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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Cell+Biol
2015 ; 17
(3
): 241-50
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Developmental regulation of apical endocytosis controls epithelial patterning in
vertebrate tubular organs
#MMPMID25706235
Rodríguez-Fraticelli AE
; Bagwell J
; Bosch-Fortea M
; Boncompain G
; Reglero-Real N
; García-León MJ
; Andrés G
; Toribio ML
; Alonso MA
; Millán J
; Perez F
; Bagnat M
; Martín-Belmonte F
Nat Cell Biol
2015[Mar]; 17
(3
): 241-50
PMID25706235
show ga
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.