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Am J Physiol Renal Physiol 274: F700-F708, 1998;
0363-6127/98 $5.00
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Vol. 274, Issue 4, F700-F708, April 1998

Anomalous decrease in dextran sulfate clearance in the diabetic rat kidney

Melissa J. Burne1, Yalçin Adal1, Neale Cohen2, Sianna Panagiotopoulos2, George Jerums2, and Wayne D. Comper1

1 Department of Biochemistry and Molecular Biology, Monash University, Clayton 3168; and 2 Endocrine Unit, Austin and Repatriation Medical Centre, Department of Medicine, University of Melbourne, Heidelberg, Victoria, Australia 3084

The anomalous increase in charge selectivity as previously observed with reduced dextran sulfate clearances in diabetic rats (L. D. Michels, M. Davidman, and W. F. Keane. Kidney Int. 21: 699-705, 1982) was confirmed in 4-wk streptozotocin (STZ) diabetic Sprague-Dawley rats using the isolated perfused kidney technique. The apparent charge selectivity in both control and diabetic rats could be abolished by increasing the dextran sulfate concentration to 200 µg/ml in the perfusate. This was demonstrated by a high rate of processing of dextran sulfate (~1,700 ng · min-1 · kidney-1) by glomeruli in both control and diabetic kidneys and by the fact that charge interaction could not explain the concentration dependence. The amount of urinary desulfation of dextran sulfate was also found to be significantly less in the diabetic kidney as was glomerular sulfatase activity compared with controls. Dextran sulfate glomerular processing is therefore altered in the STZ diabetic rat kidney but could be rationalized in terms of previous models of endothelial cell receptor-mediated uptake of dextran sulfate. The results are consistent with recent work demonstrating that there is little or no electrostatic charge interaction operating on dextran sulfate or other negatively charged molecules at the glomerular capillary wall.

dextran sulfate; isolated perfused kidney; glomerular cell uptake; fractional clearance; sulfatase; streptozotocin diabetes; charge selectivity


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