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A crosstalk between TGF-β/Smad3 and Wnt/β-catenin pathways promotes vascular smooth muscle cell proliferation.

Abstract：

RATIONALE:Endovascular interventions performed for atherosclerotic lesions trigger excessive vascular smooth muscle cell (SMC) proliferation leading to intimal hyperplasia. Our previous studies show that following endovascular injury, elevated TGF-β/Smad3 promotes SMC proliferation and intimal hyperplasia. Furthermore in cultured SMCs, elevated TGF-β/Smad3 increases the expression of several Wnt genes. Here we investigate a crosstalk between TGF-β/Smad3 and Wnt/β-catenin signaling and its role in SMC proliferation. METHODS AND RESULTS:To mimic TGF-β/Smad3 up-regulation in vivo, rat aortic SMCs were treated with Smad3-expressing adenovirus (AdSmad3) or AdGFP control followed by stimulation with TGF-β1 (or solvent). AdSmad3/TGF-β treatment up-regulated Wnt2b, Wnt4, Wnt5a, Wnt9a, and Wnt11 (confirmed by qRT-PCR and ELISA), and also increased β-catenin protein as detected by Western blotting. Blocking Wnt signaling using a Frizzled receptor inhibitor (Niclosamide) abolished TGF-β/Smad3-induced β-catenin stabilization. Increasing β-catenin through degradation inhibition (using SKL2001) or by adenoviral expression enhanced SMC proliferation. Furthermore, application of recombinant Wnt2b, Wnt4, Wnt5a, or Wnt9a, but not Wnt11, stabilized β-catenin and stimulated SMC proliferation as well. In addition, increased β-catenin was found in the neointima of injured rat carotid artery where TGF-β and Smad3 are known to be up-regulated. CONCLUSIONS:These results suggest a novel mechanism whereby elevated TGF-β/Smad3 stimulates the secretion of canonical Wnts which in turn enhances SMC proliferation through β-catenin stabilization. This crosstalk between TGF-β/Smad3 and Wnt/β-catenin canonical pathways provides new insights into the pathophysiology of vascular SMCs linked to intimal hyperplasia.

journal_name

Cell Signal

journal_title

Cellular signalling

authors

DiRenzo DM,Chaudhary MA,Shi X,Franco SR,Zent J,Wang K,Guo LW,Kent KC

doi

10.1016/j.cellsig.2016.02.011

subject

Has Abstract

pub_date

2016-05-01 00:00:00

pages

498-505

issue

5

eissn

0898-6568

issn

1873-3913

pii

S0898-6568(16)30036-5

journal_volume

28

pub_type

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