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The temporal variation in the nephrotoxicity of low doses of isepamicin was studied in male Sprague-Dawley rats treated with a single daily intraperitoneal injection of saline (NaCl, 0.9%) or isepamicin (80 mg/kg of body weight) at either 0800, 1400, 2000, or 0200 h for 4 and 10 days. On day 10, the cellular regeneration (incorporation of [3H] thymidine into DNA of renal cortex) and cortical accumulation of isepamicin were significantly higher in animals treated at 1400 h than at 0200 h (P &lt; 0.01). Immunogold labeling studies showed that isepamicin was essentially localized in the lysosomes of proximal tubular cells in all treated groups, but the density of the gold particles over the lysosomes was higher in animals treated at 1400 than at 0200 h. The results of the present study show that the renal toxicity of isepamicin was maximal at 1400 h (midlight period) and minimal at 0200 h (middark period).

Temporal variation in nephrotoxicity of low doses of isepamicin in rats