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Maria Gomez

Maria Gomez

Professor

Maria Gomez

Molecular Mechanisms of Collagen Isotype-Specific Modulation of Smooth Muscle Cell Phenotype.

Author

  • A Wayne Orr
  • Monica Y Lee
  • Julia A Lemmon
  • Arif Yurdagul
  • Maria Gomez
  • Pamela D Schoppee Bortz
  • Brian R Wamhoff

Summary, in English

OBJECTIVE: Smooth muscle cell (SMC) phenotypic modulation, an important component of atherosclerosis progression, is critically regulated by the matrix, with normal components of the healthy SMC matrix limiting modulation and atherosclerosis-associated transitional matrix proteins promoting phenotypic modulation. We sought to determine how collagen IV (which comprises the healthy artery wall) and monomeric collagen I (which comprises atherosclerotic lesions) differentially affect SMC phenotype. METHODS AND RESULTS: Plating SMCs on collagen IV resulted in elevated expression of SMC contractility proteins compared to collagen I. Concurrent with enhanced contractile gene expression, collagen IV stimulates binding of SRF to CArG boxes in the promoters of smooth muscle actin and smooth muscle myosin heavy chain. Coll IV also stimulated the expression of myocardin, a critical SRF coactivator required to drive expression of SMC specific genes. In contrast to collagen IV, collagen I stimulated enhanced expression of the inflammatory protein vascular cell adhesion molecule (VCAM)-1. NF-kappaB and NFAT-binding sites in the VCAM-1 promoter are critical for collagen I-mediated expression of VCAM-1 promoter activity. However, only inhibitors of NFAT, not NF-kappaB, were able to reduce collagen I-associated VCAM expression, and collagen I but not collagen IV stimulated NFAT transcriptional activity. CONCLUSIONS: These results show for the first time that collagen IV and collagen I differentially affect smooth muscle phenotypic modulation through multiple pathways.

Department/s

  • Cardiovascular Research - Immunity and Atherosclerosis

Publishing year

2009

Language

English

Pages

225-231

Publication/Series

Arteriosclerosis, Thrombosis and Vascular Biology

Volume

Nov 20

Document type

Journal article

Publisher

Lippincott Williams & Wilkins

Topic

  • Cardiac and Cardiovascular Systems

Status

Published

Research group

  • Cardiovascular Research - Immunity and Atherosclerosis

ISBN/ISSN/Other

  • ISSN: 1524-4636