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Contribution à la mise en évidence des effecteurs impliqués dans l'immunité innée d'Armadillidium vulgare, crustacé isopode terrestre infecté par une bactérie du genre Wolbachia

Abstract : Blood cells play a major role in the innate immunity of Crustacea. These defense mechanisms include the cellular and the humoral response. Setting up different reliable technics, we contribute to the break down of the immune response in the terrestrial isopod Armadillidium vulgare free or infected with Wolbachia (a Gram(-) bacterium, parasite of reproduction). Besides the specific assignment of the cellular function relevant to the different hemocyte types, our study led to the purification and characterization of an antibacterial peptide, activity of which is directed against Gram(+). Moreover, we showed that the processing of the C- terminal part of hemocyanin liberated a peptide potent against growth inhibition of the pathogenic fungus Botrytis cinirea. Applied to our model, the proteomic approach confirmed the presence of numerous proteins yet characterized and implied in the two aspects of the immune response of Arthropods. The Wolbachia impact on the immune system was not clearly demonstrated however we stressed on its negative effect on hemocyte cytoskeleton stability.
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Submitted on : Monday, May 29, 2006 - 11:11:22 AM
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Juline Herbiniere. Contribution à la mise en évidence des effecteurs impliqués dans l'immunité innée d'Armadillidium vulgare, crustacé isopode terrestre infecté par une bactérie du genre Wolbachia. Ecologie, Environnement. Université de Poitiers, 2005. Français. ⟨tel-00011699⟩

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