Expression of renin-angiotensin system and extracellular matrix genes in cardiovascular cells and its regulation through AT1 receptor.

Published

Journal Article

Angiotensinogen (AGT) is a unique substrate of the renin-angiotensin system and fibronectin (FN) is an important component of the extracellular matrix. These play critical roles in the pathophysiological changes including cardiovascular remodeling and hypertrophy in response to hypertension. This study was performed to examine the regulation of AGT and FN gene in cardiac myocytes (CMs) and vascular smooth muscle cells (VSMCs) in response to mechanical stretch. Mechanical stretch significantly increased the AGT mRNA expression in CMs, while these stimuli did not affect FN mRNA levels. On the other hand, mechanical stretch upregulated FN mRNA levels in VSMCs, whereas no increase in AGT mRNA levels was observed in response to stretch stimuli. An angiotensin II type 1 (AT1) receptor antagonist (CV11974) significantly decreased these stretch-mediated increases in mRNA level and promoter activity of the AGT and FN gene, whereas angiotensin II type 2 (AT2) receptor antagonist (PD 123319) did not affect the induction. These results indicate that mechanical stretch activates transcription of the AGT and FN gene mainly via AT1 receptor-pathway in CMs and VSMCs. Furthermore, mechanisms regulating AGT and FN gene seem to be different between CMs and VSMCs.

Full Text

Duke Authors

Cited Authors

  • Tamura, K; Chen, YE; Chen, Q; Nyui, N; Horiuchi, M; Takasaki, I; Tamura, N; Pratt, RE; Dzau, VJ; Umemura, S

Published Date

  • September 2000

Published In

Volume / Issue

  • 212 / 1-2

Start / End Page

  • 203 - 209

PubMed ID

  • 11108152

Pubmed Central ID

  • 11108152

International Standard Serial Number (ISSN)

  • 0300-8177

Language

  • eng

Conference Location

  • Netherlands