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<dc:title xml:lang="en">Study of the metabolic aspects of resilience to intestinal infections in Drosophila melanogaster</dc:title>
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<dc:subject xml:lang="fr">Résilience</dc:subject>
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<dc:subject xml:lang="fr">Infection bactérienne</dc:subject>
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<dcterms:abstract xml:lang="fr">Lors d’une infection microbienne, la défense de l’hôte comprend deux facettes complémentaires. Premièrement, le système immunitaire cible les pathogènes dans le but de les éliminer, une attaque correspondant à la résistance. Dans un second temps, l’organisme doit réparer les dégâts causés par le pathogène ou par la réponse immunitaire de l’hôte, un mécanisme appelé résilience. J’ai étudié les effets d’une infection intestinale par la bactérie Serratia marcescens chez la drosophile. Nous avons mis en évidence un processus de purge dans l’intestin, lors duquel les enterocytes -les cellules principales de l’intestin- se vident partiellement de leur contenu. L’épithélium intestinal devient alors très fin mais se régénère rapidement, protégeant ainsi la mouche des effets délétères de l’infection. J’ai identifié un transporteur d’acides aminés, CG1139, qui est nécessaire à la régénération de l’intestin. CG1139 est requis pour la mobilisation de certaines réserves métaboliques de la drosophile et pour le transport rétrograde de ces dernières vers l’intestin.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Upon microbial infections, host defenses comprise two complementary facets. First, immune effectors target and kill the invading pathogen, an attack referred to as resistance. Second, the infected host must repair the damages inflicted by microbes or by the immune response itself, a mechanism called resilience. I have studied the effects of an intestinal infection with the bacterium Serratia marcescens in Drosophila. We have discovered a purge mechanism in the intestine, where enterocytes -the main cell type in the gut- extrude some of their internal contents. The intestinal epithelium thus becomes very thin but rapidly recovers its shape, thereby protecting the fly against the deleterious effects of infection. I have identified an amino acid transporter, CG1139, which is required for the intestinal recovery. CG1139 is necessary to mobilize the fly’s internal metabolic reserves and to transport some these metabolic stores back to the gut, in a retrograde manner.</dcterms:abstract>
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