Abstract
Background/Aims The pathogenesis of post-transplant diabetes mellitus is thought to be partly related to the direct toxic effect of cyclosporine on pancreatic β-cells and the resultant decrease in insulin synthesis and secretion. As a result of hyperglycemia , glycosuria may be found in cyclosporine administration. However, mechanism of glycosuria in cyclosporine nephrotoxicity was not clear Methods Cyclosporine was subcutaneously injected to male Sprague-Dawley rats at a daily dose of 7.5 mg/kg (n=6) for 6 weeks. Biochemical data were obtained from urine and plasma samples. Results Cyclosporine treatment caused a remarkable increase in urine volume and a decrease in urine osmolality. Urinary excretion of glucose was remarkably elevated by cyclosporine administration (7±3.0 mg/dL versus 12896±3218 mg/dL; P Conclusion Glycosuria may occur without hyperglycemia in cyclosporine administration. We suggest that cyclosporine may decrease tubular reabsorption of glucose in renal tubular epithelial cells, and then glycosuria could be induced by the altered glucose transporter expressions. We will analyze the glucose transporters in proximal tubule of rat kidney.
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