Effect of alcohols on G-protein coupling of serotonin(1A) receptors from bovine hippocampus

K. G. Harikumar, Amitabha Chattopadhyay

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

The serotonin(1A) (5-hydroxytryptamine [5-HT](1A)) receptors are members of a superfamily of seven transmembrane domain receptors that couple to G- proteins. Serotonergic signalling has been shown to play an important role in alcohol intake, preference and dependence. G-protein coupling of the 5-HT(1A) receptor serves as an important determinant for serotonergic signalling. We have studied the effect of alcohols on G-protein coupling of bovine hippocampal 5-HT(1A) receptors in native membranes. This was done by monitoring the modulation of ligand (agonist and antagonist) binding in presence of alcohols by guanosine-5'-O-(3-thiotriphosphate) (GTP-γ-S), a non-hydrolyzable analogue of GTP. Our results show that alcohols inhibit the specific binding of the agonist 8-hydroxy-2-(di-N-propylamino)tetralin (except in case of ethanol) and the antagonist 4-(2'-methoxy)-phenyl-1-[2'- (N-2''-pyridinyl)-p-fluorobenzamido]ethyl-piperazine to 5-HT(1A) receptors in a concentration-dependent manner. Further, we show here that the action of alcohols on the bovine hippocampal 5-HT(1A) receptors could be modulated by guanine nucleotides and that the mode of action of ethanol on the 5-HT(1A) receptor may be quite different than that of other alcohols. The effect of GTP-γ-S on the agonist and the antagonist binding is found to be markedly different. Our results could be significant in the overall context of the role of G-protein coupling in serotonergic neurotransmission and its role in alcohol tolerance and dependence. (C) 2000 Elsevier Science Inc.

Original languageEnglish (US)
Pages (from-to)597-601
Number of pages5
JournalBrain Research Bulletin
Volume52
Issue number6
DOIs
StatePublished - Aug 1 2000

Keywords

  • 5-HT(1A) receptor
  • Alcohols
  • Bovine hippocampus
  • GTP-γ-S
  • OH-DPAT
  • p-MPPF

ASJC Scopus subject areas

  • Neuroscience(all)

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