The Journal of Immunology, Vol 152, Issue 6 2660-2668, Copyright © 1994 by American Association of Immunologists

ARTICLES

Changes in glucose transport and transporter isoforms during the activation of human peripheral blood lymphocytes by phytohemagglutinin

R Chakrabarti, CY Jung, TP Lee, H Liu and BK Mookerjee
Biophysics Laboratory and Medical Service, Veterans Affairs Medical Center, Buffalo, NY 14215.

We have explored the mechanism of stimulation of glucose transport during PHA stimulation of human peripheral blood lymphocytes (HPBT) enriched in T cells. Equilibrium exchange flux of 3-O-methyl glucose (3- O-MG) was stimulated two- and fourfold at 24 and 48 h after PHA stimulation, respectively. The increase was transient in that the flux rate returned to control (unstimulated) levels by 96 h. Immunoblotting and immunoprecipitation using specific Abs revealed that resting HPBT expresses glucose transporter isoforms GLUT-2 and GLUT-3 but not GLUT- 1. After PHA stimulation, GLUT-1 expression was induced predominantly in the plasma membrane, whereas GLUT-3 expression was simultaneously down-regulated. GLUT-1 expression was detectable at 24 h, peaked at 48 h, and disappeared at 96 h. The total number of glucose transporters per cell measured as the total capacity of D-glucose displaceable cytochalasin B binding did not change significantly at any time after PHA stimulation. PHA stimulation also caused expression of high affinity IL-2R and secretion of IL-2. The IL-2 secretion was transient, which peaked at 24 h, slightly preceding the GLUT-1 expression peak and disappeared at 72 h. In PHA-activated HPBT cells synchronized at G0-G1, GLUT-1 was not expressed but was rapidly induced by exposure to IL-2. This induction did not occur in the presence of cyclosporin A, which inhibits IL-2 secretion. Based on these observations, we conclude that PHA stimulation increases glucose transport partly by inducing the expression of GLUT-1 instead of GLUT-3 and that GLUT-1 expression is induced by signals generated by IL-2 binding to its high affinity receptors.

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