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Nuclear Receptor Rev-erb Is a Critical Lithium-Sensitive Component of the Circadian Clock
Lei Yin,1Jing Wang,1Peter S. Klein,2Mitchell A. Lazar1*
Lithium is commonly used to treat bipolar disorder, which isassociated with altered circadian rhythm. Lithium is a potentinhibitor of glycogen synthase kinase 3 (GSK3), which regulatescircadian rhythm in several organisms. In experiments with culturedcells, we show here that GSK3ß phosphorylates andstabilizes the orphan nuclear receptor Rev-erb, a negative componentof the circadian clock. Lithium treatment of cells leads torapid proteasomal degradation of Rev-erb and activation of clockgene Bmal1. A form of Rev-erb that is insensitive to lithiuminterferes with the expression of circadian genes. Control ofRev-erb protein stability is thus a critical component of theperipheral clock and a biological target of lithium therapy.
1 Division of Endocrinology, Diabetes, and Metabolism, and University of Pennsylvania School of Medicine, 415 Curie Boulevard, Philadelphia, PA 19104, USA. 2 Division of Hematology and Oncology, Department of Medicine, and the Institute for Diabetes, Obesity, and Metabolism, University of Pennsylvania School of Medicine, 415 Curie Boulevard, Philadelphia, PA 19104, USA.
* To whom correspondence should be addressed. E-mail: lazar{at}mail.med.upenn.edu
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