The roles of membrane estrogen receptor subtypes in modulating dopamine transporters in PC-12 cells

J Neurochem. 2008 Aug;106(4):1525-33. doi: 10.1111/j.1471-4159.2008.05491.x. Epub 2008 May 19.


The effects of 17beta-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) alpha, ERbeta, 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. ERalpha siRNA knockdown abolished E(2)-mediated DA efflux, while ERbeta knockdown did not, and GPR30 knockdown increased E(2)-mediated DA efflux (suggesting GPR30 is inhibitory). Use of ER-selective agonists/antagonists demonstrated that ERalpha is the predominant mediator of E(2)-mediated DA efflux, with inhibitory contributions from GPR30 and ERbeta. E(2) also caused trafficking of ERalpha to the plasma membrane, trafficking of ERbeta away from the plasma membrane, and unchanged membrane GPR30 levels. Therefore, ERalpha is largely responsible for non-genomic estrogenic effects on DAT activity.

Publication types

  • Comparative Study
  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Cell Membrane / metabolism*
  • Cell Membrane / physiology
  • Dopamine Plasma Membrane Transport Proteins / metabolism*
  • Dopamine Plasma Membrane Transport Proteins / physiology
  • Estradiol / physiology
  • Estrogen Receptor alpha / physiology*
  • Estrogen Receptor beta / physiology*
  • Membrane Proteins / classification
  • Membrane Proteins / physiology*
  • PC12 Cells
  • Protein Transport / physiology
  • Rats
  • Receptors, Estrogen
  • Receptors, G-Protein-Coupled / physiology*


  • Dopamine Plasma Membrane Transport Proteins
  • Estrogen Receptor alpha
  • Estrogen Receptor beta
  • GPER1 protein, human
  • Membrane Proteins
  • Receptors, Estrogen
  • Receptors, G-Protein-Coupled
  • Estradiol