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Chronobiology International
The Journal of Biological and Medical Rhythm Research
Volume 21, 2004 - Issue 4-5
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Original

Chronotoxicity of Nedaplatin in Rats

, , , , & , M.D.
Pages 601-611 | Received 14 Dec 2003, Accepted 13 May 2004, Published online: 07 Jul 2009
 

Abstract

Chronotoxicologic profiles of nedaplatin, a platinum compound, were evaluated in rats maintained under a 12 light/12 dark cycle with light from 07:00 h to 19:00 h. Nedaplatin (5 mg/kg) was injected intravenously, once a week for 5 weeks at 08:00 h or 20:00 h. The suppression of body weight gain and reduction of creatinine clearance were significantly greater with the 20:00 h than 08:00 h treatment. Accumulation of nedaplatin in the renal cortex and bone marrow were also greater with 20:00 h treatment. There were significant relationships between the nedaplatin content in the kidney and bone marrow and degree of injury to each. These results suggest that the nedaplatin-induced toxicity depends on its dosing-time, and it is greater with treatment at 20:00 h, during the active phase. The dosing-time dependency in the accumulation of nedaplatin in the tissue of the organs might be involved in this chronotoxicologic phenomenon.

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