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 Neuroscijournal_title
Nature neuroscienceauthors
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 Cdoi
10.1038/nn2006subject
Has Abstractpub_date
2007-12-01 00:00:00pages
1559-68issue
12eissn
1097-6256issn
1546-1726pii
nn2006journal_volume
10pub_type
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