Anomalous decrease in dextran sulfate clearance in the diabetic rat kidney

被引:11
作者
Burne, MJ
Adal, Y
Cohen, N
Panagiotopoulos, S
Jerums, G
Comper, WD [1 ]
机构
[1] Monash Univ, Dept Biochem & Mol Biol, Melbourne, Vic 3168, Australia
[2] Univ Melbourne, Austin & Repatriat Med Ctr, Dept Med, Endocrine Unit, Melbourne, Vic 3084, Australia
关键词
dextran sulfate; isolated perfused kidney; glomerular cell uptake; fractional clearance; sulfatase; streptozotocin diabetes; charge selectivity;
D O I
10.1152/ajprenal.1998.274.4.F700
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
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 mu g/ml in the perfusate. This was demonstrated by a high rate of processing of dextran sulfate (similar to 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.
引用
收藏
页码:F700 / F708
页数:9
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