Lee, DY Chai, YG Lee, EB Kim, KW Nah, SY Oh, TH Rhim, H 2024-01-21T11:01:34Z 2024-01-21T11:01:34Z 2021-09-05 2002-03-15 0024-3205 https://pubs.kist.re.kr/handle/201004/139684 There is increasing evidence that estrogen influences electrical activity of neurons via stimulation of membrane receptors. Although the presence of intracellular estrogen receptors and their responsiveness in dorsal root ganglion (DRG) primary sensory neurons were reported, rapid electrical responses of estrogen in DRG neurons have not been reported yet. Therefore the current study was initiated to examine the rapid effects of estrogen on Ca2+ channels and to determine its detailed mechanism in female rat DRG neurons using whole-cell patch-clamp recordings. Application of 17beta-estradiol (1 muM) caused a rapid inhibition on high-voltage-activated (HVA)-, but not on low-voltage-activated (LVA)Ca2+ currents. This rapid estrogen-mediated inhibition was reproducible and dose-dependent. This effect was also sex- and stereo-specific; it was greater in cells isolated from intact female rats and was more effective than that of 17alpha-estradiol, the stereoisomer of the endogenous 17beta-estradiol. In addition, ovariectomy reduced the inhibition significantly but this effect was restored by administration of estrogen in ovariectomized subjects. Occlusion experiments using selective blockers revealed 17beta-estradiol mainly targeted on both L- and N-type Ca2+ currents. Overnight treatment of cells with pertussis toxin profoundly reduced 17beta-estradiol-mediated inhibition of the currents. On the other hand, estradiol conjugated to bovine serum albumin (EST-BSA) produced a similar extent of inhibition as 17beta-estradiol did. These results suggest that 17beta-estradiol can modulate L- and N-type HVA Ca2+ channels in rat DRG neurons via activation of per-tussis toxin-sensitive G-protein(s) and non-genomic pathways. It is likely that such effects are important in estrogen-mediated modulation of sensory functions at peripheral level. (C) 2002 Elsevier Science Inc. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD DORSAL-ROOT GANGLION ESTROGEN-RECEPTOR-ALPHA VASCULAR SMOOTH-MUSCLE PROTEIN-KINASE MESSENGER-RNA CELLS EXPRESSION MEMBRANE BETA CONTRACTILITY 17 beta-Estradiol inhibits high-voltage-activated calcium channel currents in rat sensory neurons via a non-genomic mechanism Article 10.1016/S0024-3205(01)01534-X 1 LIFE SCIENCES, v.70, no.17, pp.2047 - 2059 LIFE SCIENCES 70 17 2047 2059 scie scopus 000175340700009 2-s2.0-0037085714 Medicine, Research & Experimental Pharmacology & Pharmacy Research & Experimental Medicine Pharmacology & Pharmacy Article DORSAL-ROOT GANGLION ESTROGEN-RECEPTOR-ALPHA VASCULAR SMOOTH-MUSCLE PROTEIN-KINASE MESSENGER-RNA CELLS EXPRESSION MEMBRANE BETA CONTRACTILITY estrogen membrane receptor patch-clamp Ca2+ current pertussis toxin sensory neurons