RGS2 modulates coupling between GABAB receptors and GIRK channels in dopamine neurons of the ventral tegmental area.

Abstract:

:Agonists of GABA(B) receptors exert a bi-directional effect on the activity of dopamine (DA) neurons of the ventral tegmental area, which can be explained by the fact that coupling between GABA(B) receptors and G protein-gated inwardly rectifying potassium (GIRK) channels is significantly weaker in DA neurons than in GABA neurons. Thus, low concentrations of agonists preferentially inhibit GABA neurons and thereby disinhibit DA neurons. This disinhibition might confer reinforcing properties on addictive GABA(B) receptor agonists such as gamma-hydroxybutyrate (GHB) and its derivatives. Here we show that, in DA neurons of mice, the low coupling efficiency reflects the selective expression of heteromeric GIRK2/3 channels and is dynamically modulated by a member of the regulator of G protein signaling (RGS) protein family. Moreover, repetitive exposure to GHB increases the GABA(B) receptor-GIRK channel coupling efficiency through downregulation of RGS2. Finally, oral self-administration of GHB at a concentration that is normally rewarding becomes aversive after chronic exposure. On the basis of these results, we propose a mechanism that might underlie tolerance to GHB.

journal_name

Nat Neurosci

journal_title

Nature neuroscience

authors

Labouèbe G,Lomazzi M,Cruz HG,Creton C,Luján R,Li M,Yanagawa Y,Obata K,Watanabe M,Wickman K,Boyer SB,Slesinger PA,Lüscher C

doi

10.1038/nn2006

subject

Has Abstract

pub_date

2007-12-01 00:00:00

pages

1559-68

issue

12

eissn

1097-6256

issn

1546-1726

pii

nn2006

journal_volume

10

pub_type

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