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J Appl Physiol 85: 2106-2111, 1998;
8750-7587/98 $5.00
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Vol. 85, Issue 6, 2106-2111, December 1998

Short-term exercise enhances insulin-stimulated GLUT-4 translocation and glucose transport in adipose cells

Cynthia M. Ferrara, Thomas H. Reynolds, Mary Jane Zarnowski, Joseph T. Brozinick Jr., and Samuel W. Cushman

Experimental Diabetes, Metabolism, and Nutrition Section, Diabetes Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892

This investigation examined the effects of short-term exercise training on insulin-stimulated GLUT-4 glucose transporter translocation and glucose transport activity in rat adipose cells. Male Wistar rats were randomly assigned to a sedentary (Sed) or swim training group (Sw, 4 days; final 3 days: 2 × 3 h/day). Adipose cell size decreased significantly but minimally (~20%), whereas total GLUT-4 increased by 30% in Sw vs. Sed rats. Basal 3-O-methyl-D-[14C]glucose transport was reduced by 62%, whereas maximally insulin-stimulated (MIS) glucose transport was increased by 36% in Sw vs. Sed rats. MIS cell surface GLUT-4 photolabeling was 44% higher in the Sw vs. Sed animals, similar to the increases observed in MIS glucose transport activity and total GLUT-4. These results suggest that increases in total GLUT-4 and GLUT-4 translocation to the cell surface contribute to the increase in MIS glucose transport with short-term exercise training. In addition, the results suggest that the exercise training-induced adaptations in glucose transport occur more rapidly than previously thought and with minimal changes in adipose cell size.

adipose cells; exercise; glucose metabolism


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