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Rôle de la GTPase golgienne RAB6 dans la fonction du lignage sécrétoire mammaire

Abstract : The two ubiquitous isoforms of the RAB6 GTPase, RAB6A and RAB6A’, are associated with Golgi membranes and regulate anterograde and retrograde transport pathways from and to the Golgi. In vitro, RAB6A/A’ have been reported to be involved in several cellular functions, including, in addition to transport, cell division, migration, adhesion and polarity. However, their role remains poorly described in vivo, in particular in epithelial tissues. Here, we generated BlgCre; Rab6aF/F mouse presenting a specific deletion of Rab6a in the mammary luminal secretory lineage during gestation and lactation. Rab6a loss severely impaired the differentiation, maturation and maintenance of the secretory tissue, compromising lactation. It led to a decreased activation of STAT5, a key regulator of the lactogenic process primarily governed by prolactin. Additional data obtained with a human mammary epithelial cell line suggested that defective STAT5 activation might originate from a perturbed transport of the prolactin receptor, altering its membrane expression and signaling cascade. Despite the major functional defects observed upon Rab6a deletion, the polarized organization of the mammary epithelial bilayer was preserved. Altogether, our data reveal a crucial role for RAB6A/A’ in the lactogenic function of the mammary gland. They also suggest that trafficking pathways controlled by RAB6A/A’ depend on cell type specialization and tissue context.
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Surya Cayre. Rôle de la GTPase golgienne RAB6 dans la fonction du lignage sécrétoire mammaire. Biologie cellulaire. Université Paris sciences et lettres, 2020. Français. ⟨NNT : 2020UPSLT001⟩. ⟨tel-03174868⟩

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