Journal
JOURNAL OF CLINICAL INVESTIGATION
Volume 121, Issue 9, Pages 3756-3762Publisher
AMER SOC CLINICAL INVESTIGATION INC
DOI: 10.1172/JCI45194
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Funding
- National Institute of Mental Health [1RO1MH58324]
- American Federation for Aging Research
- Leukemia and Lymphoma Society
- Training Program in Neuropsychopharmacology [T32 MH14654-33]
- Manton Center for Orphan Disease Research
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Lithium is the first-line therapy for bipolar disorder. However, its therapeutic target remains controversial. Candidates include inositol monophosphatases, glycogen synthase kinase-3 (GSK-3), and a beta-arrestin-2/AKT/protein phosphatase 2A (beta-arrestin-2/AKT/PP2A) complex that is known to be required for lithium-sensitive behaviors. Defining the direct target(s) is critical for the development of new therapies and for elucidating the molecular pathogenesis of this major psychiatric disorder. Here, we show what we believe to be a new link between GSK-3 and the beta-arrestin-2 complex in mice and propose an integrated mechanism that accounts for the effects of lithium on multiple behaviors. GSK-3 beta (Gsk3b) overexpression reversed behavioral defects observed in lithium-treated mice and similar behaviors observed in Gsk3b(+/-) mice. Furthermore, immunoprecipitation of striatial tissue from WT mice revealed that lithium disrupted the beta-arrestin-2/Akt/PP2A complex by directly inhibiting GSK-3. GSK-3 inhibitors or loss of one copy of the Gsk3b gene reduced beta-arrestin-2/Akt/PP2A complex formation in mice, while overexpression of Gsk3b restored complex formation in lithium-treated mice. Thus, GSK-3 regulates the stability of the beta-arrestin-2/Akt/PP2A complex, and lithium disrupts the complex through direct inhibition of GSK-3. We believe these findings reveal a new role for GSK-3 within the beta-arrestin complex and demonstrate that GSK-3 is a critical target of lithium in mammalian behaviors.
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