Nephroprotective effect of Withania somnifera: a dose-dependent study

Area of Science:

• Pharmacology
• Toxicology
• Ethnomedicine

Background:

• Gentamicin (GEN) is an antibiotic known to cause nephrotoxicity.
• Withania somnifera (Ashwagandha) is an ancient Ayurvedic herb with documented medicinal properties.
• Investigating natural compounds for drug-induced toxicity mitigation is crucial.

Purpose of the Study:

• To evaluate the nephroprotective potential of Withania somnifera root extract against gentamicin-induced kidney damage in a rat model.
• To determine the optimal dosage of Withania somnifera for mitigating gentamicin nephrotoxicity.

Main Methods:

• Rats were administered three doses of Withania somnifera root extract (250, 500, 750 mg/kg) orally for 14 days prior to and concurrently with gentamicin (100 mg/kg) treatment for 8 days.
• Kidney function was assessed by measuring kidney weight, serum urea, creatinine, urinary protein, glucose, body weight, and serum potassium levels.
• Histopathological examination of kidney tissues was performed to confirm tubular necrosis.

Main Results:

• Gentamicin treatment significantly increased kidney weight, urea, creatinine, and urinary protein/glucose, while decreasing body weight and potassium levels.
• The 500 mg/kg dose of Withania somnifera significantly reversed these gentamicin-induced changes.
• Histopathology confirmed tubular necrosis in gentamicin-treated rats, which was ameliorated by the 500 mg/kg Withania somnifera dose.

Conclusions:

• Withania somnifera exhibits significant nephroprotective effects against gentamicin-induced nephrotoxicity in rats.
• The optimal protective effect was observed with the 500 mg/kg dose, suggesting a dose-dependent response.
• The nephroprotective mechanism may involve enhanced antioxidant activity and free radical scavenging by Withania somnifera.