Enzymuria in streptozotocin-diabetic rats

Area of Science:

• Biochemistry
• Nephrology
• Diabetology

Background:

• Diabetes mellitus is associated with kidney damage.
• Understanding urinary and renal enzyme changes in diabetes is crucial for early detection and management.

Purpose of the Study:

• To investigate the impact of streptozotocin-induced diabetes on urinary excretion of kidney-specific enzymes, electrolytes, and other parameters in rats.
• To assess the effect of food withdrawal on these parameters in diabetic and control rats.
• To analyze renal cortical enzyme activities at the end of the study.

Main Methods:

• Twenty-four-hour urine samples were collected from control and streptozotocin-diabetic Wistar rats.
• Analyses included kidney-specific enzymes, electrolytes, creatinine, glucose, total protein, and urine volume.
• Experiments were conducted during two periods, with and without food withdrawal.

Main Results:

• Diabetic rats exhibited increased excretion of 15 urinary parameters, with decreased alanine aminopeptidase and gamma-glutamyltransferase activities.
• Food withdrawal led to decreased excretion of alanine aminopeptidase, gamma-glutamyltransferase, and total protein in diabetic rats compared to fasted controls.
• Renal cortex analysis revealed decreased alanine aminopeptidase activity in diabetic rats, while other enzymes showed varied changes.

Conclusions:

• Streptozotocin-induced diabetes significantly alters urinary excretion profiles of kidney-specific enzymes and electrolytes.
• Fasting further modifies these excretion patterns, highlighting the complex interplay between diabetes, nutrition, and kidney function.
• Changes in renal cortical enzyme activities suggest diabetes-induced alterations in kidney tissue metabolism.