Prevention of diabetic glomerulopathy in streptozotocin diabetic rats by insulin treatment

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Abstract
Summary A single antibody radioimmunoassay has been used to measure albumin excretion in 3 groups of female Wistar rats. Two groups had Streptozotocin diabetes and were treated daily with insulin for 6 months. In one of the diabetic groups good glycaemic control was attempted and throughout the 6 months plasma glucose levels were fairly close to normal (92 ± 33 mg/100 ml at 2300 h and 186 ± 9 mg/100 ml at 0800 h). In the other diabetic group poor control was intended and the group had consistent high plasma glucose levels (576 ± 89 mg/100 ml and 460 ± 43 mg/100 ml). The third group was a non-diabetic control group. — Albumin excretion was measured on two occasions: before the induction of diabetes and after 6 months of diabetes. The geometric mean albumin excretion increased from 0.38 to 2.56 mg/24 h in the 18 non-diabetic controls. In the 20 diabetic rats in “good” control the geometric mean albumin excretion increased from 0.37 to 1.58 mg/ 24 h (NS compared with controls) and in the group of 22 rats in poor control albumin excretion increased from 0.35 to 6.54 mg/24 h. — The increase in albumin excretion in rats in poor control differed significantly both from that of the non-diabetic controls (2p = 0.023) and from that of the “well-controlled” diabetic rats (2p = 0.00011).