title: Direct binding of estradiol enhances Slack (sequence like a calcium-activated potassium channel) channels' activity.
abstract: 17Beta-estradiol (E2) is a major neuroregulator, exerting both genomic and non-genomic actions. E2 regulation of Slack (sequence like a calcium-activated potassium channel) potassium channels has not been identified in the CNS. We demonstrate E2-induced activation of Slack channels, which display a unitary conductance of about 60 pS, are inhibited by intracellular calcium, and are abundantly expressed in the nervous system. In lipid bilayers derived from rat cortical neuronal membranes, E2 increases Slack open probability and appears to decrease channel inactivation. Additionally, E2 binds to the Slack channel and activates outward currents in human embryonic kidney-293 cells that express Slack channels but not classical estrogen receptors (i.e. ERalpha or ERbeta). Neither E2-induced activation nor the binding intensity of E2 to the Slack channel is blocked by tamoxifen, an ER antagonist/agonist. Thus, E2 activates a potassium channel, Slack, through a non-traditional membrane binding site, adding to known non-genomic mechanisms by which E2 exerts pharmacological and toxicological effects in the CNS.
authors.affiliation: Behavioral Endocrinology Branch, NIMH/NIH, Building 10, Room 65340, MSC 1276, Bethesda, MD 20892-1276, USA. lezhang@usuhs.mil
authors.forename: L
authors.initials: L
authors.lastname: Zhang
authors.forename: M
authors.initials: M
authors.lastname: Sukhareva
authors.forename: J L
authors.initials: JL
authors.lastname: Barker
authors.forename: D
authors.initials: D
authors.lastname: Maric
authors.forename: Y
authors.initials: Y
authors.lastname: Hao
authors.forename: Y H
authors.initials: YH
authors.lastname: Chang
authors.forename: W
authors.initials: W
authors.lastname: Ma
authors.forename: T
authors.initials: T
authors.lastname: O'Shaughnessy
authors.forename: D R
authors.initials: DR
authors.lastname: Rubinow
mesh_terms: D000818:Animals; D002460:Cell Line; D004305:Dose-Response Relationship, Drug; D004958:Estradiol / Q000378:metabolism*; D006801:Humans; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism*; D009474:Neurons / Q000378:metabolism; D015221:Potassium Channels / Q000235:genetics / Q000378:metabolism*; D000081033:Potassium Channels, Sodium-Activated; D011485:Protein Binding / Q000502:physiology
chemical_list: D009419:Nerve Tissue Proteins; D015221:Potassium Channels; D000081033:Potassium Channels, Sodium-Activated; C000626167:kcnt1 protein, rat; D004958:Estradiol