EPB41L5 Functions to Post-transcriptionally Regulate Cadherin and Integrin During Epithelial-mesenchymal Transition

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 2008 Sep 17

PMID 18794329

Citations 56

Authors

Mariko Hirano

Shigeru Hashimoto

Shigenobu Yonemura

Hisataka Sabe

Shinichi Aizawa

Affiliations

Soon will be listed here.

Abstract

EPB41L5 belongs to the band 4.1 superfamily. We investigate here the involvement of EPB41L5 in epithelial-mesenchymal transition (EMT) during mouse gastrulation. EPB41L5 expression is induced during TGFbeta-stimulated EMT, whereas silencing of EPB41L5 by siRNA inhibits this transition. In EPB41L5 mutants, cell-cell adhesion is enhanced, and EMT is greatly impaired during gastrulation. Moreover, cell attachment, spreading, and mobility are greatly reduced by EPB41L5 deficiency. Gene transcription regulation during EMT occurs normally at the mRNA level; EPB41L5 siRNA does not affect either the decrease in E-cadherin or the increase in integrin expression. However, at the protein level, the decrease in E-cadherin and increase in integrin are inhibited in both EPB41L5 siRNA-treated NMuMG cells and mutant mesoderm. We find that EPB41L5 binds p120ctn through its N-terminal FERM domain, inhibiting p120ctn-E-cadherin binding. EPB41L5 overexpression causes E-cadherin relocalization into Rab5-positive vesicles in epithelial cells. At the same time, EPB41L5 binds to paxillin through its C terminus, enhancing integrin/paxillin association, thereby stimulating focal adhesion formation.

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