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The roles of membrane estrogen receptor subtypes in modulating dopamine transporters in PC‐12 cells
Author(s) -
Alyea Rebecca A.,
Laurence Stephanie E.,
Kim Sung H.,
Katzenellenbogen Benita S.,
Katzenellenbogen John A.,
Watson Cheryl S.
Publication year - 2008
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1111/j.1471-4159.2008.05491.x
Subject(s) - efflux , gper , estrogen receptor , gene knockdown , microbiology and biotechnology , receptor , endocrinology , medicine , biology , chemistry , biochemistry , apoptosis , cancer , breast cancer
The effects of 17β‐estradiol (E 2 ) on dopamine (DA) transport could explain gender and life‐stage differences in the incidence of some neurological disorders. We tested the effects of E 2 at physiological concentrations on DA efflux in nerve growth factor‐differentiated rat pheochromocytoma cells that express estrogen receptors (ER) α, ERβ, and G‐protein coupled receptor 30 (GPR30), and DA transporter (DAT). DAT efflux was determined as the transporter‐specific loss of 3 H‐DA from pre‐loaded cells; a 9–15 min 10 −9  M E 2 treatment caused maximal DA efflux. Such rapid estrogenic action suggests a non‐genomic response, and an E 2 ‐dendrimer conjugate (limited to non‐nuclear actions) caused DA efflux within 5 min. Efflux dose–responses for E 2 were non‐monotonic, also characteristic of non‐genomic estrogenic actions. ERα siRNA knockdown abolished E 2 ‐mediated DA efflux, while ERβ knockdown did not, and GPR30 knockdown increased E 2 ‐mediated DA efflux (suggesting GPR30 is inhibitory). Use of ER‐selective agonists/antagonists demonstrated that ERα is the predominant mediator of E 2 ‐mediated DA efflux, with inhibitory contributions from GPR30 and ERβ. E 2 also caused trafficking of ERα to the plasma membrane, trafficking of ERβ away from the plasma membrane, and unchanged membrane GPR30 levels. Therefore, ERα is largely responsible for non‐genomic estrogenic effects on DAT activity.

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