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Experimental Therapeutics |
Medicine Branch [M. B., T. L., K. N., C. T., R. R., T. F., S. E. B] and Laboratory of Molecular Pharmacology, Developmental Therapeutics Program [G. K., Y. P.], Division of Cancer Treatment, National Cancer Institute, NIH, Bethesda, Maryland 20892; Heritable Disorders Branch, National Institute of Child Health and Human Development, NIH, Bethesda, Maryland 20892 [M. C.]
The mitoxantrone resistance (MXR) gene encodes a recently characterized ATP-binding cassette half-transporter that confers multidrug resistance. We studied resistance to the camptothecins in two sublines expressing high levels of MXR: S1-M1-80 cells derived from parental S1 colon cancer cells and MCF-7 AdVp3000 isolated from parental MCF-7 breast cancer cells. Both cell lines were 400- to 1000-fold more resistant to topotecan, 9-amino-20(S)-camptothecin, and the active metabolite of irinotecan, 7-ethyl-10-hydroxycamptothecin (SN-38), than their parental cell lines. The cell lines demonstrated much less resistance to camptothecin and to several camptothecin analogues. Reduced accumulation and energy-dependent efflux of topotecan was demonstrated by confocal microscopy. A significant reduction in cleavable complexes in the resistant cells could be observed after SN-38 treatment but not after camptothecin treatment. In addition to topotecan and SN-38, MXR-overexpressing cells are highly resistant to mitoxantrone and epirubicin. Because these compounds are susceptible to glucuronidation, we examined UDP-glucuronosyltransferase (UGT) activity in parental and resistant cells by TLC. Glucuronides were found at equal levels in both parental and resistant colon cancer cell lines for epirubicin and to a lesser extent for SN-38 and mitoxantrone. Low levels of glucuronidation could also be detected in the resistant breast cancer cells. These results were confirmed by analysis of the UGT1A family mRNAs. We thus conclude that colon and breast cancer cells have a capacity for glucuronidation that could contribute to intrinsic drug resistance in colon cancer cells and may be acquired in breast cancer cells. The lack of selection for higher levels of UGT capacity in the colon cells suggests that high levels of expression of MXR alone are sufficient to confer resistance to the camptothecins.
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M. P. Gamcsik, M. S. Kasibhatla, D. J. Adams, J. L. Flowers, O. M. Colvin, G. Manikumar, M. Wani, M. E. Wall, G. Kohlhagen, and Y. Pommier Dual Role of Glutathione in Modulating Camptothecin Activity: Depletion Potentiates Activity, but Conjugation Enhances the Stability of the Topoisomerase I-DNA Cleavage Complex Mol. Cancer Ther., November 1, 2001; 1(1): 11 - 20. [Abstract] [Full Text] [PDF] |
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S. Jacob, M. Aguado, D. Fallik, and F. Praz The Role of the DNA Mismatch Repair System in the Cytotoxicity of the Topoisomerase Inhibitors Camptothecin and Etoposide to Human Colorectal Cancer Cells Cancer Res., September 1, 2001; 61(17): 6555 - 6562. [Abstract] [Full Text] [PDF] |
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Y. Honjo, C. A. Hrycyna, Q.-W. Yan, W. Y. Medina-Perez, R. W. Robey, A. van de Laar, T. Litman, M. Dean, and S. E. Bates Acquired Mutations in the MXR/BCRP/ABCP Gene Alter Substrate Specificity in MXR/BCRP/ABCP-overexpressing Cells Cancer Res., September 1, 2001; 61(18): 6635 - 6639. [Abstract] [Full Text] [PDF] |
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P. Perego, M. De Cesare, P. De Isabella, N. Carenini, G. Beggiolin, G. Pezzoni, M. Palumbo, L. Tartaglia, G. Pratesi, C. Pisano, et al. A Novel 7-modified Camptothecin Analog Overcomes Breast Cancer Resistance Protein-associated Resistance in a Mitoxantrone-selected Colon Carcinoma Cell Line Cancer Res., August 1, 2001; 61(16): 6034 - 6037. [Abstract] [Full Text] [PDF] |
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R. H. J. Mathijssen, R. J. van Alphen, J. Verweij, W. J. Loos, K. Nooter, G. Stoter, and A. Sparreboom Clinical Pharmacokinetics and Metabolism of Irinotecan (CPT-11) Clin. Cancer Res., August 1, 2001; 7(8): 2182 - 2194. [Abstract] [Full Text] [PDF] |
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S. K. Diah, P. K. Smitherman, J. Aldridge, E. L. Volk, E. Schneider, A. J. Townsend, and C. S. Morrow Resistance to Mitoxantrone in Multidrug-resistant MCF7 Breast Cancer Cells: Evaluation of Mitoxantrone Transport and the Role of Multidrug Resistance Protein Family Proteins Cancer Res., July 1, 2001; 61(14): 5461 - 5467. [Abstract] [Full Text] [PDF] |
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H. Komatani, H. Kotani, Y. Hara, R. Nakagawa, M. Matsumoto, H. Arakawa, and S. Nishimura Identification of Breast Cancer Resistant Protein/Mitoxantrone Resistance/Placenta-Specific, ATP-binding Cassette Transporter as a Transporter of NB-506 and J-107088, Topoisomerase I Inhibitors with an Indolocarbazole Structure Cancer Res., April 1, 2001; 61(7): 2827 - 2832. [Abstract] [Full Text] |
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M. Maliepaard, M. A. van Gastelen, A. Tohgo, F. H. Hausheer, R. C. A. M. van Waardenburg, L. A. de Jong, D. Pluim, J. H. Beijnen, and J. H. M. Schellens Circumvention of Breast Cancer Resistance Protein (BCRP)-mediated Resistance to Camptothecins in Vitro Using Non-Substrate Drugs or the BCRP Inhibitor GF120918 Clin. Cancer Res., April 1, 2001; 7(4): 935 - 941. [Abstract] [Full Text] |
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U. Vanhoefer, A. Harstrick, W. Achterrath, S. Cao, S. Seeber, and Y. M. Rustum Irinotecan in the Treatment of Colorectal Cancer: Clinical Overview J. Clin. Oncol., March 1, 2001; 19(5): 1501 - 1518. [Abstract] [Full Text] [PDF] |
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C. Erlichman, S. A. Boerner, C. G. Hallgren, R. Spieker, X.-Y. Wang, C. D. James, G. L. Scheffer, M. Maliepaard, D. D. Ross, K. C. Bible, et al. The HER Tyrosine Kinase Inhibitor CI1033 Enhances Cytotoxicity of 7-Ethyl-10-hydroxycamptothecin and Topotecan by Inhibiting Breast Cancer Resistance Protein-mediated Drug Efflux Cancer Res., January 1, 2001; 61(2): 739 - 748. [Abstract] [Full Text] |
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R. W. Robey, W. Y. Medina-Pérez, K. Nishiyama, T. Lahusen, K. Miyake, T. Litman, A. M. Senderowicz, D. D. Ross, and S. E. Bates Overexpression of the ATP-binding Cassette Half-Transporter, ABCG2 (MXR/BCRP/ABCP1), in Flavopiridol-resistant Human Breast Cancer Cells Clin. Cancer Res., January 1, 2001; 7(1): 145 - 152. [Abstract] [Full Text] |
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