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Daunorubicin and daunorubicinol pharmacokinetics in plasma and tissues in the rat

  • Original Article
  • Anthracyclines, Daunorubicin, Daunorubicinol, Pharmacokinetics, Rat, Tissue Concentrations
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Abstract

Recent evidence suggests that 13-hydroxy metabolites of anthracyclines may contribute to cardiotoxicity. This study was designed to determine the pharmacokinetics of daunorubicin and the 13-hydroxy metabolite daunorubicinol in plasma and tissues, including the heart. Fisher 344 rats received 5 mg kg−1 daunorubicin i.v. by bolus injection. Rats were killed at selected intervals for up to 1 week after daunorubicin administration for determination of concentrations of daunorubicin and daunorubicinol in the plasma, heart, liver, kidney, lung, and skeletal muscle. Peak concentrations of daunorubicin were higher than those of daunorubicinol in the plasma (133±7 versus 36±2 ng ml−1;P<0.05), heart (15.2±1.4 versus 3.4±0.4 μg g−1;P<0.05), and other tissues. However, the apparent elimination half-life of daunorubicinol was longer than that of daunorubicin in most tissues, including the plasma (23.1 versus 14.5 h) and heart (38.5 versus 19.3 h). In addition, areas under the concentration/time curves (AUC) obtained for daunorubicinol exceeded those found for daunorubicin in almost all tissues, with the ratios being 1.9 in plasma and 1.7 in the heart. The ratio of daunorubicinol to daunorubicin concentrations increased dramatically with time from <1 at up to 1 h to 87 at 168 h in cardiac tissue. Thus, following daunorubicin injection, cumulative exposure (AUC) to daunorubicinol was greater than that to daunorubicin in the plasma and heart. If daunorubicinol has equivalent or greater potency than daunorubicin in causing impairment of myocardial function, it may make an important contribution to the pathogenesis of cardiotoxicity.

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Cusack, B.J., Young, S.P. & Olson, R.D. Daunorubicin and daunorubicinol pharmacokinetics in plasma and tissues in the rat. Cancer Chemother. Pharmacol. 35, 213–218 (1995). https://doi.org/10.1007/BF00686550

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  • DOI: https://doi.org/10.1007/BF00686550

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