To explore metabolic changes associated with the sorbitol accumulation and myo-inositol depletion observed in glomeruli of rats with experimental diabetes, we examined total and ouabain-inhibited adenosine triphosphatase (ATPase) activity in glomeruli isolated from control and streptozocin (STZ)-diabetic rats. Glomerular Na/K-ATPase activity (ouabain-inhibited) was significantly reduced in diabetic animals, while total (composite) ATPase activity remained unchanged. Treatment with insulin partially restored the Na/K-ATPase activity. Administration of the aldose reductase inhibitor, sorbinil, which normalizes glomerular contents of both sorbitol and myo-inositol in diabetes, completely prevented the diminution of Na/K-ATPase activity. These results establish that glomerular Na/K-ATPase activity is reduced in acute experimental diabetes. The ability of sorbinil to prevent this decrease suggests that it is related to polyol accumulation and/or myo-inositol depletion, although an effect of the drug unrelated to its aldose reductase inhibiting property has not been excluded. Since increased polyol pathway flux, decreased myo-inositol, and reduced Na/K-ATPase activity have also been described in peripheral nerve, another tissue in which typical diabetic complications characteristically occur,the consequences of these metabolic changes may be implicated in the pathogenesis of diabetic nephropathy.
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Original Contribution|
November 01 1985
Reduced Glomerular Sodium/Potassium Adenosine Triphosphatase Activity in Acute Streptozocin Diabetes and Its Prevention by Oral Sorbinil
Margo Panush Cohen;
Margo Panush Cohen
University of Medicine and Dentistry of New Jersey
Newark, New Jersey
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Amita Dasmahapatra;
Amita Dasmahapatra
University of Medicine and Dentistry of New Jersey
Newark, New Jersey
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Edith Shapiro
Edith Shapiro
University of Medicine and Dentistry of New Jersey
Newark, New Jersey
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Address reprint requests to Margo P. Cohen, M.D., Division of Endocrinology and Metabolism, Medical Science Bldg. I-588, University of Medicine and Dentistry of New Jersey, 100 Bergen Street, Newark, New Jersey 07103.
Diabetes 1985;34(11):1071–1074
Article history
Received:
December 18 1984
Revision Received:
April 17 1985
PubMed:
2995180
Citation
Margo Panush Cohen, Amita Dasmahapatra, Edith Shapiro; Reduced Glomerular Sodium/Potassium Adenosine Triphosphatase Activity in Acute Streptozocin Diabetes and Its Prevention by Oral Sorbinil. Diabetes 1 November 1985; 34 (11): 1071–1074. https://doi.org/10.2337/diab.34.11.1071
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