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- Title
The elimination of MTC-220, a novel anti-tumor agent of conjugate of paclitaxel and muramyl dipeptide analogue, in rats.
- Authors
You, Feng; Hu, Jinping; Li, Xue; Li, Yan
- Abstract
Purpose: MTC-220, a conjugate of paclitaxel and muramyl dipeptide analogue, was reported to exhibit anti-tumor ability and anti-metastatic effect. The aim of present study was to investigate the elimination of MTC-220 and the related mechanisms in rats. Methods: The excretion of MTC-220 and its metabolites in bile and urine were determined in rats after intravenous administration at 4 mg/kg. Caco-2 cell monolayer, in situ liver perfusion model and in vivo pharmacokinetics with selected inhibitors in rats were used to confirm the involvement of hepatic transporters in the elimination of MTC-220. The metabolic stability of MTC-220 was assessed by the incubation with rat liver microsomes and plasma. Results: Approximately 72 % of MTC-220 was excreted into bile and less than 0.02 % into urine after administration in rats. The Caco-2 cell monolayer was impermeable to MTC-220. In in situ liver perfusion model, the hepatic extraction ratio of MTC-220 was reduced to 40 % of control in the presence of rifampicin, an Oatps inhibitor, and the cumulative biliary excretion rates of MTC-220 were reduced to 52.9, 71.5 and 62.9 % of control when concomitant perfusion with probenecid, novobiocin and verapamil, the inhibitors of Mrp2, Bcrp and P-gp, respectively. Co-administration of rifampicin, probenecid, novobiocin and verapamil with MTC-220 increased the AUC and decreased the CL of MTC-220 in certain extents in rats. MTC-220 remained metabolically intact in rat liver microsomes, but less stable in plasma incubation. Conclusions: In summary, the elimination of MTC-220 was mainly through the biliary excretion in unchanged form in rats. Liver transporters including Oatps, Mrp2, Bcrp and P-gp might be all involved in the hepatic elimination of MTC-220. MTC-220 exhibited the high metabolic stability in liver microsomes, but less stable in plasma. The esterases might involve in the metabolism of MTC-220 in plasma.
- Subjects
ANTINEOPLASTIC agents; PACLITAXEL; METABOLITES; NOVOBIOCIN; DRUG administration; VERAPAMIL; LABORATORY rats
- Publication
Cancer Chemotherapy & Pharmacology, 2013, Vol 71, Issue 6, p1453
- ISSN
0344-5704
- Publication type
Article
- DOI
10.1007/s00280-013-2144-7