RT Journal Article
SR Electronic
T1 Rapid, Estrogen Receptor–Mediated Signaling: Why Is the Endothelium So Special?
JF Science's STKE
JO Sci. STKE
FD American Association for the Advancement of Science
SP pe28
OP pe28
DO 10.1126/stke.2882005pe28
VO 2005
IS 288
A1 Kim, Kyung Hee
A1 Bender, Jeffrey R.
YR 2005
UL http://stke.sciencemag.org/content/2005/288/pe28.abstract
AB Classical, ligand-activated genomic effects of estrogen receptors (ERs) were once thought to mediate all estrogen responses. It is now accepted that rapid, nongenomic responses, mediated by ER-containing membrane complexes, occur in many tissues. The endothelium is a major target of such responses and is the critical regulatory tissue that, when normally functional, determines a state of "vascular health." When dysfunctional, the phenotypic and functional alterations result in vascular pathology, the most common form of which is atherosclerosis. Nitric oxide (NO) is a vascular protective substance generated by endothelial NO synthase (eNOS) in endothelial cells. The engagement of membrane ERs by 17β-estradiol (E2) is a potent stimulus to eNOS activation and NO release. Here, we describe the multimolecular components of ER-containing membrane complex assembly and the mechanisms directing ER targeting to caveolae microdomains in the plasma membrane. We discuss the possibility that various ERα splice forms, expressed in endothelial cells, may be particularly efficient signal transducers and may use classical receptor domains for membrane targeting and insertion. Finally, we discuss the biomedical ramifications of ER-mediated endothelial activation, including the controversies surrounding hormone replacement therapy and cardiovascular disease.