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Effect of cyclophosphamide pretreatment on the short-term disposition and biliary excretion of adriamycin metabolites in rat

  • Original Articles
  • Cyclophosphamide and Adriamycin Disposition
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Summary

The effect of pretreatment with cyclophosphamide 180 mg/kg upon the short-term disposition of adriamycin in anesthetized rat 4 days later was studied. There was a significant decrease in plasma adriamycin clearance, from 125 to 48 ml/min/kg, and a significant decrease in the apparent volume of the peripheral compartment of adriamycin distribution, from 51.7 to 25.6 l/kg, in cyclophosphamide-pretreated as against control rats. Biliary excretion of adriamycin over 2.5 h was increased significantly by 114% in cyclophosphamide-pretreated rats and there was a small but nonsignificant increase in biliary adriamycinol excretion and a decrease in excretion of adriamycin aglycones. Cyclophosphamide pretreatment was associated with an 83% increase in bile flow. Cyclophosphamide pretreatment had no significant effect upon the utilization of adriamycin or upon the formation of adriamycin metabolites by rat isolated hepatocytes. The results suggest that NADPH-cytochrome P-450 reductase, which is decreased 40% by cyclophosphamide pretreatment, is not rate-limiting in elimination of adriamycin. Biliary excretion of adriamycin is increased when plasma adriamycin clearance is decreased, suggesting that cyclophosphamide pretreatment affects a pathway besides biliary excretion that is responsible for the short-term removal of adriamycin from plasma.

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Hartman, N., Basseches, P.J. & Powis, G. Effect of cyclophosphamide pretreatment on the short-term disposition and biliary excretion of adriamycin metabolites in rat. Cancer Chemother. Pharmacol. 10, 11–15 (1982). https://doi.org/10.1007/BF00257229

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  • DOI: https://doi.org/10.1007/BF00257229

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