Elimination of GRK2 from cholinergic neurons reduces behavioral sensitivity to muscarinic receptor activation.

Published

Journal Article

Although G-protein-coupled receptor kinase 2 (GRK2) is the most widely studied member of a family of kinases that has been shown to exert powerful influences on a variety of G-protein-coupled receptors, its role in the brain remains largely unknown. Here we report the localization of GRK2 in the mouse brain and generate novel conditional knock-out (KO) mice to assess the physiological importance of this kinase in cholinergic neurons. Mice with the selective deletion of GRK2 in this cell population (ChAT(IRES-cre)Grk2(f/f) KO mice) exhibit reduced behavioral responsiveness to challenge with oxotremorine-M (Oxo-M), a nonselective muscarinic acetylcholine receptor agonist. Specifically, Oxo-M-induced hypothermia, hypolocomotion, and salivation were markedly reduced in these animals, while analgesic responses were unaltered. In contrast, we found that GRK2 deficiency in cholinergic neurons does not alter cocaine-induced psychomotor activation, behavioral sensitization, or conditioned place preference. These results demonstrate that the elimination of GRK2 in cholinergic neurons reduces sensitivity to select muscarinic-mediated behaviors, while dopaminergic effects remain intact and further suggests that GRK2 may selectively impair muscarinic acetylcholine receptor-mediated function in vivo.

Full Text

Duke Authors

Cited Authors

  • Daigle, TL; Caron, MG

Published Date

  • August 15, 2012

Published In

Volume / Issue

  • 32 / 33

Start / End Page

  • 11461 - 11466

PubMed ID

  • 22895728

Pubmed Central ID

  • 22895728

Electronic International Standard Serial Number (EISSN)

  • 1529-2401

Digital Object Identifier (DOI)

  • 10.1523/JNEUROSCI.2234-12.2012

Language

  • eng

Conference Location

  • United States