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Disposition of 14C-labelled 4′-epidoxorubicin and doxorubicin in the rat

A comparative study

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Summary

The disposition of 4′-epi-[14-14C]doxorubicinHCl (4′-epi-[14C]DXR) and [14-14C]doxorubicinHCl ([14C]DXR) was studied in male Sprague-Dawley rats given 1 mg/kg body weight IV. Most of the radioactivity administered was recovered in the faeces (two-thirds of the dose within 6 days after administration), urine accounting for 15% of the 14C given during the same period. A significant amount of radioactivity was also found in expered air. Significantly higher levels of radioactivity were recorded in the plasma (40 min and 4 h) and liver (40 min) in [14C]DXR-treated animals, whereas in animals treated with 4′-epi-[14C]DXR a higher specific radioactivity was found in the kidneys (40 min and 4 h) and bone marrow (40 min). The total tissue residual radioactivity was greater (P (0.05) at 24 h for [14C]DXR (45.8%) than for 4′-epi-[14C]DXR (38.6%).

The main radioactive species in urines were the unchanged drugs. Minor metabolites were represented by a polar fraction, 13-dihydroderivatives, and aglycones. Whereas aglycones represent an important fraction of extractable tissue radioactivity in liver samples of many of the treated animals, the unchanged drug was invariably the major radioactive component in spleen, lung, and kidney. Liver extraction studies showed the presence of significant amounts of bound radioactivity that could be recovered in soluble form only after incubation with deoxyribonuclease.

The main radioactive species present in the bile were the unchanged drug and a polar fraction. The amount of the former was higher in [14C]DXR-treated than in 4′-epi-[14C]DXR-treated animals. On the other hand, partial glucuronidation of 4′-epi-[14C]DXR was deduced on the basis of results of enzymic hydrolysis of bile samples.

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Correspondence to Gian Piero Vicario.

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Arcamone, F., Lazzati, M., Vicario, G.P. et al. Disposition of 14C-labelled 4′-epidoxorubicin and doxorubicin in the rat. Cancer Chemother. Pharmacol. 12, 157–166 (1984). https://doi.org/10.1007/BF00256538

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Keywords

  • Doxorubicin
  • Enzymic Hydrolysis
  • Liver Sample
  • Extractable Tissue
  • Unchanged Drug