Estrogen increases expression of the human prostacyclin receptor within the vasculature through an ERα-dependent mechanism

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Title: Estrogen increases expression of the human prostacyclin receptor within the vasculature through an ERα-dependent mechanism
Authors: Turner, Elizebeth C.
Kinsella, B. Therese
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Date: 26-Feb-2010
Online since: 2011-09-21T15:26:35Z
Abstract: Prostacyclin and the prostacyclin receptor (IP) are implicated in mediating many of the atheroprotective effects of estrogen in both humans and in animal models but through unknown mechanisms. Hence, herein the influence of estrogen on IP gene expression in endothelial EA.hy926, human erythroleukemia 92.1.7 and primary human (h) aortic smooth muscle (1o hAoSM) cells was investigated. Estrogen increased hIP mRNA levels, promoter (PrmIP)-directed reporter gene expression and cicaprost-dependent cAMP generation in all cell types, effects that were abrogated by actinomycinD and the general estrogen receptor (ER)-α/ERβ antagonist ICI 182,780. Furthermore, the ERα-selective agonist 4,4’,4”-(4-Propyl-[1H]-pyrazole-1,3,5-triyl)trisphenol (PPT), but not the ERβ-agonist 2,3-bis(4-Hydroxyphenly)-propionitrile, significantly increased hIP mRNA and PrmIP-directed gene expression. Deletional and mutational analysis of PrmIP uncovered an evolutionary conserved estrogen-response element (ERE) while electrophoretic mobility shift, antibody-supershift and chromatin immunoprecipitations assays confirmed the direct binding of ERα, but not ERβ, to PrmIP both in vitro and in vivo. Moreover, immunofluorescence microscopy corroborated that estrogen and PPT increased hIP expression in 1o hAoSMCs. In conclusion, the hIP gene is directly regulated by estrogen that largely occurs through an ERα-dependent transcriptional mechanism and thereby provides critical insights into the role of prostacyclin/hIP in mediating the atheroprotective effects of estrogen within the human vasculature.
Funding Details: Science Foundation Ireland
Health Research Board
Type of material: Journal Article
Publisher: Elsevier
Journal: Journal of Molecular Biology
Volume: 396
Issue: 3
Start page: 473
End page: 486
Copyright (published version): 2010 Elsevier Ltd
Keywords: Prostacyclin receptorEstrogenGene expressionTranscriptionEstrogen-response element (ERE)Promoter
Subject LCSH: Prostacyclin--Receptors
Gene expression
Transcription factors
Promoters (Genetics)
DOI: 10.1016/j.jmb.2010.01.010
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Language: en
Status of Item: Peer reviewed
Appears in Collections:Conway Institute Research Collection
Biomolecular and Biomedical Science Research Collection

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