13 research outputs found

    Low concentrations of bisphenol A induce lipid accumulation mediated by the production of reactive oxygen species in the mitochondria of HepG2 cells

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    International audienceBisphenol A (BPA) is an endocrine-disrupting chemical that leaches from polycarbonate plastics that consequently leads to low-dose human exposure. In addition to its known xenoendocrine action, BPA exerts a wide variety of metabolic effects, but no data are available on its actions on the functions of liver mitochondrial. To assess these effects, HepG2 cells were exposed to BPA (10(-4)-10(-12)M) and physiological parameters were measured by flow cytometry. We demonstrated a significant mitochondrial dysfunction including ROS production, Δι(M) hyperpolarization, lipid accumulation, lipoperoxidation and the release of pro-inflammatory cytokines. In conclusion, we showed that low concentrations of BPA promote lipid accumulation in hepatic cells triggered by disturbances in mitochondrial function, alterations in lipid metabolism and by inflammation that can therefore contribute to steatosis

    Topological properties of the sequence spaces S-nu

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    We define sequence spaces based on the distributions of the wavelet coefficients in the spirit of [S. Jaffard, Beyond Besov spaces, part I: Distributions of wavelet coefficients, J. Fourier Anal. Appl. 10 (2004) 221-246]. We study their topology and especially show that they can be endowed with a (unique) complete metric for which compact sets can be explicitly described and we study properties of this metric. We also give relationships with Besov spaces. (c) 2005 Elsevier Inc. All rights reserved

    Replacement of marine ingredients by plant products in fish diets

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    While world aquaculture has continuously grown (6-8% a year) over the last 30 years, the availability of fish meal (FM) and fish oil (FO), the major fish feed ingredients, was maintained at best stable by quotas in order to preserve marine resources. In this context of increasing demand and limited availability which increased price and market volatility of FM and FO, research had been undertaken by INRA to replace FM and FO by alternative plant ingredients in fish feed. Thanks to a fruitful partnership, current commercial fish feed contain increasing proportions of plant ingredients and much less FM and FO, which participates to the sustainable development of world aquaculture

    Suivi de la qualitĂ© de l’air dans un centre de lutte contre le cancer : Ă©valuation et caractĂ©risation de l’exposition aux contaminants fongiques (Biohospitalair)

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    National audienceContexte. La qualitĂ© de l’air dans un Ă©tablissement de soins est une prĂ©occupation importante en termes de santĂ© publique, en particulier chez les patients immunodĂ©primĂ©s qui peuvent ĂȘtre exposĂ©s Ă  des contaminants d’origine microbiologique tels que les moisissures, les endotoxines, les (1,3)-ß-D-glucanes et les mycotoxines. MĂ©thodes. Le projet Biohospitalair, soutenu par l’Ademe (Agence de l’environnement et de la maĂźtrise de l’énergie), a consistĂ©, durant deux ans, Ă  prĂ©lever mensuellement et Ă  caractĂ©riser des bioaĂ©rosols et des isolats fongiques collectĂ©s dans un centre de lutte contre le cancer (centre F. Baclesse), dans des zones ne possĂ©dant pas de traitement d’air spĂ©cifique. RĂ©sultats. Parmi plus de cent espĂšces fongiques diffĂ©rentes identifiĂ©es, certaines peuvent ĂȘtre retenues en raison de leur frĂ©quence, de leur concentration et/ou de leur capacitĂ© Ă  produire in vitro des mycotoxines : Aspergillus fumigatus, Aspergillus melleus, Aspergillus niger, Aspergillus versicolor, Cladosporium herbarum, Paecilomyces lilacinus, Penicillium brevicompactum. D’un point de vue quantitatif, les niveaux moyens en particules fongiques viables restent infĂ©rieurs Ă  30 CFU/m3 d’air et sont corrĂ©lĂ©s au nombre de particules totales de 0,30 Ă  20 ”m. Cette Ă©tude met Ă©galement en Ă©vidence des variations saisonniĂšres avec l’apparition de pics de particules fongiques en Ă©tĂ© et en automne. De plus, l’analyse statistique rĂ©vĂšle que l’humiditĂ© relative est une variable explicative du nombre de CFU/m3 d’air, ce qui pourrait faire de ce paramĂštre un indicateur de contamination fongique pertinent

    Le Stéréotype

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    Le stĂ©rĂ©otype n’existe pas en soi, et on le croit Ă  tort fixĂ© : il Ă©chappe, se mĂ©tamorphose, produit du neuf avec du vieux. ClĂ© de la production et de l’échange dans notre civilisation, cet impensĂ© toujours en mouvement, ce discours de l’Autre qui investit la pensĂ©e, le discours et l’écriture du Moi, est paradoxalement au cƓur de la crĂ©ation littĂ©raire qui vise Ă  le traquer ou Ă  le dĂ©jouer, image, concept ou croyance, clichĂ©, poncif ou idĂ©e reçue, se manifestant au premier, deuxiĂšme ou niĂšme degrĂ©, hydre ou phĂ©nix, comme dit le poĂšte

    VEGF neutralizing aerosol therapy in primary pulmonary adenocarcinoma with K-ras activating-mutations

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    International audienceK-ras mutations promote angiogenesis in lung cancer and contribute to the drug resistance of cancer cells. It is not clear whether K-ras mutated adenocarcinomas are sensitive to anti-angiogenic therapy with monoclonal antibodies (mAbs) that target vascular endothelial growth factor (VEGF). Anti-angiogenic mAbs are usually delivered systemically, but only a small proportion reaches the lung after intravenous injection. We investigated the relevance of a non-invasive pulmonary route for the delivery of anti-VEGF mAbs in the mouse K-ras(LA1) model. We found that pulmonary delivery of these mAbs significantly reduced the number of tumor lesions and inhibited malignant progression. The antitumor effect involves the VEGFR2-dependent inhibition of blood vessel growth, which impairs tumor proliferation. Pharmacokinetic analysis of aerosolized anti-VEGF showed its low rate of passage into the bloodstream, suggesting that this delivery route is associated with reduced systemic side effects. Our findings highlight the value of the aerosol route for administration of anti-angiogenic mAbs in pulmonary adenocarcinoma with K-ras activating-mutations

    Écritures insolites

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    Ce cahier examine le rĂŽle de l’insolite dans l’écriture, la littĂ©rature française et Ă©trangĂšre, en privilĂ©giant l’époque contemporaine. La fĂ©conditĂ© de l’insolite au niveau du langage y est explorĂ©e ainsi que la permanence d’une poĂ©tique de l’écart. CaractĂ©ristique de la modernitĂ©, surtout depuis le surrĂ©alisme, l’insolite est connotĂ© positivement, il ouvre sur l’exploration de l’inconnu
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