Glycogen synthase kinase 3α and 3β mediate a glucose-sensitive antiapoptotic signaling pathway to stabilize Mcl-1

Yuxing Zhao, Brian J. Altman, Jonathan L. Coloff, Catherine E. Herman, Sarah R. Jacobs, Heather L. Wieman, Jessica A. Wofford, Leah N. Dimascio, Olga Ilkayeva, Ameeta Kelekar, Tannishtha Reya, Jeffrey C. Rathmell

Research output: Contribution to journalArticlepeer-review

150 Scopus citations

Abstract

Glucose uptake and utilization are growth factor-stimulated processes that are frequently upregulated in cancer cells and that correlate with enhanced cell survival. The mechanism of metabolic protection from apoptosis, however, has been unclear. Here we identify a novel signaling pathway initiated by glucose catabolism that inhibited apoptotic death of growth factor-deprived cells. We show that increased glucose metabolism protected cells against the proapoptotic Bcl-2 family protein Bim and attenuated degradation of the antiapoptotic Bcl-2 family protein Mcl-1. Maintenance of Mcl-1 was critical for this protection, as glucose metabolism failed to protect Mcl-1-deficient cells from apoptosis. Increased glucose metabolism stabilized Mcl-1 in both cell lines and primary lymphocytes via inhibitory phosphorylation of glycogen synthase kinase 3α and 3β (GSK-3α/β), which otherwise promoted Mcl-1 degradation. While a number of kinases can phosphorylate and inhibit GSK-3α/β, we provide evidence that protein kinase C may be stimulated by glucose-induced alterations in diacylglycerol levels or distribution to phosphorylate GSK-3α/β, maintain Mcl-1 levels, and inhibit cell death. These data provide a novel nutrient-sensitive mechanism linking glucose metabolism and Bcl-2 family proteins via GSK-3 that may promote survival of cells with high rates of glucose utilization, such as growth factor-stimulated or cancerous cells.

Original languageEnglish (US)
Pages (from-to)4328-4339
Number of pages12
JournalMolecular and cellular biology
Volume27
Issue number12
DOIs
StatePublished - Jun 2007

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