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2017 ; 8
(1
): 1250
Nephropedia Template TP
gab.com Text
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English Wikipedia
E-cadherin integrates mechanotransduction and EGFR signaling to control
junctional tissue polarization and tight junction positioning
#MMPMID29093447
Rübsam M
; Mertz AF
; Kubo A
; Marg S
; Jüngst C
; Goranci-Buzhala G
; Schauss AC
; Horsley V
; Dufresne ER
; Moser M
; Ziegler W
; Amagai M
; Wickström SA
; Niessen CM
Nat Commun
2017[Nov]; 8
(1
): 1250
PMID29093447
show ga
Generation of a barrier in multi-layered epithelia like the epidermis requires
restricted positioning of functional tight junctions (TJ) to the most suprabasal
viable layer. This positioning necessitates tissue-level polarization of
junctions and the cytoskeleton through unknown mechanisms. Using quantitative
whole-mount imaging, genetic ablation, and traction force microscopy and atomic
force microscopy, we find that ubiquitously localized E-cadherin coordinates
tissue polarization of tension-bearing adherens junction (AJ) and F-actin
organization to allow formation of an apical TJ network only in the uppermost
viable layer. Molecularly, E-cadherin localizes and tunes EGFR activity and
junctional tension to inhibit premature TJ complex formation in lower layers
while promoting increased tension and TJ stability in the granular layer 2. In
conclusion, our data identify an E-cadherin-dependent mechanical circuit that
integrates adhesion, contractile forces and biochemical signaling to drive the
polarized organization of junctional tension necessary to build an in vivo
epithelial barrier.