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- W2051957916 abstract "Candida albicans ( C. albicans ) est une levure commensale, habituellement présente sur les muqueuses de l’homme. L’adhérence aux cellules épithéliales constitue la première phase dans la pathogenèse des candidoses muqueuses. Les protéases aspartiques sécrétées jouent un rôle majeur dans cette première phase mais interviennent aussi dans les processus d’invasion tissulaire, ainsi qu’après, en altérant certains mécanismes de la phagocytose. Au niveau de la muqueuse buccale, le contrôle local de l’infection fongique dépend essentiellement des lymphocytes T CD4 +. En effet, les lymphocytes de type TH1 jouent un rôle majeur en produisant localement les cytokines nécessaires pour stimuler l’activité fongicide des cellules phagocytaires (essentiellement l’interféron-γ) . Au cours de l’infection par le VIH, la diminution du nombre des lymphocytes T CD4+, ainsi que l’évolution de la réponse immunitaire cellulaire de type TH1 vers une réponse de type TH2 prédominante favorisent le développement de candidoses muqueuses. Des mécanismes dépendants du champignon telle que la sécrétion accrue de protéases aspartiques entrent aussi en jeu dans le développement de la pathogénicité de C. albicans sur le terrain VIH. Les connaissances récentes sur la physiopathologie des candidoses muqueuses au cours de l’infection par le VIH permettent aussi de mieux comprendre la chute de l’incidence de cette pathologie depuis l’introduction des inhibiteurs de protéases du VIH dans les trithérapies antirétrovirales. Ces constatations plaident pour le développement d’inhibiteurs spécifiques des protéases aspartiques fongiques dans le traitement des candidoses muqueuses. Candida albicans ( C. albicans ), which is a part of the normal microbial flora, is a yeast-like fungus that colonizes human mucosal surfaces. Adherence to epithelial cells is the first step in the physiopathology of mucosal candidosis. Secreted aspartic proteases play an important role in this first step, but they are also involved in tissue invasion process and in phagocytosis alteration. Cell-mediated immunity initiated by CD4+ T cells is the predominant host defense mechanism against C. albicans infections at mucosal surfaces. TH1 cells play a major role, producing cytokines that activate antifungal function of phagocytic cells (IFN-γ). The reduced CD4 + T cell number and the shift from TH1- to TH2-type response during HIV infection are thought to be important in the development of mucosal candidosis. Other mechanisms, such as increased aspartic proteases secretion, also contribute to the pathogenesis of C. albicans in HIV-positive individuals. Recent studies of Candida pathogenesis in HIV-infection have increased understanding of the dramatically lower rates of oropharyngeal candidosis in individuals receiving HIV protease inhibitor. Therefore, the research on specific aspartic protease inhibitors should be of interest for the treatment of mucosal candidosis." @default.
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- W2051957916 date "2002-12-01" @default.
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- W2051957916 title "Physiopathologie de la candidose oropharyngée au cours de l’infection par le VIH" @default.
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- W2051957916 doi "https://doi.org/10.1016/s0399-077x(02)00458-4" @default.
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