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Biochem Biophys Res Commun. 2006 Jul 14;345(4):1643-8. Epub 2006 May 24.

Recruitment of active glycogen synthase kinase-3 into neuronal lipid rafts.

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  • 1Interdepartmental Program in Neuroscience, University of Rochester School of Medicine and Dentistry, NY 14642, USA.

Abstract

Glycogen synthase kinase (GSK)-3beta has emerged as a key molecule that regulates neuronal apoptosis. To examine the molecular mechanism(s) through which GSK-3beta regulates this process, we studied the subcellular localization of GSK-3beta following exposure of the cells to well-characterized apoptotic stimuli. Here, we report that the induction of apoptosis by withdrawal of serum and potassium triggers dephosphorylation of GSK-3beta at serine 9 and subsequent translocation of these molecules into neuronal lipid raft microdomains. Inhibition of GSK-3beta by small molecule inhibitors blocks specific phosphorylation of lipid raft associated protein Tau. Consistent with the notion that the lipid raft domains may serve as a platform for the cellular signaling complexes, disruption of lipid rafts protected neurons from apoptosis induced by withdrawal of serum and potassium as well as by HIV-1 Tat. Our observations reveal novel interaction of GSK-3beta and raft domains, and suggest that such interaction could contribute to neuronal apoptosis.

PMID:
16735023
[PubMed - indexed for MEDLINE]
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