Dopamine and gamma-aminobutyric acid transporters: differential regulation by agents that promote phosphorylation

Neurosci Lett. 1994 May 23;173(1-2):143-6. doi: 10.1016/0304-3940(94)90169-4.

Abstract

Treatment of striatal synaptosomes with the protein phosphatase inhibitor okadaic acid significantly decreased gamma-aminobutyric acid (GABA) uptake, indicating that the GABA transporter may be regulated by phosphorylation. Forskolin and 8-bromoadenosine-3,5-cyclic monophosphate (8-br-cAMP) inhibited GABA uptake to the same extent as okadaic acid, suggesting the involvement of protein kinase A in GABA transporter regulation. In contrast, the same treatments did not alter dopamine (DA) uptake into striatal synaptosomal preparations. The results suggest that the structurally related GABA and DA transporters may be subject to different post-translational regulation.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • 8-Bromo Cyclic Adenosine Monophosphate / pharmacology
  • Animals
  • Carrier Proteins / metabolism*
  • Colforsin / pharmacology
  • Dopamine / metabolism*
  • Dopamine Plasma Membrane Transport Proteins
  • Ethers, Cyclic / pharmacology
  • GABA Plasma Membrane Transport Proteins
  • In Vitro Techniques
  • Male
  • Membrane Glycoproteins*
  • Membrane Proteins / metabolism*
  • Membrane Transport Proteins*
  • Neostriatum / drug effects
  • Neostriatum / metabolism
  • Nerve Tissue Proteins*
  • Okadaic Acid
  • Organic Anion Transporters*
  • Phorbol Esters / pharmacology
  • Phosphoprotein Phosphatases / antagonists & inhibitors
  • Phosphorylation
  • Rats
  • Rats, Sprague-Dawley
  • Signal Transduction / drug effects
  • Synaptosomes / drug effects
  • Synaptosomes / metabolism
  • gamma-Aminobutyric Acid / metabolism*

Substances

  • Carrier Proteins
  • Dopamine Plasma Membrane Transport Proteins
  • Ethers, Cyclic
  • GABA Plasma Membrane Transport Proteins
  • Membrane Glycoproteins
  • Membrane Proteins
  • Membrane Transport Proteins
  • Nerve Tissue Proteins
  • Organic Anion Transporters
  • Phorbol Esters
  • Colforsin
  • Okadaic Acid
  • 8-Bromo Cyclic Adenosine Monophosphate
  • phorbol-12,13-didecanoate
  • gamma-Aminobutyric Acid
  • Phosphoprotein Phosphatases
  • Dopamine