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GATA-6 is involved in PPARgamma-mediated activation of differentiated phenotype in human vascular smooth muscle cells

Mitsuru Abe1, Koji Hasegawa, Hiromichi Wada

  • 1Department of Cardiovascular Medicine, Graduate School of Medicine, Kyoto University, 54 Kawara-cho, Shogoin, Sakyo-ku, Kyoto, 606-8507, Japan.

Arteriosclerosis, Thrombosis, and Vascular Biology
|March 5, 2003
PubMed
Abstract

Insights

Activation of Peroxisome proliferator-activated receptor-gamma (PPARgamma) in vascular smooth muscle cells (VSMCs) promotes cell differentiation. This process involves the transcription factor GATA-6, highlighting a novel mechanism for controlling VSMC phenotype.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cardiovascular Research

Background:

  • Peroxisome proliferator-activated receptor-gamma (PPARgamma) is a nuclear receptor influencing cell growth and differentiation.
  • PPARgamma activation inhibits human vascular smooth muscle cell (VSMC) growth, but the underlying mechanism remains unclear.
  • GATA-6, a zinc finger transcription factor, is crucial for maintaining the differentiated state in VSMCs.

Purpose of the Study:

  • To elucidate the mechanism by which PPARgamma activation induces differentiation in VSMCs.
  • To investigate the role of GATA-6 in PPARgamma-mediated VSMC differentiation.

Main Methods:

  • Treatment of VSMCs with PPARgamma ligands (15d-PGJ2 and troglitazone).
  • Assessment of differentiated VSMC markers (smooth muscle myosin heavy chain, alpha-actin).
  • Analysis of smooth muscle myosin heavy chain promoter activity using wild-type and mutant constructs.
  • Measurement of GATA-6 DNA binding activity.

Main Results:

  • PPARgamma ligands induced key markers of VSMC differentiation.
  • Ligand treatment enhanced the activity of the smooth muscle myosin heavy chain promoter, dependent on a GATA-6 binding site.
  • Both tested PPARgamma ligands increased GATA-6 DNA binding activity in VSMCs.

Conclusions:

  • PPARgamma activation drives VSMC differentiation through a GATA-6-dependent transcriptional pathway.
  • This study identifies a novel mechanism involving GATA-6 in PPARgamma-mediated VSMC phenotype regulation.

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