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J. Biol. Chem., Vol. 278, Issue 35, 33067-33077, August 29, 2003
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¶
From the
Department of Pharmacology and
Howard Hughes Medical Institute and Department
of Medicine, Division of Hematology-Oncology, University of Pennsylvania
School of Medicine, Philadelphia, Pennsylvania 19104-6148
Glycogen synthase kinase-3 (GSK-3) is a critical, negative regulator of
diverse signaling pathways. Lithium is a direct inhibitor of GSK-3 and has
been widely used to test the putative role of GSK-3 in multiple settings.
However, lithium also inhibits other targets, including inositol
monophosphatase and structurally related phosphomonoesterases, and thus
additional approaches are needed to attribute a given biological effect of
lithium to a specific target. For example, lithium is known to increase the
inhibitory N-terminal phosphorylation of GSK-3, but the target of lithium
responsible for this indirect regulation has not been identified. We have
characterized a short peptide derived from the GSK-3 interaction domain of
Axin that potently inhibits GSK-3 activity in vitro and in mammalian
cells and robustly activates Wnt-dependent transcription, mimicking lithium
action. We show here, using the GSK-3 interaction domain peptide, as well as
small molecule inhibitors of GSK-3, that lithium induces GSK-3 N-terminal
phosphorylation through direct inhibition of GSK-3 itself. Reduction of GSK-3
protein levels, either by RNA interference or by disruption of the mouse
GSK-3
gene, causes increased N-terminal phosphorylation of
GSK-3, confirming that GSK-3 regulates its own phosphorylation status.
Finally, evidence is presented that N-terminal phosphorylation of GSK-3 can be
regulated by the GSK-3-dependent protein phosphatase-1·inhibitor-2
complex.
Received for publication, December 11, 2002 , and in revised form, May 6, 2003.
* This work was supported by a grant from the National Institute of Mental Health (to P. S. K.). The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
¶ To whom correspondence should be addressed. Tel.: 215-898-2179; Fax: 215-573-4320; E-mail: pklein{at}mail.med.upenn.edu.
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