Wt1 Negatively Regulates Beta-catenin Signaling During Testis Development

Overview

Journal Development

Specialty Biology

Date 2008 Apr 12

PMID 18403409

Citations 76

Authors

Hao Chang

Fei Gao

Florian Guillou

Makoto M Taketo

Vicki Huff

Richard R Behringer

Affiliations

Soon will be listed here.

Abstract

beta-Catenin, as an important effector of the canonical Wnt signaling pathway and as a regulator of cell adhesion, has been demonstrated to be involved in multiple developmental processes and tumorigenesis. beta-Catenin expression was found mainly on the Sertoli cell membrane starting from embryonic day 15.5 in the developing testes. However, its potential role in Sertoli cells during testis formation has not been examined. To determine the function of beta-catenin in Sertoli cells during testis formation, we either deleted beta-catenin or expressed a constitutively active form of beta-catenin in Sertoli cells. We found that deletion caused no detectable abnormalities. However, stabilization caused severe phenotypes, including testicular cord disruption, germ cell depletion and inhibition of Müllerian duct regression. beta-Catenin stabilization caused changes in Sertoli cell identity and misregulation of inter-Sertoli cell contacts. As Wt1 conditional knockout in Sertoli cells causes similar phenotypes to our stabilized beta-catenin mutants, we then investigated the relationship of Wt1 and beta-catenin in Sertoli cells and found Wt1 inhibits beta-catenin signaling in these cells during testis development. Wt1 deletion resulted in upregulation of beta-catenin expression in Sertoli cells both in vitro and in vivo. Our study indicates that Sertoli cell expression of beta-catenin is dispensable for testis development. However, the suppression of beta-catenin signaling in these cells is essential for proper testis formation and Wt1 is a negative regulator of beta-catenin signaling during this developmental process.

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