[Effect of exercise on glucose transporter gene expression in diabetic rat skeletal muscle].
OBJECTIVE
To investigate the effect of the exercise on glucose transporter 4 (GLUT4) gene expression in skeletal muscles of rats with streptozotocin-induced diabetes.


METHODS
Three experiment groups of rats were investigated: diabetic non-exercise group; diabetic exercise group; and normal controls. Diabetic exercise rats were swim-trained for 6 weeks. The GULT4 mRNA of skeletal muscle cells was determined with dot blot.


RESULTS
There was weak gene expression of GULT4 in diabetic rats, and dot blot revealed that the GLUT4 mRNA decrease 54.9% in skeletal muscle cells compared with the normal control. After 6 weeks exercise training, the hyperglycemia of diabetic exercise rats decreased significantly (from 18.5 +/- 1.9 mmol/L to 14.0 +/- 3.3 mmol/L, t = 4.64 P < 0.01). In muscle cells of diabetic exercise rats, the GLUT4 mRNA increased 56% as compared with the diabetic rats (t = 15.56, P < 0.01).


CONCLUSIONS
Chronic hyperglycemia may inhibit the gene expression of GLUT4 in diabetic rats, which caused the post-receptor insulin resistance in peripheral tissue. Exercise training can improve the impaired GLUT4 expression in diabetic rats, which may contribute to the mechanisms of enhanced insulin sensitivity and decreased hyperglycemia in diabetics mellitus.
Department of Sports Medicine, Huashan Hospital, Shanghai Medical University.
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Wu
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La
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Hu
D000818:Animals; D001692:Biological Transport; D001786:Blood Glucose / Q000378:metabolism*; D003921:Diabetes Mellitus, Experimental / Q000235:genetics*; D015870:Gene Expression; D051275:Glucose Transporter Type 4; D008297:Male; D009004:Monosaccharide Transport Proteins / Q000096:biosynthesis / Q000235:genetics*; D009124:Muscle Proteins; D018482:Muscle, Skeletal / Q000378:metabolism*; D010805:Physical Conditioning, Animal; D012333:RNA, Messenger / Q000096:biosynthesis; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley
D001786:Blood Glucose; D051275:Glucose Transporter Type 4; D009004:Monosaccharide Transport Proteins; D009124:Muscle Proteins; D012333:RNA, Messenger; C495694:Slc2a4 protein, rat