Functional and morphological changes in the rat kidney after long-term adrenaline application.

Area of Science:

• Nephrology
• Pharmacology
• Toxicology

Background:

• Adrenaline (epinephrine) is a critical hormone and neurotransmitter.
• Its prolonged administration can lead to various physiological effects.
• Understanding the renal impact of sustained adrenaline exposure is crucial for clinical practice.

Purpose of the Study:

• To investigate the functional and morphological effects of sustained adrenaline administration on kidney tissue.
• To determine the dose-dependency and reversibility of these renal changes.
• To assess specific biochemical markers and clearance rates following adrenaline exposure.

Main Methods:

• Subcutaneous implantation of adrenaline-releasing retard-tablets in animal models (V 15 and V 30 groups).
• Administration of varying adrenaline doses (15 mg and 30 mg) over 24 hours.
• Monitoring of inulin, PAH, and urea clearance rates.
• Analysis of urine gamma-glutamyl transferase (GGT) activity, serum/urine urea and urea-N, serum glucose and triglycerides, and electrolyte levels.
• Histopathological examination of glomerular and tubular regions for morphological changes.

Main Results:

• Sustained adrenaline application induced dose-dependent morphological changes in renal glomeruli and tubules.
• Glomerular damage was largely irreversible, while tubular damage, including fatty deposits, showed signs of reversibility within 7 days.
• No significant differences were observed in inulin, PAH, or urea clearance rates between groups.
• Serum and urine biochemical markers, including electrolytes and glucose, remained within normal ranges.

Conclusions:

• Prolonged adrenaline administration can cause significant, dose-dependent kidney damage.
• Glomerular injury appears to be irreversible, whereas tubular damage may be reversible.
• The study highlights the critical need to consider the potential nephrotoxic effects of sustained adrenaline exposure.