Gentamicin-induced nephrotoxicity in mice: protection by loop diuretics

Area of Science:

• Nephrology
• Pharmacology
• Toxicology

Background:

• Gentamicin is a widely used antibiotic with known nephrotoxic potential, primarily affecting proximal tubular cells.
• Assessing and mitigating gentamicin-induced kidney damage is crucial for patient safety and effective treatment.

Purpose of the Study:

• To investigate the effect of concomitant administration of specific diuretics on gentamicin-induced nephrotoxicity in a mouse model.
• To evaluate the urinary excretion of N-acetyl-beta-D-glucosaminidase (NAG) and electron microscopy findings as indicators of tubular damage.

Main Methods:

• Healthy male MF1 mice were administered gentamicin (50 or 100 mg/kg/day) via intraperitoneal injection for 7 or 10 days.
• Three diuretics (frusemide, bumetanide, piretanide) were co-administered at specific doses.
• Renal tubular damage was assessed by measuring urinary NAG excretion and through electron microscopy.

Main Results:

• Gentamicin administration led to significant proximal tubular cell damage, peaking at 7 days.
• Co-administration of frusemide, bumetanide, or piretanide with gentamicin resulted in reduced tubular damage compared to gentamicin alone.
• Urinary NAG levels and electron microscopy confirmed the protective effect of the diuretics.

Conclusions:

• The study demonstrates a protective effect of frusemide, bumetanide, and piretanide against gentamicin-induced nephrotoxicity in mice.
• This finding contrasts with previous research and suggests a potential therapeutic strategy for mitigating gentamicin-related kidney injury.