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In vivo effects of vanadium on GLUT4 translocation in cardiac tissue of STZ-diabetic rats

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Abstract

The effect of vanadium treatment on insulin-stimulated glucose transporter type 4 (GLUT4) translocation was studied in cardiac tissue of streptozotocin (STZ)-induced diabetic rats by determining the subcellular distribution of GLUT4. Four groups of rats were examined: control and diabetic, with or without bis(maltolato)oxovanadium(IV) (BMOV, an organic form of vanadium) treatment for 8 weeks. The effect of vanadium on insulin-induced GLUT4 translocation was studied at 5 min as the early insulin response and at 15 min after insulin injection as the maximal insulin response.

At 5 min after insulin injection, plasma membrane GLUT4 level in the diabetic-treated group was not different from the control groups and was significantly higher than that of the insulin-stimulated diabetic group, indicating an enhancement of insulin response on GLUT4 translocation brought about by vanadium treatment. In contrast to that at 5 min after insulin injection, no significant difference in the plasma membrane GLUT4 level was observed between the diabetic and the diabetic-treated groups at 15 min after insulin injection. GLUT4 mobilization from the intracellular pool in response to insulin was also investigated at 15 min after insulin injection. Basal intracellular GLUT4 content was significantly higher in the diabetic-treated group when compared to the diabetic group under the same condition. However, the increased basal intracellular GLUT4 in the diabetic-treated group did not result in more insulin-mediated GLUT4 translocation at 15 min after insulin injection. In conclusion, the finding that plasma membrane GLUT4 in the diabetic-treated group is significantly higher than that of the diabetic group at 5 min but not at 15 min post-insulin injection indicates that vanadium treatment enhances insulin-mediated GLUT4 translocation in cardiac tissue by enhancing its early response.

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  1. Division of Pharmacology and Toxicology, Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, BC, Canada, V6T 1Z3

    Shu Hong Li & John H. McNeill

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  1. Shu Hong Li
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  2. John H. McNeill
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Correspondence to John H. McNeill.

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Li, S.H., McNeill, J.H. In vivo effects of vanadium on GLUT4 translocation in cardiac tissue of STZ-diabetic rats. Mol Cell Biochem 217, 121–129 (2001). https://doi.org/10.1023/A:1007224828753

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