Abstract
Purpose
To investigate the underlying mechanism of low bioavailabilities of the water-soluble camptothecin derivatives, belotecan and topotecan.
Methods
The bioavailability of belotecan and topotecan in rats was determined following oral administration of each drug at a dose of 5 mg/kg body weight. The vectorial transport of each drug was measured in Caco-2 and engineered MDCK II cells.
Results
The bioavailability of belotecan (11.4%) and topotecan (32.0%) in rats was increased to 61.5% and 40.8%, respectively, by the preadministration of CsA at a dose of 40 mg/kg. Contrary to the absorptive transport, the secretory transport of these drugs across the Caco-2 cell monolayer was concentration-dependent, saturable, and significantly inhibited by the cis presence of verapamil (a P-gp substrate), MK-571 (an MRP inhibitor), bromosulfophthalein (BSP, an MRP2 inhibitor), fumitremorgin C (FTC, a BCRP inhibitor) and cyclosporine A (CsA, an inhibitor of P-gp and BCRP, and a substrate of P-gp) suggesting the involvement of these transporters, which could be further confirmed in MDCKII/P-gp, MDCKII/MRP2 and MDCKII/BCRP cells.
Conclusion
The involvement of secretory transporters P-gp, MRP2 and BCRP, particularly for belotecan, as well as a low passive permeability, appears to be responsible for the low bioavailability of belotecan and topotecan.
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Abbreviations
- ABC:
-
ATP-binding cassette
- BCRP:
-
breast cancer resistance protein
- BSP:
-
bromosulfophtahlein
- CPT:
-
20-(s)-camptothecin
- CsA:
-
cyclosporine A
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- FTC:
-
fumitremorgin
- HBSS:
-
Hank’s balanced salt solution
- HEPES:
-
N-2-hydroxyethylpiperazine-N′-2-ethanesulfonic acid
- MDCK:
-
Mardine–Darby canine kidney
- MK-571:
-
3-([{3-(2-[7-chloro-2-quinolinyl]ethyl)phenyl}-{(3-dimethylamino-3-oxopropyl)-thio}-methyl]-thio) propanoic acid
- MRP2:
-
multidrug resistance protein 2
- P-gp:
-
P-glycoprotein
- SD:
-
Sprague–Dawley
- TEER:
-
transepithelial electrical resistance
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Acknowledgments
We sincerely thank Dr. Borst at The Netherlands Cancer Institute (Amsterdam, The Netherlands) for providing MDCKII/wt, MDCKII/P-gp, MDCKII/MRP2, and MDCKII/BCRP cells. This work was supported by the Korea Science and Engineering Foundation (KOSEF) through the National Research Lab. Program funded by the Ministry of Science and Technology (No.R0A2006000102900).
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Hong Li and Hyo-Eon Jin have contributed equally to this work.
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Li, H., Jin, HE., Kim, W. et al. Involvement of P-glycoprotein, Multidrug Resistance Protein 2 and Breast Cancer Resistance Protein in the Transport of Belotecan and Topotecan in Caco-2 and MDCKII Cells. Pharm Res 25, 2601–2612 (2008). https://doi.org/10.1007/s11095-008-9678-0
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DOI: https://doi.org/10.1007/s11095-008-9678-0