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AJP - Endocrinology and Metabolism, Vol 264, Issue 4 E583-E593, Copyright © 1993 by American Physiological Society
ARTICLES |
L. A. Megeney, P. D. Neufer, G. L. Dohm, M. H. Tan, C. A. Blewett, G. C. Elder and A. Bonen
Department of Kinesiology, University of Waterloo, Ontario, Canada.
We examined glucose uptake and GLUT-4 in rat muscles [soleus (Sol), plantaris (PL), extensor digitorum longus (EDL), tibialis anterior, and the red and white gastrocnemius (WG)]. In the normally innervated perfused rat hindlimb muscles the proportion of oxidative fibers was highly correlated with the muscle's insulin-stimulated 3-O-methyl-D-glucose (3-MG) uptake (R2 = 0.78) and GLUT-4 content (r = 0.94). Insulin-stimulated 3-MG uptake and GLUT-4 were also highly correlated (R2 = 0.996). In 3-day denervated muscles, insulin-stimulated 3-MG uptake was reduced in all six muscles (-41 to -14.6%, P < 0.05), and GLUT-4 content was also reduced (-87.5 to -34.9%), except in the WG and EDL (P > 0.05). A very high correlation was observed between the decrements in GLUT-4 (%) and the decrements in 3-MG uptake (%; r = 0.99). The relatively greater loss in muscle activity (%) due to denervation in the Sol compared with the PL coincided with the reductions (%) in GLUT-4 and 3-MG uptake. These studies demonstrate that glucose uptake and GLUT-4 are regulated by insulin-independent means, namely the oxidative capacity of the muscle and the normal activity level of the muscle.
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