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Disassociation between glomerular hyperfiltration and extracellular volume in diabetic rats
B J Tucker1, R C Collins, M G Ziegler
1Department of Medicine, University of California, San Diego School of Medicine, La Jolla.
Kidney International
|June 1, 1991
Summary
Diabetic rats showed increased glomerular filtration rate (GFR) and renal plasma flow (RPF) within 24 hours of developing diabetes. Insulin treatment normalized blood glucose and prevented these changes, suggesting a link between diabetes and kidney function.
Area of Science:
- Nephrology
- Endocrinology
- Physiology
Background:
- Diabetes mellitus is associated with altered kidney function, including glomerular hyperfiltration.
- The role of extracellular fluid volume in the development of diabetic kidney disease remains unclear.
Purpose of the Study:
- To investigate the relationship between glomerular hyperfiltration and extracellular fluid volume in experimental diabetes.
- To examine the effects of insulin treatment on renal hemodynamics in diabetic rats.
Main Methods:
- Male Wistar rats were induced with streptozotocin to model type 1 diabetes.
- Renal function (GFR, RPF), extracellular fluid volume, and urinary sodium excretion were measured.
- Diabetic rats were either untreated or treated with insulin to normalize blood glucose.
Main Results:
- Untreated diabetic rats exhibited a significant increase in GFR and RPF within 24 hours, persisting for 15 days.
- Insulin treatment normalized blood glucose levels and prevented the development of hyperfiltration and increased RPF.
- No significant changes in GFR or RPF were observed in control rats or insulin-treated diabetic rats.
Conclusions:
- Diabetic hyperfiltration and associated changes in renal hemodynamics develop rapidly after diabetes onset.
- Insulin therapy effectively prevents the development of diabetic kidney hyperfiltration.
- These findings highlight the critical role of glycemic control in mitigating early diabetic kidney injury.