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Effect of octreotide, captopril or insulin on renal changes and UAE in long-term experimental diabetes.

Renal and glomerular growth is inherent in early human and experimental diabetes frequently followed by later increase in urinary albumin excretion (UAE). Treatment with angiotensin converting enzyme (ACE) inhibitors has proven effective in delaying progression of human and experimental diabetic renal changes, and so has somatostatin analog treatment in experimental diabetes. The aim of the present study was to investigate three weeks of octreotide and captopril treatment alone or in combination following three months of untreated experimental diabetes, and compare the effects to those of insulin treatment. Diabetes induced significant increases in renal and glomerular growth and urinary albumin excretion. Octreotide and captopril alone and in combination reduced renal but not glomerular size, and the combined administration reduced UAE. None of these schedules affected blood glucose levels. Insulin treatment inducing euglycemia significantly reduced renal and glomerular size and UAE. In conclusion, insulin treatment with normalization of the diabetic metabolic derangement nearly normalizes renal and glomerular growth and UAE after three months of untreated diabetes. The combined treatment of octreotide and captopril was also followed by a significant decrease in renal growth and reduction in UAE compared to placebo treatment without affecting the metabolic control of the diabetic animals.