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This Article Full Text Full Text (PDF) All Versions of this Article: 292/6/H2607    most recent 01107.2006v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (4) Citing Articles via Google Scholar Google Scholar Articles by Xing, D. Articles by Oparil, S. Search for Related Content PubMed PubMed Citation Articles by Xing, D. Articles by Oparil, S.

Estrogen modulates TNF--induced inflammatory responses in rat aortic smooth muscle cells through estrogen receptor- activation

¹Vascular Biology and Hypertension Program, Division of Cardiovascular Disease, Department of Medicine, ²Department of Physiology and Biophysics, and ³Department of Anatomic Pathology, University of Alabama at Birmingham, Birmingham, Alabama

Submitted 10 October 2006 ; accepted in final form 19 January 2007

We have previously shown that 17-estradiol (E2) attenuates responses to endoluminal injury of the rat carotid artery, at least in part, by decreasing inflammatory mediator expression and neutrophil infiltration into the injured vessel, with a major effect on the neutrophil-specific chemokine cytokine-induced neutrophil chemoattractant (CINC)-2. Current studies tested the hypothesis that activated rat aortic smooth muscle cells (RASMCs) express these same inflammatory mediators and induce neutrophil migration in vitro and that E2 inhibits these processes by an estrogen receptor (ER)-dependent mechanism. Quiescent RASMCs treated with E2, the ER-selective agonist propyl pyrazole triol (PPT), the ER-selective agonist diarylpropiolnitrile (DPN), or vehicle for 24 h were stimulated with tumor necrosis factor (TNF)- and processed for real-time RT-PCR, ELISA, or chemotaxis assays 6 h later. TNF- stimulated and E2 attenuated mRNA expression of inflammatory mediators, including P-selectin, intercellular adhesion molecule (ICAM)-1, vascular cell adhesion molecule (VCAM)-1, monocyte chemoattractant protein (MCP)-1, and CINC-2. DPN dose dependently attenuated TNF--induced mRNA expression of CINC-2, whereas PPT had no effect. The anti-inflammatory effects of DPN and E2 were blocked by the nonselective ER-inhibitor ICI-182,780. ELISA confirmed the TNF--induced increase and E2-induced inhibition of CINC-2 protein secretion. TNF- treatment of RASMCs produced a twofold increase in neutrophil chemotactic activity of conditioned media; E2 and DPN treatment markedly inhibited this effect. E2 inhibits activated RASMC proinflammatory mediator expression and neutrophil chemotactic activity through an ER-dependent mechanism.

inflammation; vascular smooth muscle cell; arteries

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