P-glycoprotein inhibition by the multidrug resistance-reversing agent MS-209 enhances bioavailability and antitumor efficacy of orally administered paclitaxel

Cancer Chemotherapy and Pharmacology
Yoshimitsu KimuraOsamu Nakanishi

Abstract

Recent studies in humans and mice have demonstrated that intestinal P-glycoprotein plays a causative role in the limited absorption of orally administered paclitaxel. Multidrug resistance (MDR)-reversing agents, such as cyclosporin A and PSC 833, are known to increase the systemic exposure to orally administered paclitaxel by enhancing absorption in the intestinal tract and decreasing elimination via the biliary tract. In this study, we demonstrated that coadministration of the MDR-reversing agent MS-209, which is known to inhibit P-glycoprotein function by direct interaction, improved the bioavailability of orally administered paclitaxel and consequently enhanced its antitumor activity. The pharmacokinetics of paclitaxel were examined by measuring [(3)H]paclitaxel in plasma drawn from rats and mice given the drug with or without MS-209. The influence of MS-209 on the intestinal transport of [(3)H]paclitaxel was studied using a human colorectal cancer cell line, Caco-2. The in vivo efficacy of orally administered paclitaxel in combination with MS-209 was further evaluated in B16 melanoma-bearing mice. The plasma concentration of [(3)H]paclitaxel following oral administration was significantly increased by coadministration of MS...Continue Reading

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