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Smad2 functions as a co-activator of canonical Wnt/beta-catenin signaling pathway independent of Smad4 through histone acetyltransferase activity of p300.

Abstract：

:Both canonical Wnt/beta-catenin and TGFbeta/Smad signaling pathways coordinately regulate pattern formation during embryogenesis as well as tumor progression. Evidence of cross-talk between these two pathways has been reported. Here we demonstrated that the Activin-like kinase 4 (Alk4)/Smad2 pathway facilitates the transcriptional activity of the oncogenic Wnt/beta-catenin/Tcf4 pathway through a novel Smad4-independent mechanism. Upon activation, Smad2 physically interacted with Tcf4, beta-catenin and the co-activator p300 to enhance transcriptional activity of beta-catenin/Tcf4 through the histone acetyltransferase activity of p300. Transactivation by Smad2 was independent of a Smad-binding element (SBE) and Smad4. Indeed, the enhancement of beta-catenin/Tcf4 transcriptional activity by activated Smad2 was negatively regulated by the presence of Smad4. Moreover, a tumor-derived missense mutant of Smad2, lacking the ability to bind to Smad4 was still able to enhance the Tcf4 transcriptional reporter in the presence of beta-catenin and Tcf4. Our findings suggest that Smad2 may function as an activator of canonical Wnt/beta-catenin/Tcf4 signaling through a SBE/Smad4-independent pathway.

journal_name

Cell Signal

journal_title

Cellular signalling

authors

Hirota M,Watanabe K,Hamada S,Sun Y,Strizzi L,Mancino M,Nagaoka T,Gonzales M,Seno M,Bianco C,Salomon DS

doi

10.1016/j.cellsig.2008.05.003

subject

Has Abstract

pub_date

2008-09-01 00:00:00

pages

1632-41

issue

9

eissn

0898-6568

issn

1873-3913

pii

S0898-6568(08)00151-4

journal_volume

20

pub_type

杂志文章

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