The clock gene Per2 influences the glutamatergic system and modulates alcohol consumption.

Authors:
Rainer Spanagel, Gurudutt Pendyala, Carolina Abarca, Tarek Zghoul, Carles Sanchis-Segura, Maria Chiara Magnone, Jesús Lascorz, Martin Depner, David Holzberg, Michael Soyka, Stefan Schreiber, Fumihiko Matsuda, Mark Lathrop, Gunter Schumann, Urs Albrecht
Year of publication:
2005
Volume:
11
Issue:
1
Issn:
1078-8956
Journal title abbreviated:
NAT MED
Journal title long:
Nature medicine
Impact factor:
30.357
Abstract:
Period (Per) genes are involved in regulation of the circadian clock and are thought to modulate several brain functions. We demonstrate that Per2(Brdm1) mutant mice, which have a deletion in the PAS domain of the Per2 protein, show alterations in the glutamatergic system. Lowered expression of the glutamate transporter Eaat1 is observed in these animals, leading to reduced uptake of glutamate by astrocytes. As a consequence, glutamate levels increase in the extracellular space of Per2(Brdm1) mutant mouse brains. This is accompanied by increased alcohol intake in these animals. In humans, variations of the PER2 gene are associated with regulation of alcohol consumption. Acamprosate, a drug used to prevent craving and relapse in alcoholic patients is thought to act by dampening a hyper-glutamatergic state. This drug reduced augmented glutamate levels and normalized increased alcohol consumption in Per2(Brdm1) mutant mice. Collectively, these data establish glutamate as a link between dysfunction of the circadian clock gene Per2 and enhanced alcohol intake.