期刊
CIRCULATION RESEARCH
卷 95, 期 3, 页码 269-275出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/01.RES.0000136521.70093.f1
关键词
estrogen receptors; plasminogen activator inhibitor-1 promoter; estrogen response element; bovine aortic endothelial cell
资金
- NHLBI NIH HHS [T32-HL007411, HL51387, HL65192] Funding Source: Medline
To investigate the molecular mechanisms involved in the estrogen-dependent control of plasminogen activator inhibitor-1 (PAI-1) gene expression in vascular cells, we compared the transactivation properties of estrogen receptors (ERalpha and ERbeta) in regulating the activity of a human PAI-1 promoter reporter construct in transfected bovine aortic endothelial cells (BAECs). ERalpha increased PAI-1 promoter activity in BAECs by an estrogen-dependent mechanism, whereas ERbeta suppressed PAI-1 promoter activity by an estrogen-independent mechanism. The suppressive activity of ERbeta was dominant over the inductive activity of ERalpha. Mutation of a putative estrogen response element ( ERE) located at position -427 in the proximal promoter abolished the ERalpha action without influencing the suppressive effects of ERbeta. Mutation of either AP1-like site did not eliminate the ERalpha or ERbeta actions at the PAI-1 promoter, suggesting that other promoter elements are involved in these responses. These mutations significantly reduced the -3.4kbp PAI-1 promoter response to serum. We concluded that ERalpha and ERbeta exert differential effects on the PAI-1 promoter activity in transfected BAECs. ERalpha activated the PAI-1 promoter through a proximal ERE (-427) and possibly additional EREs located within the PAI-1 promoter, whereas ERbeta suppressed the promoter construct via an unidentified mechanism. This is the first demonstration of the differential regulation of a vascular gene promoter by ERalpha and ERbeta.
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