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<dc:title xml:lang="fr">Rôle du canal calcique de type T Cav3.2 dans les cellules cancéreuses prostatiques humaines</dc:title>
<dcterms:alternative xml:lang="en">Function of Cav3.2-T-type in human prostatic cancer cells</dcterms:alternative>
<dc:subject xml:lang="fr">Canaux calciques voltage-dépendants</dc:subject>
<dc:subject xml:lang="fr">Cellules neuroendocrines</dc:subject>
<dc:subject xml:lang="fr">Homéostasie calcique</dc:subject>
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<tef:elementdEntree autoriteExterne="035048573" autoriteSource="Sudoc">Système neuro-endocrinien</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027256871" autoriteSource="Sudoc">Prostate -- Cancer</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="050562053" autoriteSource="Sudoc">Prolifération cellulaire</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="031450156" autoriteSource="Sudoc">Canaux potassiques</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027730263" autoriteSource="Sudoc">Cellules cancéreuses -- Croissance</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027798003" autoriteSource="Sudoc">Calcium</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="050819976" autoriteSource="Sudoc">Phosphatase acide</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Le cancer de la prostate évolue progressivement vers l'androgéno-indépendance, stade incurable pour lequel la recherche biomédicale tente de déterminer de nouvelles cibles thérapeutiques. Cette évolution est marquée par une différenciation neuroendocrine des cellules prostatiques qui s'accompagne d'une surexpression de canaux calciques voltage-dépendants de type T (Cav3.2) responsable d'une altération de l'homéostasie calcique intracellulaire. L'objectif de cette thèse était donc de déterminer l'implication des Cav3.2 dans les cellules cancéreuses prostatiques humaines, et notamment dans les cellules neuroendocrines. Nos résultats montrent que, dans ces cellules non-excitables, les Cav3.2 participent à l'homéostasie calcique en permettant une entrée basale de calcium au potentiel de repos sans contribuer à une entrée capacitive de calcium provoquée par la vidange des réserves intracellulaires de calcium. De plus, ces canaux interviennent dans la sécrétion de la Phosphatase Acide Prostatique, un marqueur des cellules épithéliales prostatiques, dans les cellules neuroendocrines. Par ailleurs, nous montrons l'existence d'un couplage fonctionnel entre les Cav3.2 et les canaux de type BK qui constituent les principales conductances potassiques voltage-dépendantes des cellules prostatiques. Enfin, nos travaux mettent en évidence que ce couplage entre ces deux canaux participe à la prolifération cellulaire des cellules cancéreuses prostatiques. En conclusion, ce travail de thèse contribue à élargir les connaissances sur les canaux calciques de type T, Cav3.2 en particulier, et leur rôle au sein des cellules prostatiques cancéreuses humaines</dcterms:abstract>
<dcterms:abstract xml:lang="en">Prostate cancer inevitably evolves towards an incurable androgen-independent stage for which biomedical research attempts to identity new therapeutic targets. This progression is characterized by a neuroendocrine differentiation of prostate cells accompanied by an overexpression of voltage-dependent T-type calcium channels (Cav3.2), responsible for an alteration of intracellular calcium homeostasis. The aim of this PhD thesis was to determine the involvement of Cav3.2 in human prostate cancer cells, mainly in neuroendocrine cells. Our results show that, in these non-excitable cells, Cav3.2 channels participate to basal calcium homeostasis by promoting calcium entry at resting membrane potential without contributing to the capacitative calcium entry triggered by calcium depletion from endoplasmic reticulum stores. ln addition, these channels are involved in the secretion of Prostatic Acid Phosphatase, a marker of prostatic epithelial cells, in neuroendocrine cells. Furthermore, we show that Cav3.2 channels are functionaly coupled to BK channels which constitute the main voltage-dependent potassium conductances in prostate cells. Finally, our work demonstrates that this coupling between both channels regulates prostate cancer cell proliferation. As a conclusion, this work contributes to the understanding of the role of Cav3.2 T-type calcium channels in human prostate cancer cells.</dcterms:abstract>
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<dc:title xml:lang="">A role for voltage gated T-type calcium channels in mediating "capacitive" calcium entry ?</dc:title>
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