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Developmental regulation of apical endocytosis controls epithelial patterning in vertebrate tubular organs

AuthorsRodríguez-Fraticelli, Alejo E. ; Bosch-Fortea, Minnerva; Reglero-Real, Natalia ; García-León, María J. ; Toribio, María Luisa ; Alonso, Miguel A. ; Millán, J. ; Bagnat, Michel; Martín-Belmonte, Fernando
Issue Date23-Feb-2015
CitationNature Cell Biology 17: 241- 250 (2015)
Abstract© 2015 Macmillan Publishers Limited. Epithelial organs develop through tightly coordinated events of cell proliferation and differentiation in which endocytosis plays a major role. Despite recent advances, how endocytosis regulates the development of vertebrate organs is still unknown. Here we describe a mechanism that facilitates the apical availability of endosomal SNARE receptors for epithelial morphogenesis through the developmental upregulation of plasmolipin (pllp) in a highly endocytic segment of the zebrafish posterior midgut. The protein PLLP (Pllp in fish) recruits the clathrin adaptor EpsinR to sort the SNARE machinery of the endolysosomal pathway into the subapical compartment, which is a switch for polarized endocytosis. Furthermore, PLLP expression induces apical Crumbs internalization and the activation of the Notch signalling pathway, both crucial steps in the acquisition of cell polarity and differentiation of epithelial cells. We thus postulate that differential apical endosomal SNARE sorting is a mechanism that regulates epithelial patterning.
Identifiersdoi: 10.1038/ncb3106
issn: 1476-4679
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