Glucose uptake via GLUT3 by human platelets is regulated by protein kinase B

doi:10.1074/jbc.M507221200

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Papers In Press, published online ahead of print July 26, 2005
J. Biol. Chem, 10.1074/jbc.M507221200
Submitted on July 5, 2005
Accepted on July 26, 2005

Glucose uptake via GLUT3 by human platelets is regulated by protein kinase B

Irlando Andrade Ferreira, Astrid I. M. Mocking, Rolf T. Urbanus, Samantha Varlack, Monika Wnuk, and Jan-Willem N. Akkerman

Department of Hematology, University Medical Center Utrecht, Utrecht 3584 CX

Corresponding Author: j.w.n.akkerman{at}lab.azu.nl

In insulin-responsive tissues, insulin is a potent activator of protein kinase B (PKB)-mediated glucose uptake through the facilitative glucose transporter GLUT4. In platelets, glucose uptake is mediated through GLUT3, which is present in plasma- (15%) and intracellular a-granule (85%) membranes. Here we report the PKB-mediated glucose uptake by platelets by agents that do (thrombin) or do not (insulin) induce a-granule translocation to the plasma membrane. Both thrombin and insulin activate PKB and induce glucose uptake albeit with different kinetics. Inhibition of PKB by the pharmacological inhibitor ML-9 decreases thrombin-induced a-granule release and thrombin- and insulin-induced glucose uptake. At low glucose (0.1 mM) both agents stimulate glucose uptake by lowering the Km for glucose (thrombin and insulin) and increasing Vmax (thrombin). At high glucose (5 mM), stimulation of glucose uptake by insulin disappears, and insulin becomes an inhibitor of thrombin-induced glucose uptake via mechanisms independent of PKB. We conclude that in platelets glucose transport through GLUT3 is regulated by changes in surface expression and affinity modulation, which are both under control of PKB.

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