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AJP - Endocrinology and Metabolism, Vol 271, Issue 1 E50-E57, Copyright © 1996 by American Physiological Society
ARTICLES |
A. Handberg, L. A. Megeney, K. J. McCullagh, L. Kayser, X. X. Han and A. Bonen
Department of Medical Physiology and Anatomy, Panum Institute, Copenhagen, Denmark.
We investigated in 3-day-denervated muscles 1) the expression of GLUT-1 in perineurial sheaths (PNS) and muscle, 2) the muscle fiber-specific changes in GLUT-1 and GLUT-4, and 3) changes in basal and insulin-stimulated 3-O-methylglucose transport. GLUT-1 was increased in both the PNS (P < 0.05) and in the muscle membranes (P < 0.05). GLUT-1 and GLUT-4 concentrations were changed reciprocally, in a fiber-dependent fashion [GLUT-1: red gastrocnemius (RG), +31%; white gastrocnemius (WG), +10%; GLUT-4: RG, -53%; WG, -16%]. Basal glucose transport was increased (P < 0.05), and this increase was correlated with the oxidative nature of the muscles (r = 0.97). Insulin-stimulated glucose transport was decreased in denervated muscles (P < 0.05). This was also related to the oxidative nature of the muscles (r = -0.88). The increase in basal glucose transport was correlated with the loss of insulin-stimulated transport (r = 0.95). Thus the increase in GLUT-1 compensates for the loss of GLUT-4, resulting in a 56% regain of the reduced insulin-stimulated glucose transport.
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