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Kinome Screen Identifies PFKFB3 and Glucose Metabolism as Important Regulators of the Insulin/Insulin-like Growth Factor (IGF)-1 Signaling Pathway


The insulin/insulin-like growth factor (IGF)-1 signaling pathway (ISP) plays a fundamental role in long term health in a range of organisms. Protein kinases including Akt and ERK are intimately involved in the ISP. To identify other kinases that may participate in this pathway or intersect with it in a regulatory manner, we performed a whole kinome (779 kinases) siRNA screen for positive or negative regulators of the ISP, using GLUT4 translocation to the cell surface as an output for pathway activity. We identified PFKFB3, a positive regulator of glycolysis that is highly expressed in cancer cells and adipocytes, as a positive ISP regulator. Pharmacological inhibition of PFKFB3 suppressed insulin-stimulated glucose uptake, GLUT4 translocation, and Akt signaling in 3T3-L1 adipocytes. In contrast, overexpression of PFKFB3 in HEK293 cells potentiated insulin-dependent phosphorylation of Akt and Akt substrates. Furthermore, pharmacological modulation of glycolysis in 3T3-L1 adipocytes affected Akt phosphorylation. These data add to an emerging body of evidence that metabolism plays a central role in regulating numerous biological processes including the ISP. Our findings have important implications for diseases such as type 2 diabetes and cancer that are characterized by marked disruption of both metabolism and growth factor signaling.

Type Journal
ISBN 1083-351X (Electronic) 0021-9258 (Linking)
Authors Trefely, S.; Khoo, P. S.; Krycer, J. R.; Chaudhuri, R.; Fazakerley, D. J.; Parker, B. L.; Sultani, G.; Lee, J.; Stephan, J. P.; Torres, E.; Jung, K.; Kuijl, C.; James, D. E.; Junutula, J. R.; Stockli, J.;
Garvan Authors
Publisher Name J BIOL CHEM
Published Date 2015-01-01 00:00:00
Published Volume 290
Published Issue 43
Published Pages 25834-46
Status Published In-print
OpenAccess Link Biol. Chem.-2015-Trefely-25834-46.pdf