.1602703034877777, "28873": 0.3676496744155884, "28896": 1.2152372598648071} | 9591368 | The porcine reproductive and respiratory syndrome virus (PRRSV) is a major threat to swine health worldwide and is considered the most significant viral disease in the swine industry today. In past years, studies on the entry of the virus into its host cell have led to the identification of a number of essential virus receptors and entry mediators. However, viral counterparts for these molecules have remained elusive and this has made rational development of new generation vaccines impossible. The main objective of this study was to identify the viral counterparts for sialoadhesin, a crucial PRRSV receptor on macrophages. For this purpose, a soluble form of sialoadhesin was constructed and validated. The soluble sialoadhesin could bind PRRSV in a sialic acid-dependent manner and could neutralize PRRSV infection of macrophages, thereby confirming the role of sialoadhesin as an essential PRRSV receptor on macrophages. Although sialic acids are present on the GP(3), GP(4) and GP(5) envelope glycoproteins, only the M/GP(5) glycoprotein complex of PRRSV was identified as a ligand for sialoadhesin. The interaction was found to be dependent on the sialic acid binding capacity of sialoadhesin and on the presence of sialic acids on GP(5). These findings not only contribute to a better understanding of PRRSV biology, but the knowledge and tools generated in this study also hold the key to the development of a new generation of PRRSV vaccines. | The M/GP5 Glycoprotein Complex of Porcine Reproductive and Respiratory Syndrome Virus Binds the Sialoadhesin Receptor in a Sialic Acid-Dependent Manner |
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Although site-specific recombination-based cloning systems, such as Gateway cloning technology, are extremely useful for efficient transfer of DNA fragments into multiple destination vectors, the two-step cloning process is time consuming and expensive. Here, we report a zero background TA cloning system that provides simple and high-efficiency direct cloning of PCR-amplified DNA fragments with almost no self-ligation. The improved T-vector system takes advantage of the restriction enzyme XcmI to generate a T-overhang after digestion and the negative selection marker gene ccdB to eliminate the self-ligation background after transformation. We demonstrate the feasibility and flexibility of the technology by developing a set of transient and stable transformation vectors for constitutive gene expression, gene silencing, protein tagging, protein subcellular localization detection, and promoter fragment activity analysis in plants. Because the system can be easily adapted for developing specialized expression vectors for other organisms, zero background TA provides a general, cost-efficient, and high-throughput platform that complements the Gateway cloning system for gene cloning and functional genomics. | A versatile zero background T-vector system for gene cloning and functional genomics. |
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"29107": 0.013579257763922215, "29206": 0.10818854719400406, "29278": 0.0009760859538801014, "29290": 0.4914994537830353, "29393": 0.3723714053630829, "29514": 0.20977331697940826, "29610": 0.26146242022514343} | 9600826 | Angiogenesis and cancer invasiveness greatly contribute to cancer malignancy. Arf6 and its effector, AMAP1, are frequently overexpressed in breast cancer, and constitute a central pathway to induce the invasion and metastasis. In this pathway, Arf6 is activated by EGFR via GEP100. Arf6 is highly expressed also in human umbilical vein endothelial cells (HUVECs) and is implicated in angiogenesis. Here, we found that HUVECs also highly express AMAP1, and that vascular endothelial growth factor receptor-2 (VEGFR2) recruits GEP100 to activate Arf6. AMAP1 functions by binding to cortactin in cancer invasion and metastasis. We demonstrate that the same GEP100-Arf6-AMAP1-cortactin pathway is essential for angiogenesis activities, including cell migration and tubular formation, as well as for the enhancement of cell permeability and VE-cadherin endocytosis of VEGF-stimulated HUVECs. Components of this pathway are highly expressed in pathologic angiogenesis, and blocking of this pathway effectively inhibits VEGF- or tumor-induced angiogenesis and choroidal neovascularization. The GEP100-Arf6-AMAP1-cortactin pathway, activated by receptor tyrosine kinases, appears to be common in angiogenesis and cancer invasion and metastasis, and provides their new therapeutic targets. | GEP100-Arf6-AMAP1-Cortactin Pathway Frequently Used in Cancer Invasion Is Activated by VEGFR2 to Promote Angiogenesis |
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0.0019512200960889459, "29299": 0.45251765847206116, "29490": 0.35334911942481995} | 9604301 | UNLABELLED Cryptococcosis is a multifaceted fungal infection with variable clinical presentation and outcome. As in many infectious diseases, this variability is commonly assigned to host factors. To investigate whether the diversity of Cryptococcus neoformans clinical (ClinCn) isolates influences the interaction with host cells and the clinical outcome, we developed and validated new quantitative assays using flow cytometry and J774 macrophages. The phenotype of ClinCn-macrophage interactions was determined for 54 ClinCn isolates recovered from cerebrospinal fluids (CSF) from 54 unrelated patients, based on phagocytic index (PI) and 2-h and 48-h intracellular proliferation indexes (IPH2 and IPH48, respectively). Their phenotypes were highly variable. Isolates harboring low PI/low IPH2 and high PI/high IPH2 values were associated with nonsterilization of CSF at week 2 and death at month 3, respectively. A subset of 9 ClinCn isolates with different phenotypes exhibited variable virulence in mice and displayed intramacrophagic expression levels of the LAC1, APP1, VAD1, IPC1, PLB1, and COX1 genes that were highly variable among the isolates and correlated with IPH48. Variation in the expression of virulence factors is thus shown here to depend on not only experimental conditions but also fungal background. These results suggest that, in addition to host factors, the patient's outcome can be related to fungal determinants. Deciphering the molecular events involved in C. neoformans fate inside host cells is crucial for our understanding of cryptococcosis pathogenesis. IMPORTANCE Cryptococcus neoformans is a life-threatening human fungal pathogen that is responsible for an estimated 1 million cases of meningitis/year, predominantly in HIV-infected patients. The diversity of infecting isolates is well established, as is the importance of the host factors. Interaction with macrophages is a major step in cryptococcosis pathogenesis. How the diversity of clinical isolates influences macrophages' interactions and impacts cryptococcosis outcome in humans remains to be elucidated. Using new assays, we uncovered how yeast-macrophage interactions were highly variable among clinical isolates and found an association between specific behaviors and cryptococcosis outcome. In addition, gene expression of some virulence factors and intracellular proliferation were correlated. While many studies have established that virulence factors can be differentially expressed as a function of experimental conditions, our study demonstrates that, under the same experimental conditions, clinical isolates behaved differently, a diversity that could participate in the variable outcome of infection in humans. | Dynamics of Cryptococcus neoformans-Macrophage Interactions Reveal that Fungal Background Influences Outcome during Cryptococcal Meningoencephalitis in Humans |
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"27144": 0.08961215615272522, "27531": 0.9842413663864136, "27854": 0.23092569410800934, "27896": 0.052318159490823746, "28032": 0.822151780128479, "28086": 0.0354953333735466, "28553": 0.5450005531311035, "28696": 0.09228714555501938, "28817": 0.8893690705299377, "28848": 0.9515975713729858, "29206": 0.9958525896072388, "29290": 0.29619070887565613, "29516": 0.5021947622299194, "29537": 1.0250049829483032} | 9612317 | The angiopoietin-Tie2 system in endothelial cells is an important regulator of vasculogenesis and vascular integrity. High levels of angiopoietin-2 (Ang2) mRNA are observed in vascular activation during tumorigenesis. Although Ang2 is known to be a naturally occurring antagonist of angiopoietin-1 (Ang1) in vivo, the exact function of Ang2 itself is not known. Here, we found that a high concentration of Ang2 (800 ng/ml) acts as an apoptosis survival factor for endothelial cells during serum deprivation apoptosis. The survival effect of high concentration Ang2 was blocked by pre-treatment with soluble Tie2 receptor and the PI 3′-kinase-specific inhibitors, wortmannin and LY294002. Accordingly, 800 ng/ml of Ang2 induced phosphorylation of Tie2, the p85 subunit of phosphatidylinositol 3′-kinase (PI 3′-kinase), and serine-threonine kinase Akt at Ser473 in the human umbilical vein endothelial cells; lower concentrations of Ang2 (50–400 ng/ml) did not produce notable effects. These findings indicate that at high concentrations, Ang2, like Ang1, can be an apoptosis survival factor for endothelial cells through the activation of the Tie2 receptor, PI 3′-kinase and Akt, and thus may be a positive regulator of tumor angiogenesis. | Angiopoietin-2 at high concentration can enhance endothelial cell survival through the phosphatidylinositol 3′-kinase/Akt signal transduction pathway |
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0.14939609169960022, "26773": 0.6664261221885681, "26775": 0.11256109178066254, "26835": 0.8756314516067505, "27099": 0.46117570996284485, "27441": 1.1994705200195312, "27641": 0.01934296265244484, "27781": 0.055094651877880096, "27833": 0.0797421783208847, "27854": 0.2822965085506439, "28156": 0.03831886500120163, "28286": 0.7592713832855225, "28691": 0.026976587250828743, "28696": 0.06429435312747955, "28873": 0.1808556467294693, "28991": 1.0492360591888428, "29098": 0.7305257320404053, "29110": 0.9240728616714478, "29170": 0.1889725625514984, "29290": 0.5313173532485962, "29295": 0.2105647772550583} | 9614443 | The anti-inflammatory eicosanoid lipoxin A(4) (LXA(4)), aspirin-triggered 15-epi-LXA(4), and their stable analogs down-regulate IL-8 secretion and subsequent recruitment of neutrophils by intestinal epithelia. In an effort to elucidate the mechanism by which these lipid mediators modulate cellular proinflammatory programs, we surveyed global epithelial gene expression using cDNA microarrays. LXA(4) analog alone did not significantly affect expression of any of the >7000 genes analyzed. However, LXA(4) analog pretreatment attenuated induction of approximately 50% of the 125 genes up-regulated in response to the gastroenteritis-causing pathogen Salmonella typhimurium. A major subset of genes whose induction was reduced by LXA(4) analog pretreatment is regulated by NF-kappaB, suggesting that LXA(4) analog was influencing the activity of this transcription factor. Nanomolar concentrations of LXA(4) analog reduced NF-kappaB-mediated transcriptional activation in a LXA(4) receptor-dependent manner and inhibited induced degradation of IkappaBalpha. LXA(4) analog did not affect earlier stimulus-induced signaling events that lead to IkappaBalpha degradation, such as S. typhimurium-induced epithelial Ca(2+) mobilization or TNF-alpha-induced phosphorylation of IkappaBalpha. To establish the in vivo relevance of these findings, we examined whether LXA(4) analogs could affect intestinal inflammation in vivo using the mouse model of DSS-induced inflammatory colitis. Oral administration of LXA(4) analog (15-epi-16-para-fluoro-phenoxy-LXA(4), 10 microg/day) significantly reduced the weight loss, hematochezia, and mortality that characterize DSS colitis. Thus, LXA(4) analog-mediated down-regulation of proinflammatory gene expression via inhibition of the NF-kappaB pathway can be therapeutic for diseases characterized by mucosal inflammation. | Lipoxin a4 analogs attenuate induction of intestinal epithelial proinflammatory gene expression and reduce the severity of dextran sodium sulfate-induced colitis. |
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"27204": 0.013579257763922215, "27354": 0.16359257698059082, "27360": 0.1905880719423294, "27572": 0.018384648486971855, "27833": 1.390192985534668, "27896": 0.3070250153541565, "28041": 0.013579257763922215, "28093": 1.0464962720870972, "28353": 0.15023678541183472, "28517": 0.34370049834251404, "28648": 0.045809537172317505, "28691": 0.2539152204990387, "28696": 0.04207121208310127, "28739": 0.10379679501056671, "28767": 0.021256839856505394, "28774": 0.8748174905776978, "28879": 0.006812678650021553, "29076": 0.8442239761352539, "29295": 0.0038986403960734606, "29299": 0.43812891840934753, "29336": 0.04394211992621422, "29458": 0.4914994537830353} | 9617381 | OBJECTIVE To evaluate long-term prognostic effect of serum noncholesterol sterols, including plant sterols, in middle-aged men with high cardiovascular disease (CVD) risk, without statins at baseline. METHODS This was a prospective study of 232 men (mean age 60 years) at high risk of CVD in 1985-1986. Most were hypercholesterolemic, 29 (12%) had a history of CVD or cancer, 6 (3%) had diabetes, and 46 (20%) had metabolic syndrome (MS). Measured noncholesterol sterols (expressed as absolute concentrations or ratios to serum cholesterol to standardize for cholesterol concentrations) included lathosterol and desmosterol (reflect cholesterol synthesis), and plant sterols (campesterol and sitosterol) and cholestanol (reflect cholesterol absorption). Main outcome measure was total mortality. RESULTS At baseline, markers of cholesterol synthesis and absorption showed expected inverse associations. During the 22-year follow-up 101 men (43%) died. At baseline, nonsurvivors smoked more, exercised less and had more components of MS (although not filling strict criteria), whereas traditional risk factors of CVD were not significantly different. Of the noncholesterol sterols (either absolute or ratio), only sitosterol was significantly higher in survivors than in nonsurvivors (P=0.02). In multivariable analyses, highest sitosterol-to-cholesterol tertile was associated with significantly lower mortality risk (HR 0.51, 95% CI 0.30-0.87) as compared to lowest tertile. Other associations were nonsignificant, although a "global" index of cholesterol metabolism (desmosterol-to-sitosterol ratio) suggested higher cholesterol synthesis and lower absorption to be associated with higher total and CVD mortality. CONCLUSION Higher serum plant sterol levels in middle-aged men predicted lower long-term mortality risk, possibly reflecting an association between higher synthesis/lower absorption of cholesterol and mortality. | Serum plant and other noncholesterol sterols, cholesterol metabolism and 22-year mortality among middle-aged men. |
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1.0403043031692505, "27065": 0.12384103983640671, "27108": 0.8707374930381775, "27159": 0.6533012986183167, "27354": 0.09050461649894714, "27480": 1.1882244348526, "27531": 0.022212404757738113, "27697": 0.1212492436170578, "27790": 0.026025565341114998, "27921": 0.9131608605384827, "27989": 0.055094651877880096, "28093": 0.13243216276168823, "28155": 0.13670019805431366, "28295": 0.4891071021556854, "28311": 0.4926934838294983, "28353": 0.13157635927200317, "28685": 0.06886265426874161, "28723": 1.2942990064620972, "28828": 0.151916041970253, "28829": 0.3005385100841522, "28965": 0.16359257698059082, "29361": 0.06886265426874161} | 9622258 | RATIONALE Hypoplastic left heart syndrome (HLHS) remains a lethal congenital cardiac defect. Recent studies have suggested that intracoronary administration of autologous cardiosphere-derived cells (CDCs) may improve ventricular function. OBJECTIVE The aim of this study was to test whether intracoronary delivery of CDCs is feasible and safe in patients with hypoplastic left heart syndrome. METHODS AND RESULTS Between January 5, 2011, and January 16, 2012, 14 patients (1.8±1.5 years) were prospectively assigned to receive intracoronary infusion of autologous CDCs 33.4±8.1 days after staged procedures (n=7), followed by 7 controls with standard palliation alone. The primary end point was to assess the safety, and the secondary end point included the preliminary efficacy to verify the right ventricular ejection fraction improvements between baseline and 3 months. Manufacturing and intracoronary delivery of CDCs were feasible, and no serious adverse events were reported within the 18-month follow-up. Patients treated with CDCs showed right ventricular ejection fraction improvement from baseline to 3-month follow-up (46.9%±4.6% to 52.1%±2.4%; P=0.008). Compared with controls at 18 months, cardiac MRI analysis of CDC-treated patients showed a higher right ventricular ejection fraction (31.5%±6.8% versus 40.4%±7.6%; P=0.049), improved somatic growth (P=0.0005), reduced heart failure status (P=0.003), and lower incidence of coil occlusion for collaterals (P=0.007). CONCLUSIONS Intracoronary infusion of autologous CDCs seems to be feasible and safe in children with hypoplastic left heart syndrome after staged surgery. Large phase 2 trials are warranted to examine the potential effects of cardiac function improvements and the long-term benefits of clinical outcomes. CLINICAL TRIAL REGISTRATION URL http://www.clinicaltrials.gov. Unique identifier: NCT01273857. | Intracoronary autologous cardiac progenitor cell transfer in patients with hypoplastic left heart syndrome: the TICAP prospective phase 1 controlled trial. |
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"26835": 0.13071982562541962, "27011": 0.846739649772644, "27166": 0.05046287178993225, "27179": 0.1946154683828354, "27258": 0.0797421783208847, "27312": 0.2622140049934387, "27348": 0.0058422754518687725, "27404": 0.6270449161529541, "27480": 0.0058422754518687725, "27781": 0.5455666780471802, "28024": 0.03266380727291107, "28086": 0.1221139207482338, "28177": 0.011650617234408855, "28252": 0.3601844012737274, "28664": 0.009718249551951885, "28727": 0.04860413447022438, "28837": 0.151916041970253, "28847": 0.9827804565429688, "29105": 0.38374659419059753, "29145": 1.178053855895996} | 9629682 | The field of macro-imaging has grown considerably with the appearance of innovative clearing methods and confocal microscopes with lasers capable of penetrating increasing tissue depths. The ability to visualize and model the growth of whole organs as they develop from birth, or with manipulation, disease or injury, provides new ways of thinking about development, tissue-wide signaling, and cell-to-cell interactions. The zebrafish (Danio rerio) has ascended from a predominantly developmental model to a leading adult model of tissue regeneration. The unmatched neurogenic and regenerative capacity of the mature central nervous system, in particular, has received much attention, however tools to interrogate the adult brain are sparse. At present there exists no straightforward methods of visualizing changes in the whole adult brain in 3-dimensions (3-D) to examine systemic patterns of cell proliferation or cell populations of interest under physiological, injury, or diseased conditions. The method presented here is the first of its kind to offer an efficient step-by-step pipeline from intraperitoneal injections of the proliferative marker, 5-ethynyl-2'-deoxyuridine (EdU), to whole brain labeling, to a final embedded and cleared brain sample suitable for 3-D imaging using optical projection tomography (OPT). Moreover, this method allows potential for imaging GFP-reporter lines and cell-specific antibodies in the presence or absence of EdU. The small size of the adult zebrafish brain, the highly consistent degree of EdU labeling, and the use of basic clearing agents, benzyl benzoate, and benzyl alcohol, makes this method highly tractable for most laboratories interested in understanding the vertebrate central nervous system in health and disease. Post-processing of OPT-imaged adult zebrafish brains injected with EdU illustrate that proliferative patterns in EdU can readily be observed and analyzed using IMARIS and/or FIJI/IMAGEJ software. This protocol will be a valuable tool to unlock new ways of understanding systemic patterns in cell proliferation in the healthy and injured brain, brain-wide cellular interactions, stem cell niche development, and changes in brain morphology. | A Whole Brain Staining, Embedding, and Clearing Pipeline for Adult Zebrafish to Visualize Cell Proliferation and Morphology in 3-Dimensions |
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Overexpression of the cardiac transcription factors Gata4, Mef2c, and Tbx5 (GMT) or GMT plus Hand2 (GHMT) directly reprogram fibroblasts into cardiomyocyte-like cells (iCMs). However, the critical timing of transgene expression and the molecular mechanisms for cardiac reprogramming remain unclear. The conventional doxycycline (Dox)-inducible temporal transgene expression systems require simultaneous transduction of two vectors (pLVX-rtTA/pLVX-cDNA) harboring the reverse tetracycline transactivator (rtTA) and the tetracycline response element (TRE)-controlled transgene, respectively, leading to inefficient cardiac reprogramming. Herein, we developed a single-construct-based polycistronic Dox-inducible vector (pDox-cDNA) expressing both the rtTA and TRE-controlled transgenes. Fluorescence activated cell sorting (FACS) analyses, quantitative RT-PCR, and immunostaining revealed that pDox-GMT increased cardiac reprogramming three-fold compared to the conventional pLVX-rtTA/pLVX-GMT. After four weeks, pDox-GMT-induced iCMs expressed multiple cardiac genes, produced sarcomeric structures, and beat spontaneously. Co-transduction of pDox-Hand2 with retroviral pMX-GMT increased cardiac reprogramming three-fold compared to pMX-GMT alone. Temporal Dox administration revealed that Hand2 transgene expression is critical during the first two weeks of cardiac reprogramming. Microarray analyses demonstrated that Hand2 represses cell cycle-promoting genes and enhances cardiac reprogramming. Thus, we have developed an efficient temporal transgene expression system, which could be invaluable in the study of cardiac reprogramming. | Single-Construct Polycistronic Doxycycline-Inducible Vectors Improve Direct Cardiac Reprogramming and Can Be Used to Identify the Critical Timing of Transgene Expression |
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"27099": 0.09050461649894714, "27734": 0.6699305176734924, "27989": 0.8600510358810425, "28046": 1.2477279901504517, "28251": 1.2290464639663696, "28290": 0.0797421783208847, "28466": 0.10379679501056671, "28696": 0.10291612148284912, "28767": 0.1873544454574585, "28829": 0.5010119676589966, "28927": 0.3519764244556427, "29336": 0.7665573358535767, "29477": 0.13243216276168823, "29610": 0.12556517124176025} | 9638032 | Leucine-rich repeat kinase 2 (LRRK2) mutations are the most common genetic cause of Parkinson's disease. LRRK2 is a multifunctional protein affecting many cellular processes and has been described to bind microtubules. Defective microtubule-based axonal transport is hypothesized to contribute to Parkinson's disease, but whether LRRK2 mutations affect this process to mediate pathogenesis is not known. Here we find that LRRK2 containing pathogenic Roc-COR domain mutations (R1441C, Y1699C) preferentially associates with deacetylated microtubules, and inhibits axonal transport in primary neurons and in Drosophila, causing locomotor deficits in vivo. In vitro, increasing microtubule acetylation using deacetylase inhibitors or the tubulin acetylase αTAT1 prevents association of mutant LRRK2 with microtubules, and the deacetylase inhibitor trichostatin A (TSA) restores axonal transport. In vivo knockdown of the deacetylases HDAC6 and Sirt2, or administration of TSA rescues both axonal transport and locomotor behavior. Thus, this study reveals a pathogenic mechanism and a potential intervention for Parkinson's disease. | Increasing microtubule acetylation rescues axonal transport and locomotor deficits caused by LRRK2 Roc-COR domain mutations |
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"25409": 0.6999598741531372, "25456": 0.6086184978485107, "25476": 0.32058215141296387, "25644": 0.1710275560617447, "25690": 1.149384617805481, "25714": 0.05139094591140747, "25972": 0.1913948506116867, "26402": 1.0628231763839722, "26462": 0.3141832649707794, "26520": 0.34023189544677734, "26524": 0.9271688461303711, "26537": 1.5365312099456787, "26597": 0.022212404757738113, "26773": 0.3283478021621704, "26906": 0.015504186972975731, "27145": 0.14939609169960022, "27152": 0.01934296265244484, "27287": 0.8813109993934631, "27642": 0.1734936386346817, "27881": 0.04953393340110779, "28086": 1.3160102367401123, "28156": 0.4837033152580261, "28177": 0.3170322775840759, "28427": 0.21530038118362427, "28522": 1.108330488204956, "28637": 0.043007105588912964, "28691": 0.0038986403960734606, "28696": 0.9980146884918213, "28774": 0.9635916948318481, "28788": 0.20580662786960602, "28790": 0.2852376699447632, "28873": 0.06246116757392883, "29486": 0.11517547070980072} | 9641846 | The ability of progenitor cells to exit the cell cycle is essential for proper embryonic development and homeostasis, but the mechanisms governing cell cycle exit are still not fully understood. Here, we tested the requirement for the retinoblastoma (Rb) protein and its family members p107 and p130 in G0/G1 arrest and differentiation in mammalian cells. We found that Rb family triple knockout (TKO) mouse embryos survive until days 9-11 of gestation. Strikingly, some TKO cells, including in epithelial and neural lineages, are able to exit the cell cycle in G0/G1 and differentiate in teratomas and in culture. This ability of TKO cells to arrest in G0/G1 is associated with the repression of key E2F target genes. Thus, G1 arrest is not always dependent on Rb family members, which illustrates the robustness of cell cycle regulatory networks during differentiation and allows for the identification of candidate pathways to inhibit the expansion of cancer cells with mutations in the Rb pathway. | G1 arrest and differentiation can occur independently of Rb family function |
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"25688": 0.13755162060260773, "25700": 0.5415972471237183, "26083": 1.4413889646530151, "26290": 0.052318159490823746, "26305": 0.4556184411048889, "26315": 0.6872705817222595, "26524": 0.6553317308425903, "26534": 0.3127557039260864, "26741": 0.4330752193927765, "26775": 0.09406650811433792, "26874": 0.23556606471538544, "26927": 0.6603899002075195, "27058": 0.9900637865066528, "27330": 0.3956514894962311, "27511": 0.04767346754670143, "27633": 0.8917738795280457, "27642": 0.11343330889940262, "28086": 0.06520967930555344, "28156": 0.29400965571403503, "28290": 0.1212492436170578, "28624": 1.1616848707199097, "28637": 0.08961215615272522, "29146": 0.4568560719490051, "29206": 0.11256109178066254, "29342": 0.9987343549728394, "29347": 0.12986256182193756} | 9646449 | The Drosophila gene eyeless (ey) encodes a transcription factor with both a paired domain and a homeodomain. It is homologous to the mouse Small eye (Pax-6) gene and to the Aniridia gene in humans. These genes share extensive sequence identity, the position of three intron splice sites is conserved, and these genes are expressed similarly in the developing nervous system and in the eye during morphogenesis. Loss-of-function mutations in both the insect and in the mammalian genes have been shown to lead to a reduction or absence of eye structures, which suggests that ey functions in eye morphogenesis. By targeted expression of the ey complementary DNA in various imaginal disc primordia of Drosophila, ectopic eye structures were induced on the wings, the legs, and on the antennae. The ectopic eyes appeared morphologically normal and consisted of groups of fully differentiated ommatidia with a complete set of photoreceptor cells. These results support the proposition that ey is the master control gene for eye morphogenesis. Because homologous genes are present in vertebrates, ascidians, insects, cephalopods, and nemerteans, ey may function as a master control gene throughout the metazoa. | Induction of ectopic eyes by targeted expression of the eyeless gene in Drosophila. |
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0.47402387857437134, "27152": 0.42990362644195557, "27453": 0.3662964701652527, "27673": 0.07159364968538284, "27777": 0.45623743534088135, "27781": 0.2018241584300995, "27854": 0.17020416259765625, "27881": 0.20660123229026794, "28125": 0.19381128251552582, "28207": 0.10993985831737518, "28522": 1.1012130975723267, "28712": 0.804835319519043, "28873": 0.04113444685935974, "29172": 0.2637155055999756, "29191": 0.004870930220931768, "29490": 0.8091925978660583, "29500": 0.3141832649707794} | 9648896 | Lung cancer is the leading cause of cancer-related mortality in humans worldwide. Moreover, the overall 5-year survival rate is only 15%. Pathologically almost 80% of all lung cancer cases are non-small cell lung cancer (NSCLC). Cancer-associated fibroblasts (CAFs) have been found to exist in a large number of NSCLCs. CAFs have been proven to promote tumor progression, metastasis and resistance to therapy through paracrine effects in most solid tumors. In the present study, firstly we isolated CAFs from patient tissues and demonstrated that they promoted cell proliferation and chemoresistance to cisplatin in the lung cancer cell lines A549 and 95D in a paracrine manner. Secondly, using ELISA and quantative PCR, we found that a higher amount of stromal cell-derived factor 1 (SDF-1) existed in the CAFs rather than that observed in the normal fibroblasts (NFs). Thirdly, we detected that SDF-1 facilitated lung cancer cell proliferation and drug resistance via the CXCR4-mediated signaling pathway which involved NF-κB and Bcl-xL. Moreover, we also confirmed that the expression level of SDF-1 in the CAFs was negatively regulated by microRNA mir-1 through microRNA overexpression and quantitative PCR. Overall, our data provide one explanation for the effects of CAFs on lung cancer cells. Meanwhile, our results also suggest CAFs as a potential therapeutic target in tumor treatment. | mir-1-mediated paracrine effect of cancer-associated fibroblasts on lung cancer cell proliferation and chemoresistance. |
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"26305": 0.6654226183891296, "26572": 0.28082266449928284, "26601": 0.3339579105377197, "26741": 0.5690577030181885, "26775": 0.025073638185858727, "26835": 0.12642613053321838, "26874": 0.20818853378295898, "26986": 0.07341018319129944, "27974": 0.13670019805431366, "28024": 0.7124901413917542, "28207": 0.05786345899105072, "28290": 0.13755162060260773, "28321": 0.04674193635582924, "28436": 0.12556517124176025, "28637": 0.07068414986133575, "28667": 0.13414156436920166, "28873": 0.10818854719400406, "29371": 0.14433705806732178, "29458": 0.04953393340110779} | 9650982 | To identify new genetic factors for colorectal cancer (CRC), we conducted a genome-wide association study in east Asians. By analyzing genome-wide data in 2,098 cases and 5,749 controls, we selected 64 promising SNPs for replication in an independent set of samples, including up to 5,358 cases and 5,922 controls. We identified four SNPs with association P values of 8.58 × 10(-7) to 3.77 × 10(-10) in the combined analysis of all east Asian samples. Three of the four were replicated in a study conducted in 26,060 individuals of European descent, with combined P values of 1.22 × 10(-10) for rs647161 (5q31.1), 6.64 × 10(-9) for rs2423279 (20p12.3) and 3.06 × 10(-8) for rs10774214 (12p13.32 near the CCND2 gene), derived from meta-analysis of data from both east Asian and European-ancestry populations. This study identified three new CRC susceptibility loci and provides additional insight into the genetics and biology of CRC. | Genome-wide association analyses in East Asians identify new susceptibility loci for colorectal cancer |
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"24558": 0.32129061222076416, "24978": 0.3106105625629425, "25028": 0.03925827145576477, "25531": 0.04953393340110779, "25644": 0.8941729068756104, "26013": 0.08871890604496002, "26163": 0.3622259199619293, "26356": 0.053244512528181076, "26512": 0.13925230503082275, "26601": 0.14518201351165771, "26773": 0.5376120805740356, "26835": 0.6729245185852051, "27166": 0.36697331070899963, "27642": 0.11865071207284927, "27698": 0.24171993136405945, "27781": 0.13071982562541962, "27969": 0.45623743534088135, "28283": 0.5370414853096008, "28848": 0.8625272512435913, "28991": 0.1751343309879303, "29533": 0.15275461971759796} | 9655347 | BACKGROUND Long non-coding RNAs (lncRNAs) are a sub-class within non-coding RNA repertoire that have emerged as crucial regulators of the gene expression in various pathophysiological conditions. lncRNAs display remarkable versatility and wield their functions through interactions with RNA, DNA, or proteins. Accumulating body of evidence based on multitude studies has highlighted the role of lncRNAs in many autoimmune and inflammatory diseases, including type 1 diabetes (T1D). This review highlights emerging roles of lncRNAs in immune and islet β cell function as well as some of the challenges and opportunities in understanding the pathogenesis of T1D and its complications. CONCLUSION We accentuate that the lncRNAs within T1D-loci regions in consort with regulatory variants and enhancer clusters orchestrate the chromatin remodeling in β cells and thereby act as cis/trans-regulatory determinants of islet cell transcriptional programs. | Long non-coding RNAs as novel players in β cell function and type 1 diabetes |
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0.083342544734478, "20621": 0.2696990668773651, "20694": 0.34370049834251404, "20736": 0.22704219818115234, "20794": 0.25995752215385437, "21150": 0.3656192123889923, "21326": 0.8074519634246826, "21557": 0.15860503911972046, "21791": 0.15023678541183472, "21908": 1.0151457786560059, "22084": 0.16110190749168396, "22173": 0.20102575421333313, "22935": 0.10906458646059036, "22963": 0.16276304423809052, "23041": 0.06154331564903259, "23208": 0.10291612148284912, "23274": 0.5370414853096008, "24010": 0.1873544454574585, "24501": 0.8100618124008179, "24582": 1.0775588750839233, "24887": 0.13157635927200317, "25581": 0.48670899868011475, "25613": 0.06337817758321762, "25624": 0.19862671196460724, "26180": 0.5393219590187073, "26220": 1.521289587020874, "27263": 0.10203468054533005, "27885": 0.5255602598190308, "28227": 0.28670501708984375, "28268": 0.2501201331615448, "28483": 0.8608771562576294, "28648": 0.1889725625514984, "29125": 0.0354953333735466} | 9658390 | INTRODUCTION To assess whether respiratory intermediate care units (RICUs) are cost effective alternatives to intensive care units (ICUs) for patients with exacerbation of chronic obstructive pulmonary disease (COPD). PATIENTS AND METHODS Multi-centre, prospective, bottom-up cost study performed in 15 ICUs and 6 RICUs. COPD patients staying longer than 48 h were recruited; those coming from other ICUs/RICUs, with immune-deficiency or stroke, were excluded. After the ICU sample was standardised to the RICU distribution of the reason-for-admission and infusion of a vasoactive drug on admission, 60 ICU patients and 65 RICU patients remained, of the original 164 recruited. For each patient, besides clinical data on admission and discharge, daily information about the resources consumed were recorded and analysed in terms of their costs. RESULTS Total cost per patient was lower in RICUs than in ICUs (754 vs. 1507 Euro; P < 0.0001). In all items, except drugs and nutrition, we found a significant lower cost in RICUs. Dead patients were noticeably different in terms of disease severity between ICUs and RICUs, while surviving ones were not. CONCLUSIONS Our study suggests that some COPD patients, less severe and with pure respiratory failure, could be successfully and less costly treated in RICUs. | Costs of the COPD. Differences between intensive care unit and respiratory intermediate care unit. |
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Using genome-wide chromatin-binding profiles, we describe binding of p53 also to regions located distantly from any known p53 target gene. Interestingly, many of these regions possess conserved p53-binding sites and all known hallmarks of enhancer regions. We demonstrate that these p53-bound enhancer regions (p53BERs) indeed contain enhancer activity and interact intrachromosomally with multiple neighboring genes to convey long-distance p53-dependent transcription regulation. Furthermore, p53BERs produce, in a p53-dependent manner, enhancer RNAs (eRNAs) that are required for efficient transcriptional enhancement of interacting target genes and induction of a p53-dependent cell-cycle arrest. Thus, our results ascribe transcription enhancement activity to p53 with the capacity to regulate multiple genes from a single genomic binding site. Moreover, eRNA production from p53BERs is required for efficient p53 transcription enhancement. | eRNAs are required for p53-dependent enhancer activity and gene transcription. |
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0.5180262327194214, "29290": 0.6420594453811646} | 9675944 | Somatic cells can be induced into pluripotent stem cells (iPSCs) with a combination of four transcription factors, Oct4/Sox2/Klf4/c-Myc or Oct4/Sox2/Nanog/LIN28. This provides an enabling platform to obtain patient-specific cells for various therapeutic and research applications. However, several problems remain for this approach to be therapeutically relevant due to drawbacks associated with efficiency and viral genome integration. Recently, it was shown that neural progenitor cells (NPCs) transduced with Oct4/Klf4 can be reprogrammed into iPSCs. However, NPCs express Sox2 endogenously, possibly facilitating reprogramming in the absence of exogenous Sox2. In this study, we identified a small-molecule combination, BIX-01294 and BayK8644, that enables reprogramming of Oct4/Klf4-transduced mouse embryonic fibroblasts, which do not endogenously express the factors essential for reprogramming. This study demonstrates that small molecules identified through a phenotypic screen can compensate for viral transduction of critical factors, such as Sox2, and improve reprogramming efficiency. | Induction of pluripotent stem cells from mouse embryonic fibroblasts by Oct4 and Klf4 with small-molecule compounds. |
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"26394": 0.02887592278420925, "26402": 0.2539152204990387, "26520": 0.15610189735889435, "26773": 0.5952457785606384, "26775": 1.222740888595581, "26874": 0.3526630103588104, "27144": 0.46486347913742065, "27465": 0.09938567131757736, "27598": 0.5707147121429443, "27642": 1.0822023153305054, "27854": 1.1249549388885498, "28041": 0.0913962796330452, "28327": 0.8357921838760376, "28424": 0.0842406153678894, "28517": 0.05970508232712746, "28691": 0.2561853528022766, "28790": 0.5573811531066895, "28848": 0.1751343309879303, "28940": 0.2089812457561493, "28976": 0.05417001247406006, "29107": 0.0174254160374403, "29290": 0.32199856638908386, "29516": 0.0029254043474793434} | 9680193 | The ubiquitin-binding protein Hrs and endosomal sorting complex required for transport (ESCRT)-I and ESCRT-III are involved in sorting endocytosed and ubiquitinated receptors to lysosomes for degradation and efficient termination of signaling. In this study, we have investigated the role of the ESCRT-II subunit Vps22/EAP30 in degradative protein sorting of ubiquitinated receptors. Vps22 transiently expressed in HeLa cells was detected in endosomes containing endocytosed epidermal growth factor receptors (EGFRs) as well as Hrs and ESCRT-I and ESCRT-III. Depletion of Vps22 by small interfering RNA, which was accompanied by decreased levels of other ESCRT-II subunits, greatly reduced degradation of EGFR and its ligand EGF as well as the chemokine receptor CXCR4. EGFR accumulated on the limiting membranes of early endosomes and aberrantly small multivesicular bodies in Vps22-depleted cells. Phosphorylation and nuclear translocation of extracellular-signal-regulated kinase1/2 downstream of the EGF-activated receptor were sustained by depletion of Hrs or the ESCRT-I subunit Tsg101. In contrast, this was not the case when Vps22 was depleted. These results indicate an important role for Vps22 in ligand-induced EGFR and CXCR4 turnover and suggest that termination of EGF signaling occurs prior to ESCRT-II engagement. | Vps22/EAP30 in ESCRT-II mediates endosomal sorting of growth factor and chemokine receptors destined for lysosomal degradation. |
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"24054": 0.1873544454574585, "24137": 0.31489628553390503, "24872": 0.0174254160374403, "25206": 0.2145126610994339, "25468": 0.10731173306703568, "25690": 0.45251765847206116, "25708": 0.15693697333335876, "25761": 1.0533316135406494, "26296": 0.5404602885246277, "26305": 0.2881702482700348, "26402": 0.1229778528213501, "26601": 0.8780695199966431, "26726": 1.439538836479187, "26741": 0.21135559678077698, "26773": 0.3757305145263672, "26874": 0.02412080205976963, "27360": 0.03925827145576477, "27381": 0.255429208278656, "27480": 0.11256109178066254, "27697": 0.9576126337051392, "27790": 0.8941729068756104, "27854": 0.0009760859538801014, "28290": 0.2918238639831543, "28450": 0.043007105588912964, "28472": 1.216395378112793, "28577": 0.15359249711036682, "28685": 0.18167030811309814, "28715": 1.17624831199646, "28815": 1.2353124618530273, "28828": 0.36358460783958435, "28829": 0.3723714053630829, "28873": 0.1332872211933136, "28927": 0.21293537318706512} | 9687772 | Mutations in the human XPG gene give rise to an inherited photosensitive disorder, xeroderma pigmentosum (XP) associated with Cockayne syndrome (XP-G/CS). The clinical features of CS in XP-G/CS patients are difficult to explain on the basis of a defect in nucleotide excision repair (NER). We found that XPG forms a stable complex with TFIIH, which is active in transcription and NER. Mutations in XPG found in XP-G/CS patient cells that prevent the association with TFIIH also resulted in the dissociation of CAK and XPD from the core TFIIH. As a consequence, the phosphorylation and transactivation of nuclear receptors were disturbed in XP-G/CS as well as xpg(-/-) MEF cells and could be restored by expression of wild-type XPG. These results provide an insight into the role of XPG in the stabilization of TFIIH and the regulation of gene expression and provide an explanation of some of the clinical features of XP-G/CS. | XPG stabilizes TFIIH, allowing transactivation of nuclear receptors: implications for Cockayne syndrome in XP-G/CS patients. |
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We used FISH of mRNA in individual cells to test the hypothesis that these oscillations happen in single cells drawn from unsynchronized cultures growing exponentially in chemostats. Gene-expression data from synchronized cultures were used to predict coincident appearance of mRNAs from pairs of genes in the unsynchronized cells. Quantitative analysis of the FISH results shows that individual unsynchronized cells growing slowly because of glucose limitation or phosphate limitation show the predicted oscillations. We conclude that the yeast metabolic cycle is an intrinsic property of yeast metabolism and does not depend on either synchronization or external limitation of growth by the carbon source. | Metabolic cycling in single yeast cells from unsynchronized steady-state populations limited on glucose or phosphate. |
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0.014542185701429844, "26874": 0.2689530849456787, "27080": 0.06520967930555344, "27467": 1.2605451345443726, "27530": 0.14602625370025635, "27642": 0.13925230503082275, "27777": 0.22937409579753876, "28024": 0.0354953333735466, "28079": 0.40285754203796387, "28348": 0.7134475708007812, "28517": 0.0038986403960734606, "28637": 0.052318159490823746, "29297": 1.1128336191177368} | 9704467 | We developed the Yeast Gene Order Browser (YGOB; http://wolfe.gen.tcd.ie/ygob) to facilitate visual comparisons and computational analysis of synteny relationships in yeasts. The data presented in YGOB, currently covering seven species, are based on sets of homologous genes that have been intensively manually curated based on both sequence similarity and genomic context (synteny). We reconciled different laboratories' lists of paralogous Saccharomyces cerevisiae gene pairs formed by genome duplication (ohnologs), and present near-exhaustive lists of the ohnolog pairs retained in S. cerevisiae (551, including 22 previously unidentified), Saccharomyces castellii (599), and Candida glabrata (404). | in polyploid species |
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However, the properties of SCS macrophages are poorly defined. Here we show SCS macrophage development depended on lymphotoxin-alpha1beta2, and the cells had low lysosomal enzyme expression and retained opsonized antigens on their surface. Intravital imaging revealed immune complexes moving along macrophage processes into the follicle. Moreover, noncognate B cells relayed antigen opsonized by newly produced antibodies from the subcapsular region to the germinal center, and affinity maturation was impaired when this transport process was disrupted. Thus, we characterize SCS macrophages as specialized antigen-presenting cells functioning at the apex of an antigen transport chain that promotes humoral immunity. | Immune complex relay by subcapsular sinus macrophages and non-cognate B cells drives antibody affinity maturation |
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Using microfluidics to control the nucleocytoplasmic translocation dynamics of the budding yeast TF Msn2, we elucidate the principles that govern how different promoters convert dynamical Msn2 input into gene expression output in single cells. Combining modeling and experiments, we classify promoters according to their signal-processing behavior and reveal that multiple, distinct gene expression programs can be encoded in the dynamics of Msn2. We show that both oscillatory TF dynamics and slow promoter kinetics lead to higher noise in gene expression. Furthermore, we show that the promoter activation timescale is related to nucleosome remodeling. Our findings imply a fundamental trade-off: although the cell can exploit different promoter classes to differentially control gene expression using TF dynamics, gene expression noise fundamentally limits how much information can be encoded in the dynamics of a single TF and reliably decoded by promoters. | Promoter decoding of transcription factor dynamics involves a trade-off between noise and control of gene expression |
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"28863": 0.03360854089260101, "28991": 1.3054782152175903, "29061": 0.1734936386346817, "29107": 0.21214580535888672, "29237": 0.3750596046447754} | 9730755 | Arrays of III-V direct-bandgap semiconductor nanopillars represent promising photovoltaic candidates due to their inherent high optical absorption coefficients and minimized reflection arising from light trapping, efficient charge collection in the radial direction and the ability to synthesize them on low-cost platforms. However, the increased surface area results in surface states that hamper the power conversion efficiency. Here, we report the first demonstration of GaAs nanopillar-array photovoltaics employing epitaxial passivation with air mass 1.5 global power conversion efficiencies of 6.63%. High-bandgap epitaxial InGaP shells are grown in situ and cap the radial p-n junctions to alleviate surface-state effects. Under light, the photovoltaic devices exhibit open-circuit voltages of 0.44 V, short-circuit current densities of 24.3 mA cm(-2) and fill factors of 62% with high external quantum efficiencies >70% across the spectral regime of interest. A novel titanium/indium tin oxide annealed alloy is exploited as transparent ohmic anode. | GaAs nanopillar-array solar cells employing in situ surface passivation |
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1.2677175998687744, "26874": 0.35745587944984436, "26928": 0.1064341589808464, "27642": 0.1384023278951645, "27989": 0.05417001247406006, "28177": 0.01934296265244484, "28370": 0.9440274834632874, "28667": 0.9178520441055298, "28691": 0.030771657824516296, "29297": 0.7647408246994019, "29391": 0.08513788133859634} | 9732010 | Histone acetyltransferases (HATs) and ATP-dependent chromatin remodeling factors (ADCRs) are involved in selective gene regulation via modulation of local chromatin configuration. Activation of the recombination hotspot ade6-M26 of Schizosaccharomyces pombe is mediated by a cAMP responsive element (CRE)-like sequence, M26, and a heterodimeric ATF/CREB transcription factor, Atf1.Pcr1. Chromatin remodeling occurs meiotically around M26. We examined the roles of HATs and ADCRs in chromatin remodeling around M26. Histones H3 and H4 around M26 were hyperacetylated in an M26- and Atf1-dependent manner early in meiosis. SpGcn5, the S. pombe homolog of Gcn5p, was required for the majority of histone H3 acetylation around M26 in vivo. Deletion of gcn5+ caused a significant delay in chromatin remodeling but only partial reduction of M26 meiotic recombination frequency. The snf22+ (a Swi2/Snf2-ADCR homologue) deletion and snf22+ gcn5+ double deletion abolished chromatin remodeling and significant reduction of meiotic recombination around M26. These results suggest that HATs and ADCRs cooperatively alter local chromatin structure, as in selective transcription activation, to activate meiotic recombination at M26 in a site-specific manner. | Roles of histone acetylation and chromatin remodeling factor in a meiotic recombination hotspot. |
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1.245482087135315, "28828": 0.1751343309879303, "28848": 0.6714286804199219, "29107": 0.1970241367816925, "29206": 0.11343330889940262, "29226": 0.02412080205976963, "29458": 0.5324648022651672, "29480": 0.6149744987487793} | 9737083 | We describe the landscape of somatic genomic alterations based on multidimensional and comprehensive characterization of more than 500 glioblastoma tumors (GBMs). We identify several novel mutated genes as well as complex rearrangements of signature receptors, including EGFR and PDGFRA. TERT promoter mutations are shown to correlate with elevated mRNA expression, supporting a role in telomerase reactivation. Correlative analyses confirm that the survival advantage of the proneural subtype is conferred by the G-CIMP phenotype, and MGMT DNA methylation may be a predictive biomarker for treatment response only in classical subtype GBM. Integrative analysis of genomic and proteomic profiles challenges the notion of therapeutic inhibition of a pathway as an alternative to inhibition of the target itself. These data will facilitate the discovery of therapeutic and diagnostic target candidates, the validation of research and clinical observations and the generation of unanticipated hypotheses that can advance our molecular understanding of this lethal cancer. | The Somatic Genomic Landscape of Glioblastoma |
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"27144": 0.27786844968795776, "28228": 0.7782850861549377, "28846": 0.18329764902591705, "29090": 0.6181373596191406, "29514": 0.22859740257263184, "29610": 1.564702033996582} | 9745001 | OBJECTIVE To investigate the long term effect of radioactive iodine on thyroid function and size in patients with non-toxic multinodular goitre. DESIGN Consecutive patients with multinodular non-toxic goitre selected for radioactive iodine treatment and followed for a minimum of 12 months (median 48 months) after an intended dose of 3.7 MBq/g thyroid tissue corrected to a 100% uptake of iodine-131 in 24 hours. PATIENTS 69 patients with a growing multinodular non-toxic goitre causing local compression symptoms or cosmetic inconveniences. The treatment was chosen because of a high operative risk, previous thyroidectomy, or refusal to be operated on. MAIN OUTCOME MEASUREMENTS Standard thyroid function variables and ultrasonically determined thyroid volume before treatment as well as 1, 2, 3, 6, and 12 months after treatment and then once a year. RESULTS 56 patients were treated with a single dose of 131I, 12 with two doses, and one with four doses. In 45 patients treated with one dose and remaining euthyroid the median thyroid volume was reduced from 73 (interquartile range 50-106) ml to 29 (23-48) ml at 24 months in the 39 patients in whom this was measured during follow up. The median reduction was 40 (22-48) ml (60% reduction, p < 0.0001), half of which occurred within three months. Patients treated with two doses as well as those developing hypothyroidism and hyperthyroidism had a significant reduction in thyroid volume. Eleven patients developed hypothyroidism (cumulative five year risk 22%, 95% confidence interval 4.8% to 38.4%). Side effects were few: three cases of hyperthyroidism and two cases of radiation thyroiditis. Only one patient was dissatisfied with the result; she was referred for operation six months after treatment. CONCLUSIONS A substantial reduction in thyroid volume accompanied by a low incidence of hypothyroidism and few side effects makes the use of radioactive iodine an attractive alternative to surgery in selected cases of non-toxic multinodular goitre. | Radioiodine treatment of multinodular non-toxic goitre. |
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Here we show that forebrain-specific expression of FTD-associated mutant CHMP2B in mice causes several age-dependent neurodegenerative phenotypes, including social behavioral impairments. The social deficits were accompanied by a change in AMPA receptor (AMPAR) composition, leading to an imbalance between Ca(2+)-permeable and Ca(2+)-impermeable AMPARs. Expression of most AMPAR subunits was regulated by the brain-enriched microRNA miR-124, whose abundance was markedly decreased in the superficial layers of the cerebral cortex of mice expressing the mutant CHMP2B. We found similar changes in miR-124 and AMPAR levels in the frontal cortex and induced pluripotent stem cell-derived neurons from subjects with behavioral variant FTD. Moreover, ectopic miR-124 expression in the medial prefrontal cortex of mutant mice decreased AMPAR levels and partially rescued behavioral deficits. Knockdown of the AMPAR subunit Gria2 also alleviated social impairments. Our results identify a previously undescribed mechanism involving miR-124 and AMPARs in regulating social behavior in FTD and suggest a potential therapeutic avenue. | Alterations in microRNA-124 and AMPA receptors contribute to social behavioral deficits in frontotemporal dementia |
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"26819": 0.0842406153678894, "26986": 0.42799583077430725, "27292": 0.5174443125724792, "27854": 0.1229778528213501, "27896": 0.16524957120418549, "28014": 0.3949938118457794, "28086": 0.9929623603820801, "28156": 0.24325250089168549, "28309": 0.09495500475168228, "28479": 0.1332872211933136, "28522": 0.4831010699272156, "28600": 1.1300151348114014, "28696": 0.848413348197937, "28728": 0.3070250153541565, "28848": 0.4437839686870575, "28976": 0.11778303235769272, "29300": 0.0797421783208847, "29491": 0.7144040465354919, "29720": 0.5381823778152466} | 9752604 | In light of the emerging interplay between redox and metabolic signaling pathways we investigated the potential cross talk between nuclear factor E2-related factor 2 (Nrf2) and AMP-activated kinase (AMPK), central regulators of the cellular redox and energy balance, respectively. Making use of xanthohumol (XN) as an activator of both the AMPK and the Nrf2 signaling pathway we show that AMPK exerts a positive influence on Nrf2/heme oxygenase (HO)-1 signaling in mouse embryonic fibroblasts. Genetic ablation and pharmacological inhibition of AMPK blunts Nrf2-dependent HO-1 expression by XN already at the mRNA level. XN leads to AMPK activation via interference with mitochondrial function and activation of liver kinase B1 as upstream AMPK kinase. The subsequent AMPK-mediated enhancement of the Nrf2/HO-1 response does not depend on inhibition of the mammalian target of rapamycin, inhibition of glycogen synthase kinase 3β, or altered abundance of Nrf2 (total and nuclear). However, reduced endoplasmic reticulum stress was identified and elaborated as a step in the AMPK-augmented Nrf2/HO-1 response. Overall, we shed more light on the hitherto incompletely understood cross talk between the LKB1/AMPK and the Nrf2/HO-1 axis revealing for the first time involvement of the unfolded protein response as an additional player and suggesting tight cooperation between signaling pathways controlling cellular redox, energy, or protein homeostasis. | Activated AMPK boosts the Nrf2/HO-1 signaling axis—A role for the unfolded protein response |
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0.08513788133859634, "27703": 0.0752234235405922, "28297": 0.7201237678527832, "28472": 0.0019512200960889459, "28616": 0.5021947622299194, "28804": 0.1221139207482338, "28987": 0.006812678650021553, "29308": 0.3850763738155365} | 9754530 | Like other branches of surgery, Urology has encountered major challenges in aligning the research processes by which new interventions are assessed with the principles of Evidence-Based Medicine. This article explains the IDEAL framework and recommendations and illustrates how they might affect the evaluation of current controversial urological procedures. From an inside perspective, we provide an overview of the efforts of the IDEAL Working Group to date with special emphasis on the field of Urology. There are clear differences between drugs and interventions in the natural history of innovations. Since the conventional framework for conducting trials of new treatments is largely based on the former, the evaluation of surgical innovations using the same template can encounter significant problems. Difficulties in performing randomized controlled trials of surgical techniques and the persistence of the case series as an important feature of the scientific literature have been the two most controversial aspects of this mismatch between the subject of research and the methodology used. The IDEAL framework provides a description of the process of innovation and development for surgical trials, and the associated recommendations provide a suggested alternative approach to developing study designs, which are appropriate for the specific problems of new techniques. IDEAL provides a new framework for surgical innovation that was developed with broad stakeholder input from the surgical community and is expected to have a transformative impact on the way that urologists perform clinical research. | The IDEAL recommendations and urological innovation |
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"27354": 0.0317181795835495, "27697": 0.009718249551951885, "28711": 0.09761575609445572, "29251": 0.10731173306703568, "29391": 0.32553088665008545, "29401": 0.12038381397724152, "29513": 0.018384648486971855} | 9754833 | OBJECTIVES To evaluate the effects of early lumbar disc surgery compared with prolonged conservative care for patients with sciatica over two years of follow-up. DESIGN Randomised controlled trial. SETTING Nine Dutch hospitals. PARTICIPANTS 283 patients with 6-12 weeks of sciatica. INTERVENTIONS Early surgery or an intended six months of continued conservative treatment, with delayed surgery if needed. MAIN OUTCOME MEASURES Scores from Roland disability questionnaire for sciatica, visual analogue scale for leg pain, and Likert self rating scale of global perceived recovery. RESULTS Of the 141 patients assigned to undergo early surgery, 125 (89%) underwent microdiscectomy. Of the 142 patients assigned to conservative treatment, 62 (44%) eventually required surgery, seven doing so in the second year of follow-up. There was no significant overall difference between treatment arms in disability scores during the first two years (P=0.25). Improvement in leg pain was faster for patients randomised to early surgery, with a significant difference between "areas under the curves" over two years (P=0.05). This short term benefit of early surgery was no longer significant by six months and continued to narrow between six months and 24 months. Patient satisfaction decreased slightly between one and two years for both groups. At two years 20% of all patients reported an unsatisfactory outcome. CONCLUSIONS Early surgery achieved more rapid relief of sciatica than conservative care, but outcomes were similar by one year and these did not change during the second year. TRIAL REGISTRY ISRCT No 26872154. | Prolonged conservative care versus early surgery in patients with sciatica caused by lumbar disc herniation: two year results of a randomised controlled trial. |
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0.07250232994556427} | 9764256 | BACKGROUND Human papillomavirus (HPV) testing is more sensitive for the detection of high-grade cervical lesions than is cytology, but detection of HPV by DNA screening in two screening rounds 5 years apart has not been assessed. The aim of this study was to assess whether HPV DNA testing in the first screen decreases detection of cervical intraepithelial neoplasia (CIN) grade 3 or worse, CIN grade 2 or worse, and cervical cancer in the second screening. METHODS In this randomised trial, women aged 29-56 years participating in the cervical screening programme in the Netherlands were randomly assigned to receive HPV DNA (GP5+/6+-PCR method) and cytology co-testing or cytology testing alone, from January, 1999, to September, 2002. Randomisation (in a 1:1 ratio) was done with computer-generated random numbers after the cervical specimen had been taken. At the second screening 5 years later, HPV DNA and cytology co-testing was done in both groups; researchers were masked to the patient's assignment. The primary endpoint was the number of CIN grade 3 or worse detected. Analysis was done by intention to screen. The trial is now finished and is registered, number ISRCTN20781131. FINDINGS 22,420 women were randomly assigned to the intervention group and 22 518 to the control group; 19 999 in the intervention group and 20,106 in the control group were eligible for analysis at the first screen. At the second screen, 19 579 women in the intervention group and 19,731 in the control group were eligible, of whom 16,750 and 16,743, respectively, attended the second screen. In the second round, CIN grade 3 or worse was less common in the intervention group than in the control group (88 of 19 579 in the intervention group vs 122 of 19,731 in the control group; relative risk 0·73, 95% CI 0·55-0·96; p=0·023). Cervical cancer was also less common in the intervention group than in the control group (four of 19 579 in the intervention group vs 14 of 19,731; 0·29, 0·10-0·87; p=0·031). In the baseline round, detection of CIN grade 3 or worse did not differ significantly between groups (171 of 19 999 vs 150 of 20,106; 1·15, 0·92-1·43; p=0·239) but was significantly more common in women with normal cytology (34 of 19,286 vs 12 of 19,373; 2·85, 1·47-5·49; p=0·001). Furthermore, significantly more cases of CIN grade 2 or worse were detected in the intervention group than in the control group (267 of 19 999 vs 215 of 20,106; 1·25, 1·05-1·50; p=0·015). In the second screen, fewer HPV16-positive CIN grade 3 or worse were detected in the intervention group than in the control group (17 of 9481 vs 35 of 9354; 0·48, 0·27-0·85; p=0·012); detection of non-HPV16-positive CIN grade 3 or worse did not differ between groups (25 of 9481 vs 25 of 9354; 0·99, 0·57-1·72; p=1·00). The cumulative detection of CIN grade 3 or worse and CIN grade 2 or worse did not differ significantly between study arms, neither for the whole study group (CIN grade 3 or worse: 259 of 19 999 vs 272 of 20,106; 0·96, 0·81-1·14, p=0·631; CIN grade 2 or worse: 427 of 19 999 vs 399 of 20,106; 1·08, 0·94-1·24; p=0·292), nor for subgroups of women invited for the first time (CIN grade 3 or worse in women aged 29-33 years: 102 of 3139 vs 105 of 3128; 0·97, 0·74-1·27; CIN grade 2 or worse in women aged 29-33 years: 153 of 3139 vs 151 of 3128; 1·01, 0·81-1·26; CIN grade 3 or worse in women aged 34-56 years: 157 of 16,860 vs 167 of 16 978; 0·95, 0·76-1·18; CIN grade 2 or worse in women aged 34-56 years: 274 of 16,860 vs 248 of 16 978; 1·11, 0·94-1·32). INTERPRETATION Implementation of HPV DNA testing in cervical screening leads to earlier detection of clinically relevant CIN grade 2 or worse, which when adequately treated, improves protection against CIN grade 3 or worse and cervical cancer. Early detection of high-grade cervical legions caused by HPV16 was a major component of this benefit. Our results lend support to the use of HPV DNA testing for all women aged 29 years and older. FUNDING Zorg Onderzoek Nederland (Netherlands Organisation for Health Research and Development). | Human papillomavirus testing for the detection of high-grade cervical intraepithelial neoplasia and cancer: final results of the POBASCAM randomised controlled trial. |
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