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     <dc:title xml:lang="fr">Mort cellulaire induite par la co-exposition benzo[a]pyrène / éthanol dans les hépatocytes : rôle du remodelage membranaire</dc:title>
     <dcterms:alternative xml:lang="en">Cell death induced by the coexposure benzo[a]pyrene / ethanol in hepatocytes : role of membrane remodelling</dcterms:alternative>
     <dc:subject xml:lang="fr">Hépatocytes</dc:subject><dc:subject xml:lang="fr">mort cellulaire</dc:subject><dc:subject xml:lang="fr">Benzo[a]pyrène</dc:subject><dc:subject xml:lang="fr">éthanol</dc:subject><dc:subject xml:lang="fr">remodelage membranaire</dc:subject>
     <dc:subject xml:lang="en">Hepatocytes</dc:subject><dc:subject xml:lang="en">cell death</dc:subject><dc:subject xml:lang="en">benzo[a]pyrene</dc:subject><dc:subject xml:lang="en">ethanol</dc:subject><dc:subject xml:lang="en">membrane remodelling</dc:subject>
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     <dcterms:abstract xml:lang="fr">Les objectifs de cette thèse sont de déterminer les mécanismes cellulaires et moléculaires mis en jeu lors de la co-exposition de cellules hépatiques à l'éthanol, un toxique alimentaire, et au benzo[a]pyrène (B[a]P), un important contaminant de l’environnement émis lors de combustions incomplètes. L’exposition d’hépatocytes primaires de rat pendant 8h favorise leur collaboration via l’induction d’une déplétion membranaire en cholestérol par le B[a]P, ce qui facilite l’action de l’éthanol à déstabiliser les lysosomes via la phospholipase C-1 pour entraîner la mort par apoptose. Lors d’une exposition répétée sur 96h dans les cellules WIF-B9, celles-ci provoquent une mort précoce par nécrose suivie d’une apoptose tardive via leurs métabolismes. Leur toxicité impliquerait un remodelage membranaire et un stress oxydant avec la production d’espèces réactives de l’oxygène et la variation de l’homéostasie du fer.</dcterms:abstract>
     <dcterms:abstract xml:lang="en">The aim of this work is to determine cellular and molecular mechanisms implicated in the co-exposure to ethanol, a dietary toxic substance, and benzo[a]pyrene (B[a]P), a major environmental contaminant, found during incomplete combustions. Primary rat hepatocytes exposed during 8h showed a cooperation effect between the two molecules through the depletion of membrane cholesterol by B[a]P, which promote ethanol action to destabilize lysosomes through phospholipase C-1 and facilitate apoptosis cell death. After repeated exposure during 96h of WIF-B9 cells, these two molecules provoke an early cell death by necrosis and a late apoptosis through their metabolisms. Their toxic effects implicate membrane remodeling and oxidative stress with reactive oxygen species production and modifications in iron pool.</dcterms:abstract>
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