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Regulation of smooth muscle cell proliferation by beta-catenin/T-cell factor signaling involves modulation of cyclin D1 and p21 expression.

Abstract：

:We previously observed that stimulation of vascular smooth muscle cell (VSMC) proliferation with growth factors is associated with dismantling of cadherin junctions and nuclear translocation of beta-catenin. In this study we demonstrate directly that growth factors stimulate beta-catenin/T-cell factor (TCF) signaling in primary VSMCs. To determine whether beta-catenin/TCF signaling regulates VSMC proliferation via modulation of the beta-catenin/TCF responsive cell cycle genes, cyclin D1 and p21, we inhibited beta-catenin/TCF signaling by adenoviral-mediated over-expression of N-Cadherin, ICAT (an endogenous inhibitor of beta-catenin/TCF signaling), or a dominant negative (dn) mutant of TCF-4. N-cadherin, ICAT or dnTCF-4 over-expression significantly reduced proliferation of isolated human VSMCs by approximately 55%, 80%, and 45% respectively. Similar effects were observed in human saphenous vein medial segments where proliferation was reduced by approximately 55%. Transfection of dnTCF-4 in the ISS10 human VSMC line significantly lowered TCF and cyclin D1 reporter activity but significantly elevated p21 reporter activity, indicating regulation of these genes by beta-catenin/TCF signaling. In support of this, over-expression of N-cadherin, ICAT or dnTCF-4 in isolated human VSMCs significantly lowered levels of cyclin D1 mRNA and protein levels. In contrast, over-expression of N-Cadherin, ICAT or dnTCF4 significantly elevated p21 mRNA and protein levels. In summary, we have demonstrated that increasing N-cadherin and inhibiting beta-catenin/TCF signaling reduces VSMC proliferation, decreases the expression of cyclin D1 and increases levels of the cell cycle inhibitor, p21. We therefore suggest that the N-cadherin and beta-catenin/TCF signaling pathway is a key modulator of VSMC proliferation via regulation of these 2 beta-catenin/TCF responsive genes.

journal_name

Circ Res

journal_title

Circulation research

authors

Quasnichka H,Slater SC,Beeching CA,Boehm M,Sala-Newby GB,George SJ

doi

10.1161/01.RES.0000253533.65446.33

subject

Has Abstract

pub_date

2006-12-08 00:00:00

pages

1329-37

issue

eissn

0009-7330

issn

1524-4571

pii

01.RES.0000253533.65446.33

journal_volume

pub_type

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Regulation of smooth muscle cell proliferation by beta-catenin/T-cell factor signaling involves modulation of cyclin D1 and p21 expression.