Members of the PKC (protein kinase C) superfamily play key regulatory roles in glucose transport. How the different PKC isotypes are involved in the regulation of glucose transport is still poorly defined. PMA is a potent activator of conventional and novel PKCs and PMA increases the rate of glucose uptake in many different cell systems. In the present study, we show that PMA treatment increases glucose uptake in 3T3-L1 adipocytes by two mechanisms: a mitogen-activated protein kinase kinase-dependent increase in GLUT1 (glucose transporter 1) expression levels and a PKCλ-dependent translocation of GLUT1 towards the plasma membrane. Intriguingly, PKCλ co-immunoprecipitated with PKCβII and did not with PKCβI. Previously, we have described that down-regulation of PKCβII protein levels or inhibiting PKCβII by means of the myristoylated PKCβC2–4 peptide inhibitor induced GLUT1 translocation towards the plasma membrane in 3T3-L1 adipocytes. Combined with the present findings, these results suggest that the liberation of PKCλ from PKCβII is an important factor in the regulation of GLUT1 distribution in 3T3-L1 adipocytes.
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Research Article|
November 23 2004
Regulation of GLUT1-mediated glucose uptake by PKCλ–PKCβII interactions in 3T3-L1 adipocytes
Remko R. BOSCH;
*Department of Chemical Endocrinology, University Medical Centre Nijmegen, Nijmegen, The Netherlands
†Department of Endocrinology, University Medical Centre Nijmegen, Nijmegen, The Netherlands
‡Department of Veterinary Pharmacy, Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Utrecht, Utrecht, The Netherlands
2To whom correspondence should be addressed, at Department of Veterinary Pharmacy, Pharmacology and Toxicology, University of Utrecht, The Netherlands (email R.R.Bosch@vet.uu.nl).
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Merlijn BAZUINE;
Merlijn BAZUINE
1
§Department of Molecular Cell Biology, Leiden University Medical Center, Leiden, The Netherlands
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Paul N. SPAN;
Paul N. SPAN
*Department of Chemical Endocrinology, University Medical Centre Nijmegen, Nijmegen, The Netherlands
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Peter H. G. M. WILLEMS;
Peter H. G. M. WILLEMS
∥Department of Biochemistry, University Medical Centre Nijmegen, Nijmegen, The Netherlands
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André J. OLTHAAR;
André J. OLTHAAR
*Department of Chemical Endocrinology, University Medical Centre Nijmegen, Nijmegen, The Netherlands
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Helga van RENNES;
Helga van RENNES
*Department of Chemical Endocrinology, University Medical Centre Nijmegen, Nijmegen, The Netherlands
¶Department of Medical Oncology, University Medical Centre Nijmegen, Nijmegen, The Netherlands
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J. Antonie MAASSEN;
J. Antonie MAASSEN
§Department of Molecular Cell Biology, Leiden University Medical Center, Leiden, The Netherlands
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Cees J. TACK;
Cees J. TACK
†Department of Endocrinology, University Medical Centre Nijmegen, Nijmegen, The Netherlands
**Department of General Internal Medicine, University Medical Centre Nijmegen, Nijmegen, The Netherlands
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Ad R. M. M. HERMUS;
Ad R. M. M. HERMUS
†Department of Endocrinology, University Medical Centre Nijmegen, Nijmegen, The Netherlands
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C. G. J. (Fred) SWEEP
C. G. J. (Fred) SWEEP
*Department of Chemical Endocrinology, University Medical Centre Nijmegen, Nijmegen, The Netherlands
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Publisher: Portland Press Ltd
Received:
May 13 2004
Revision Received:
July 14 2004
Accepted:
August 13 2004
Accepted Manuscript online:
August 13 2004
Online ISSN: 1470-8728
Print ISSN: 0264-6021
The Biochemical Society, London
2004
Biochem J (2004) 384 (2): 349–355.
Article history
Received:
May 13 2004
Revision Received:
July 14 2004
Accepted:
August 13 2004
Accepted Manuscript online:
August 13 2004
Citation
Remko R. BOSCH, Merlijn BAZUINE, Paul N. SPAN, Peter H. G. M. WILLEMS, André J. OLTHAAR, Helga van RENNES, J. Antonie MAASSEN, Cees J. TACK, Ad R. M. M. HERMUS, C. G. J. (Fred) SWEEP; Regulation of GLUT1-mediated glucose uptake by PKCλ–PKCβII interactions in 3T3-L1 adipocytes. Biochem J 1 December 2004; 384 (2): 349–355. doi: https://doi.org/10.1042/BJ20040797
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