Abstract
Gentamicin remains the mainstay in treatment of gram-negative infections, despite its potential ototoxicity and nephrotoxicity. In this study, we investigated dose-related protecting effects of vitamin C against gentamicin-induced rat nephrotoxicity. Hence, 50 male albino Wistar rats were randomly divided into five equal groups to receive a corresponding dose of either normal saline as control, vitamin C (200 mg/kg/bw, i.m.) or gentamicin alone (80 mg/kg/bw, i.m.) or in combination with vitamin C at low dose (200 mg/kg/bw, i.m.; LVG) and high dose (600 mg/kg/bw, i.m.) for 9 days. Daily administration of gentamicin at a dose of 80 mg/kg resulted in a significant increase in oxidative stress in renal tissues and plasma and a concomitant decrease in the creatinine clearance and renal blood flow as result of early hemodynamic toxicity. Histopathological examinations revealed acute tubular necrosis with hyaline cast formation triggered by gentamicin over 9 days of experiment, in addition to interstitial nephritis and tubular epithelial loss. Further biochemical studies showed protecting effects of supplemented vitamin C at a high dose, including slowdown in the urinary enzyme activity, a significant decrease in plasma lipid peroxidation, and an increased tissue superoxide dismutase activity with recovery in the glomerular hemodynamicity and the ATPase activity up to 50% when compared to controls and low-dose rats (LVG). In high-dose animals, normal glomerular and tubular function on recovery from toxic renal failure led us to conclude that antioxidant properties of vitamin C consistently increase with dose intensity. The present study also provided evidence that high dose of vitamin C prevented both functional and histological renal changes induced by gentamicin in rats, more efficient than low dose of the vitamin.
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Derakhshanfar, A., Roshanzamir, M. & Bidadkosh, A. Dose-related protecting effects of vitamin C in gentamicin-induced rat nephrotoxicity: a histopathologic and biochemical study. Comp Clin Pathol 22, 441–447 (2013). https://doi.org/10.1007/s00580-012-1430-9
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DOI: https://doi.org/10.1007/s00580-012-1430-9