Abstract
Purpose: It has been reported that a significant portion of the lactone form of 7-ethyl-10-(4-[1-piperidino]-1-piperidino)-carbonyloxy-camptothecin (CPT-11) is excreted into the gastrointestinal lumen via the intestinal membrane and that carboxylesterase activity, which converts CPT-11 to SN-38, was detected in the intestine. It is possible that a reduction in the excretion of CPT-11 lactone into the gastrointestinal lumen induces the gastrointestinal toxicity. The purpose of this study was to investigate the characteristics of transporter(s) that contribute to the jejunal efflux of the lactone form of CPT-11. Methods: The serosal-to-mucosal permeation rate of CPT-11 lactone was investigated in everted sac studies. Results: The secretory transport required metabolic energy and was diminished by sulfobromophthalein (BSP) and 1-naphthol, inhibitors of the ME3277 transport system. However, inhibitors of breast cancer resistance protein (Bcrp), multidrug resistance-associated protein 2 (Mrp2) and P-glycoprotein (P-gp) did not affect the secretion of CPT-11 lactone. Conclusions: The results suggest that a specific transport system, which is identical to the ME3277 transport system, plays a major role in the secretion of CPT-11 lactone.
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Acknowledgments
We thank Dr. S. Miyauchi for his advice on the experimental technique. This work was supported in part by grants from the Akiyama Foundation and the Japan Research Foundation for Clinical Pharmacology.
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Takemoto, I., Itagaki, S., Chiba, M. et al. Characterization of secretory intestinal transport of the lactone form of CPT-11. Cancer Chemother Pharmacol 57, 129–133 (2006). https://doi.org/10.1007/s00280-005-0042-3
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DOI: https://doi.org/10.1007/s00280-005-0042-3