TY - JOUR T1 - Estrogen Receptor α Mediates Acute Potassium Channel Stimulation in Human Coronary Artery Smooth Muscle Cells JF - Journal of Pharmacology and Experimental Therapeutics JO - J Pharmacol Exp Ther SP - 1025 LP - 1030 DO - 10.1124/jpet.105.093542 VL - 316 IS - 3 AU - Guichun Han AU - Xiuping Yu AU - Luo Lu AU - Shuyi Li AU - Handong Ma AU - Shu Zhu AU - Xiuyun Cui AU - Richard E. White Y1 - 2006/03/01 UR - http://jpet.aspetjournals.org/content/316/3/1025.abstract N2 - The pleiotropic effects of estrogen are mediated via stimulation of two estrogen receptor (ER) subtypes, ERα and ERβ. Although a number of studies have identified expression of one or both subtypes in estrogen target tissues, fewer studies have correlated ER expression with a functional role of these proteins in regulating cellular excitability. In the present study, we have combined cellular fluorescence, immunocytochemistry, and molecular expression techniques with single-channel patch-clamp studies to determine which ER mediates estrogen-stimulated potassium channel activity in human coronary artery smooth muscle cells (HCASMC). We had demonstrated previously that estrogen stimulates activity of the large-conductance, calcium- and voltage-activated potassium (BKCa) channel in HCASMC via a nongenomic mechanism. We now demonstrate expression of both ERα and ERβ subtypes in HCASMC. Functionally, however, expression of ERα antisense plasmid abolished the acute effect of estrogen on these channels, whereas estrogen retained its ability to stimulate BKCa channels in cells transfected with only green fluorescence protein. In contrast, overexpression of ERα enhanced the stimulatory action of estrogen in HCASMC. Transfection with ERα antisense/sense plasmid did not alter ERβ expression. These findings indicate that the ERα isoform mediates estrogen-induced stimulation of BKCa channels in HCASMC and thereby provide evidence for a receptor-dependent signaling mechanism that can mediate estrogen-induced inhibition of cellular excitability. ER -