A subpopulation of neuronal M4 muscarinic acetylcholine receptors plays a critical role in modulating dopamine-dependent behaviors

Jongrye Jeon, Ditte Dencker, Gitta Wörtwein, David P D Woldbye, Yinghong Cui, Albert A Davis, Allan I Levey, Günther Schütz, Thomas N Sager, Arne Mørk, Cuiling Li, Chu-Xia Deng, Anders Fink-Jensen, Jürgen Wess, Jongrye Jeon, Ditte Dencker Nielsen, Gitta Wörtwein, David P D Woldbye, Yinghong Cui, Albert A DavisAllan I Levey, Günther Schütz, Thomas N Sager, Arne Mørk, Cuiling Li, Chu-Xia Deng, Anders Fink-Jensen, Jürgen Wess

104 Citations (Scopus)

Abstract

Acetylcholine (ACh) regulates many key functions of the CNS by activating cell surface receptors referred to as muscarinic ACh receptors (M 1-M5 mAChRs). Like other mAChR subtypes, the M4 mAChRis widely expressed in different regions of the forebrain. Interestingly,M4 mAChRs are coexpressed with D1 dopamine receptors in a specific subset of striatal projection neurons. To investigate the physiological relevance of this M4 mAChR subpopulation in modulating dopamine-dependent behaviors, we used Cre/loxP technology to generate mutant mice that lack M4 mAChRs only in D1 dopamine receptor-expressing cells. The newly generated mutant mice displayed several striking behavioral phenotypes, including enhanced hyperlocomotor activity and increased behavioral sensitization following treatment with psychostimulants. These behavioral changes were accompanied by a lack of muscarinic inhibition of D1 dopamine receptor-mediated cAMP stimulation in the striatum and an increase in dopamine efflux in the nucleus accumbens. These novel findings demonstrate that a distinct subpopulation of neuronal M4 mAChRs plays a critical role in modulating several important dopamine-dependent behaviors. Since enhanced central dopaminergic neurotransmission is a hallmark of several severe disorders of the CNS, including schizophrenia and drug addiction, our findings have substantial clinical relevance.

Original languageEnglish
JournalJournal of Neuroscience
Volume30
Issue number6
Pages (from-to)2396-405
Number of pages10
ISSN0270-6474
DOIs
Publication statusPublished - 10 Feb 2010

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