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Am J Physiol Endocrinol Metab 263: E1015-E1020, 1992;
0193-1849/92 $5.00
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Muscle glucose transport, GLUT-4 content, and degree of exercise training in obese Zucker rats

E. A. Banks 1, J. T. Brozinick Jr. 1, B. B. Yaspelkis III 1, H. Y. Kang 1, and J. L. Ivy 1

1 Exercise Physiology and Metabolism Laboratory, Department of Kinesiology, The University of Texas at Austin, Austin, Texas 78712

The effects of high (HI)- and low (LI)-intensity exercise training were examined on insulin-stimulated 3-O-methyl-d-glucose (3-MG) transport and concentration of insulin-regulatable glucose transporter protein (GLUT-4) in the red (fast-twitch oxidative) and white (fast-twitch glycolytic) quadriceps of the obese Zucker rat. Sedentary obese (SED) and lean (LN) Zucker rats were used as controls. 3-MG transport was determined during hindlimb perfusion in the presence of 8 mM 3-MG, 2 mM mannitol, 0.3 mM pyruvate, and 0.5 mU/ml insulin. HI and LI rats displayed greater rates of red quadriceps 3-MG transport and GLUT-4 concentrations than SED rats. No significant differences in rates of 3-MG transport or GLUT-4 concentrations were observed in the red quadriceps of HI and LI rats. There were no differences found in the rates of 3-MG transport in the white quadriceps of HI, LI, and SED rats although the difference between the HI and SED rats approached significance (P < 0.07). The GLUT-4 concentration and citrate synthase activity of HI rats were significantly greater than SED rats. The 3-MG transport rates of LN rats were twofold greater than SED rats regardless of fiber type, but a difference in GLUT-4 content between the LN and SED rats was observed only in the white quadriceps. GLUT-4 content of the obese rats was significantly correlated with citrate synthase activity (r = 0.93) and 3-MG transport (r = 0.82). The results suggest that the improvement in muscle insulin resistance of the obese Zucker rat after exercise training is due in part to an increased GLUT-4 concentration, which is related with the degree to which the muscle is trained.

glucose transporter; insulin; insulin resistance; diabetes, muscle fiber type

Submitted on May 21, 1992
Accepted on July 31, 1992




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