Gentamicin nephrotoxicity in rat: some biochemical correlates.

Area of Science:

• Nephrology
• Pharmacology
• Biochemistry

Background:

• Aminoglycoside antibiotics like gentamicin are crucial for treating bacterial infections.
• Gentamicin is known to cause nephrotoxicity, but the underlying biochemical mechanisms require further investigation.
• Understanding gentamicin's impact on renal and plasma biomarkers is essential for managing its side effects.

Purpose of the Study:

• To investigate the effects of gentamicin on kidney reduced glutathione (GSH) and diamine oxidase (DAO) activity.
• To assess the impact of gentamicin on plasma creatinine, magnesium (Mg), and DAO activity.
• To determine the dose-dependent and time-course effects of gentamicin on these parameters.

Main Methods:

• Rats were administered varying doses of gentamicin (20, 40, 80 mg/kg/day) intramuscularly for 6 days.
• Biochemical parameters including GSH, DAO activity, creatinine, and Mg were measured in kidney and plasma.
• Histopathological examination of renal tissue was performed to assess drug-induced damage.

Main Results:

• Gentamicin induced a dose-dependent decrease in renal GSH concentrations, with levels remaining low even 14 days post-treatment.
• Plasma Mg levels decreased significantly, while plasma creatinine levels increased significantly, with these changes persisting for 14 days after gentamicin withdrawal.
• Dose-dependent proximal renal tubular necrosis was observed histopathologically; plasma and renal DAO activity remained largely unaffected.

Conclusions:

• Gentamicin administration leads to significant nephrotoxicity, evidenced by reduced renal GSH and altered plasma creatinine and Mg levels.
• The observed biochemical changes and renal damage indicate a persistent effect of gentamicin, even after cessation of treatment.
• Further research into the mechanisms of gentamicin-induced nephrotoxicity is warranted to develop protective strategies.