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Am J Physiol Endocrinol Metab 265: E128-E134, 1993;
0193-1849/93 $5.00
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AJP - Endocrinology and Metabolism, Vol 265, Issue 1 E128-E134, Copyright © 1993 by American Physiological Society

ARTICLES

Effect of physical training on glucose transporter protein and mRNA levels in rat adipocytes

B. Stallknecht, P. H. Andersen, J. Vinten, L. L. Bendtsen, J. Sibbersen, O. Pedersen and H. Galbo
Department of Medical Physiology, Panum Institute, University of Copenhagen, Denmark.

Physical training increases insulin-stimulated glucose transport and the number of glucose transporters in adipocytes measured by cytochalasin B binding. In the present study we used immunoblotting to measure the abundance of two glucose transporters (GLUT-4, GLUT-1) in white adipocytes from trained rats. Furthermore, the abundance of the mRNAs for these proteins and glucose transport was measured. Rats were swim-trained for 10 wk, and adipocytes were isolated from epididymal fat pads. The amount of GLUT-4/adipocyte volume unit was significantly higher in trained animals compared with both age- and cell size-matched animals. The amount of GLUT-4 mRNA was also increased by training and it decreased with increasing age. Furthermore, young age as well as training was accompanied by relatively low GLUT-4 protein/mRNA and relatively high overall GLUT-4 efficiency (recruitability and/or intrinsic activity). GLUT-1 protein and mRNA levels/adipocyte volume did not change with age or training.


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