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Regulation of smooth muscle cell proliferation by beta-catenin/T-cell factor signaling involves modulation of cyclin

Helen Quasnichka1, Sadie C Slater, Cressida A Beeching

  • 1Bristol Heart Institute, Level 7, Bristol Royal Infirmary, Upper Maudlin St Bristol, UK.

Circulation Research
|November 24, 2006
PubMed

Insights

Growth factors stimulate vascular smooth muscle cell (VSMC) proliferation by activating beta-catenin/T-cell factor (TCF) signaling. Inhibiting this pathway reduces VSMC proliferation and alters cell cycle gene expression.

Area of Science:

  • Vascular Biology
  • Cell Signaling
  • Molecular Biology

Background:

  • Vascular smooth muscle cell (VSMC) proliferation is crucial for vascular health and disease.
  • Growth factor stimulation of VSMCs involves cadherin junction dynamics and beta-catenin nuclear translocation.
  • The role of beta-catenin/T-cell factor (TCF) signaling in VSMC proliferation requires further elucidation.

Purpose of the Study:

  • To investigate whether beta-catenin/TCF signaling directly regulates VSMC proliferation.
  • To determine if beta-catenin/TCF signaling modulates the expression of cell cycle genes cyclin D1 and p21 in VSMCs.
  • To assess the impact of modulating N-cadherin and beta-catenin/TCF signaling on VSMC proliferation.

Main Methods:

  • Adenoviral-mediated overexpression of N-Cadherin, ICAT, or dominant-negative TCF-4 (dnTCF-4) in primary human VSMCs and saphenous vein medial segments.
  • Assessment of VSMC proliferation rates using cell counting or similar methods.
  • Analysis of beta-catenin/TCF reporter activity, and mRNA and protein levels of cyclin D1 and p21.

Main Results:

  • Overexpression of N-cadherin, ICAT, or dnTCF-4 significantly reduced VSMC proliferation by 45-80%.
  • Inhibition of beta-catenin/TCF signaling decreased cyclin D1 expression and increased p21 expression at both mRNA and protein levels.
  • Reporter assays confirmed that beta-catenin/TCF signaling regulates cyclin D1 and p21 gene activity.

Conclusions:

  • The N-cadherin and beta-catenin/TCF signaling pathway is a key regulator of VSMC proliferation.
  • This pathway modulates VSMC proliferation through the differential regulation of cyclin D1 and p21.
  • Targeting this pathway may offer therapeutic strategies for vascular diseases involving VSMC proliferation.

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