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Molecular and Cellular Biology, September 1998, p. 5457-5464, Vol. 18, No. 9
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Regulation of Insulin-Stimulated Glucose
Transporter GLUT4 Translocation and Akt Kinase Activity by
Ceramide
Scott A.
Summers,1
Luis A.
Garza,1
Honglin
Zhou,2 and
Morris J.
Birnbaum1,*
Howard Hughes Medical Institute and
Departments of Medicine1 and
Pharmacology,2 University of
Pennsylvania, Philadelphia, Pennsylvania 19104
Received 30 April 1998/Accepted 9 June 1998
The sphingomyelin derivative ceramide is a signaling molecule
implicated in numerous physiological events. Recently published reports
indicate that ceramide levels are elevated in insulin-responsive tissues of diabetic animals and that agents which trigger ceramide production inhibit insulin signaling. In the present series of studies,
the short-chain ceramide analog C2-ceramide
inhibited insulin-stimulated glucose transport by ~50% in 3T3-L1
adipocytes, with similar reductions in hormone-stimulated translocation
of the insulin-responsive glucose transporter (GLUT4) and
insulin-responsive aminopeptidase. C2-ceramide also
inhibited phosphorylation and activation of Akt, a molecule
proposed to mediate multiple insulin-stimulated metabolic events.
C2-ceramide, at concentrations which antagonized activation of both glucose uptake and Akt, had no effect on the tyrosine phosphorylation of insulin receptor substrate 1 (IRS-1) or the
amounts of p85 protein and phosphatidylinositol kinase activity that immunoprecipitated with anti-IRS-1 or antiphosphotyrosine antibodies. Moreover, C2-ceramide also
inhibited stimulation of Akt by platelet-derived growth factor, an
event that is IRS-1 independent. C2-ceramide did not
inhibit insulin-stimulated phosphorylation of mitogen-activated
protein kinase or pp70 S6-kinase, and it actually stimulated
phosphorylation of the latter in the absence of insulin.
Various pharmacological agents, including the immunosuppressant rapamycin, the protein synthesis inhibitor cycloheximide, and several
protein kinase C inhibitors, were without effect on ceramide's inhibition of Akt. These studies demonstrate ceramide's capacity to inhibit activation of Akt and imply that this is a mechanism of
antagonism of insulin-dependent physiological events, such as the
peripheral activation of glucose transport and the suppression of
apoptosis.
*
Corresponding author. Mailing address: Howard Hughes
Medical Institute and Department of Medicine, University of
Pennsylvania, Clinical Research Building, 415 Curie Blvd.,
Philadelphia, PA 19104. Phone: (215) 898-5001. Fax: (215) 573-9138. E-mail: birnbaum{at}hhmi.upenn.edu.
Molecular and Cellular Biology, September 1998, p. 5457-5464, Vol. 18, No. 9
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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