Institution
University of Lausanne
Education•Lausanne, Switzerland•
About: University of Lausanne is a education organization based out in Lausanne, Switzerland. It is known for research contribution in the topics: Population & Medicine. The organization has 20508 authors who have published 46458 publications receiving 1996655 citations. The organization is also known as: Université de Lausanne & UNIL.
Topics: Population, Medicine, Context (language use), Gene, Immune system
Papers published on a yearly basis
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TL;DR: Exposure of human endotheliai cells to TNF and IFN-γ results in a reduced activation of integrin αVβ3, an adhesion receptor that plays a key role in tumor angiogenesis, leading to a decreased αV β3-dependent endothelioi cell adhesion and survival.
Abstract: Administration of tumor necrosis factor (TNF) and gamma interferon (IFN-gamma) to melanoma patients causes selective disruption of the tumor vasculature but the mechanism of this disruption is unknown. Here we report that exposure of human endothelial cells to TNF and IFN-gamma results in a reduced activation of integrin alphaVbeta3, an adhesion receptor that plays a key role in tumor angiogenesis, leading to a decreased alphaVbeta3-dependent endothelial cell adhesion and survival. Detachment and apoptosis of angiogenic endothelial cells was demonstrated in vivo in melanoma metastases of patients treated with TNF and IFN-gamma. These results implicate integrin alphaVbeta3 in the anti-vascular activity of TNF and IFN-gamma and demonstrate a new mechanism by which cytokines control cell adhesion.
448 citations
TL;DR: It is suggested that a “genetic cleansing” of recognition cues occurred after introduction of the Argentine ant, which resulted in the formation of two immense supercolonies, one of which effectively forms the largest cooperative unit ever recorded.
Abstract: Some ants have an extraordinary social organization, called unicoloniality, whereby individuals mix freely among physically separated nests. This type of social organization is not only a key attribute responsible for the ecological domination of these ants, but also an evolutionary paradox and a potential problem for kin selection theory because relatedness between nest mates is effectively zero. The introduction of the Argentine ant in Europe was apparently accompanied by a dramatic loss of inter-nest aggression and the formation of two immense supercolonies (which effectively are two unicolonial populations). Introduced populations experienced only limited loss of genetic diversity at neutral markers, indicating that the breakdown of recognition ability is unlikely to be merely due to a genetic bottleneck. Rather, we suggest that a “genetic cleansing” of recognition cues occurred after introduction. Indeed workers of the same supercolony are never aggressive to each other despite the large geographical distance and considerable genetic differentiation between sampling sites. By contrast, aggression is invariably extremely high between the two supercolonies, indicating that they have become fixed for different recognition alleles. The main supercolony, which ranges over 6,000 km from Italy to the Spanish Atlantic coast, effectively forms the largest cooperative unit ever recorded.
447 citations
TL;DR: PPAR-γ is identified as a target of 5-ASA underlying antiinflammatory effects in the colon, and its activities are associated with the recruitment of coactivators and the activation of a peroxisome-proliferator response element–driven gene.
Abstract: 5-aminosalicylic acid (5-ASA) is an antiinflammatory drug widely used in the treatment of inflammatory bowel diseases. It is known to inhibit the production of cytokines and inflammatory mediators, but the mechanism underlying the intestinal effects of 5-ASA remains unknown. Based on the common activities of peroxisome proliferator-activated receptor-gamma (PPAR-gamma) ligands and 5-ASA, we hypothesized that this nuclear receptor mediates 5-ASA therapeutic action. To test this possibility, colitis was induced in heterozygous PPAR-gamma(+/-) mice and their wild-type littermates, which were then treated with 5-ASA. 5-ASA treatment had a beneficial effect on colitis only in wild-type and not in heterozygous mice. In epithelial cells, 5-ASA increased PPAR-gamma expression, promoted its translocation from the cytoplasm to the nucleus, and induced a modification of its conformation permitting the recruitment of coactivators and the activation of a peroxisome-proliferator response element-driven gene. Validation of these results was obtained with organ cultures of human colonic biopsies. These data identify PPAR-gamma as a target of 5-ASA underlying antiinflammatory effects in the colon.
447 citations
Medical Research Council1, Harvard University2, Lund University3, University of Minnesota4, Duke University5, University of Oulu6, Novo Nordisk7, Technische Universität München8, University College London9, University of Lausanne10, University of Eastern Finland11, National University of Singapore12, King's College London13, University of Bristol14, George Washington University15, National Institutes of Health16, University of Bergen17, University of Michigan18, University of North Carolina at Chapel Hill19, University of Groningen20, Utrecht University21, University of Copenhagen22, Erasmus University Rotterdam23, University of Tübingen24, Harokopio University25, Washington University in St. Louis26, University of Maryland, Baltimore27, University of Granada28, Complutense University of Madrid29, University of Turku30, University of Southern Denmark31, Umeå University32, University of Gothenburg33, Laval University34, University of London35, Pennington Biomedical Research Center36, Lille University of Science and Technology37, Newcastle University38, University of Iceland39, Danube University Krems40, Broad Institute41, University of California, Los Angeles42, Hammersmith Hospital43, University of Cambridge44, National Institute for Health and Welfare45
TL;DR: In this paper, a meta-analysis of data from 45 studies of adults and nine studies of children and adolescents was conducted to confirm or refute unambiguously whether physical activity attenuates the association of FTO with obesity risk.
Abstract: Background: The FTO gene harbors the strongest known susceptibility locus for obesity. While many individual studies have suggested that physical activity (PA) may attenuate the effect of FTO on obesity risk, other studies have not been able to confirm this interaction. To confirm or refute unambiguously whether PA attenuates the association of FTO with obesity risk, we meta-analyzed data from 45 studies of adults (n=218,166) and nine studies of children and adolescents (n=19,268). Methods and Findings: All studies identified to have data on the FTO rs9939609 variant (or any proxy [r(2)>0.8]) and PA were invited to participate, regardless of ethnicity or age of the participants. PA was standardized by categorizing it into a dichotomous variable (physically inactive versus active) in each study. Overall, 25% of adults and 13% of children were categorized as inactive. Interaction analyses were performed within each study by including the FTOxPA interaction term in an additive model, adjusting for age and sex. Subsequently, random effects meta-analysis was used to pool the interaction terms. In adults, the minor (A-) allele of rs9939609 increased the odds of obesity by 1.23-fold/allele (95% CI 1.20-1.26), but PA attenuated this effect (p(interaction) = 0.001). More specifically, the minor allele of rs9939609 increased the odds of obesity less in the physically active group (odds ratio = 1.22/allele, 95% CI 1.19-1.25) than in the inactive group (odds ratio = 1.30/allele, 95% CI 1.24-1.36). No such interaction was found in children and adolescents. Conclusions: The association of the FTO risk allele with the odds of obesity is attenuated by 27% in physically active adults, highlighting the importance of PA in particular in those genetically predisposed to obesity.
447 citations
TL;DR: In this paper, the authors investigated the catalytic reaction that is the oxidation of CO on platinum and observed a distinct atom by atom size dependency for monodispersed platinum clusters on thin MgO(100) films.
Abstract: Nanoclusters open fascinating opportunities for quantum engineering because quantum-size effects become dominant in determining catalytic,1-3 optical,4 electronic,5 and magnetic6 properties. We succeeded in the controlled production of low-energy and high-flux monodispersed cluster beams, which allow for a systematic study of their reactivity after deposition onto a chemically inert substrate. We investigated the catalytic reaction that is the oxidation of CO on platinum and observed a distinct atom by atom size dependency for monodispersed platinum clusters on thin MgO(100) films. These results clearly show that the efficiency of a heterogeneous catalytic reaction can be tuned by the judicious choice of particle size.
447 citations
Authors
Showing all 20911 results
| Name | H-index | Papers | Citations |
|---|---|---|---|
| Peer Bork | 206 | 697 | 245427 |
| Aaron R. Folsom | 181 | 1118 | 134044 |
| Kari Alitalo | 174 | 817 | 114231 |
| Ralph A. DeFronzo | 160 | 759 | 132993 |
| Johan Auwerx | 158 | 653 | 95779 |
| Silvia Franceschi | 155 | 1340 | 112504 |
| Matthias Egger | 152 | 901 | 184176 |
| Bart Staels | 152 | 824 | 86638 |
| Fernando Rivadeneira | 146 | 628 | 86582 |
| Christopher George Tully | 142 | 1843 | 111669 |
| Richard S. J. Frackowiak | 142 | 309 | 100726 |
| Peter Timothy Cox | 140 | 1267 | 95584 |
| Jürg Tschopp | 140 | 328 | 86900 |
| Stylianos E. Antonarakis | 138 | 746 | 93605 |
| Michael Weller | 134 | 1105 | 91874 |