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Volume 272, Number 48, Issue of November 28, 1997 pp. 30075-30082
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

Protein Kinase C-zeta as a Downstream Effector of Phosphatidylinositol 3-Kinase during Insulin Stimulation in Rat Adipocytes
POTENTIAL ROLE IN GLUCOSE TRANSPORT

(Received for publication, July 24, 1997, and in revised form, September 8, 1997)

Mary L. Standaert , Lamar Galloway , Purushotham Karnam , Gautam Bandyopadhyay , Jorge Moscat Dagger and Robert V. Farese Dagger

From the J. A. Haley Veterans' Hospital Research Service and Departments of Internal Medicine and Biochemistry/Molecular Biology, University of South Florida College of Medicine, Tampa, Florida 33612 and Dagger  Centro de Biologia Molecular "Servero Ochoa," Universidad Autónoma, Canto Blanco, 28049 Madrid, Spain

Insulin provoked rapid increases in enzyme activity of immunoprecipitable protein kinase C-zeta (PKC-zeta ) in rat adipocytes. Concomitantly, insulin provoked increases in 32P labeling of PKC-zeta both in intact adipocytes and during in vitro assay of immunoprecipitated PKC-zeta ; the latter probably reflected autophosphorylation, as it was inhibited by the PKC-zeta pseudosubstrate. Insulin-induced activation of immunoprecipitable PKC-zeta was inhibited by LY294002 and wortmannin; this suggested dependence upon phosphatidylinositol (PI) 3-kinase. Accordingly, activation of PI 3-kinase by a pYXXM-containing peptide in vitro resulted in a wortmannin-inhibitable increase in immunoprecipitable PKC-zeta enzyme activity. Also, PI-3,4-(PO4)2, PI-3,4,5-(PO4)3, and PI-4,5-(PO4)2 directly stimulated enzyme activity and autophosphoralytion in control PKC-zeta immunoprecipitates to levels observed in insulin-treated PKC-zeta immunoprecipitates. In studies of glucose transport, inhibition of immunoprecipitated PKC-zeta enzyme activity in vitro by both the PKC-zeta pseudosubstrate and RO 31-8220 correlated well with inhibition of insulin-stimulated glucose transport in intact adipocytes. Also, in adipocytes transiently expressing hemagglutinin antigen-tagged GLUT4, co-transfection of wild-type or constitutive PKC-zeta stimulated hemagglutinin antigen-GLUT4 translocation, whereas dominant-negative PKC-zeta partially inhibited it. Our findings suggest that insulin activates PKC-zeta through PI 3-kinase, and PKC-zeta may act as a downstream effector of PI 3-kinase and contribute to the activation of GLUT4 translocation.


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