Abstract
CPT-11 is a topoisomerase I (Topo I) inhibitor which was initially described as active in multi-drug resistance (MDR) tumors. The MDR phenomenon is characterized by the overexpression of efflux pumps which are able to extrude a range of drugs non-related chemical or functionally. In this work, we treated leukemic cells with CPT-11 300 microM at 24h and compared its cytotoxicity with the activity of efflux pumps and with cell cycle phase. Our findings show that CPT-11 has a potent anti-tumor activity in leukemic cells regardless MDR phenotype and the cell cycle phase, suggesting new avenues to be explored in leukemia treatment.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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ATP Binding Cassette Transporter, Subfamily B, Member 1 / physiology
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Adolescent
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Adult
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Aged
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Aged, 80 and over
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Antineoplastic Agents, Phytogenic / pharmacology*
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Blood Cells / pathology
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Bone Marrow Cells / pathology
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Camptothecin / analogs & derivatives*
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Camptothecin / pharmacology*
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Cell Death / drug effects
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Drug Resistance, Multiple / genetics*
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Female
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Humans
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Interphase
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Irinotecan
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Leukemia / drug therapy
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Leukemia / pathology*
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Leukocytes, Mononuclear / drug effects
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Leukocytes, Mononuclear / pathology
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Male
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Middle Aged
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Multidrug Resistance-Associated Proteins / physiology
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Phenotype
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Rhodamine 123
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Topoisomerase I Inhibitors
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Tumor Cells, Cultured
Substances
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ATP Binding Cassette Transporter, Subfamily B, Member 1
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Antineoplastic Agents, Phytogenic
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Multidrug Resistance-Associated Proteins
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Topoisomerase I Inhibitors
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Rhodamine 123
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Irinotecan
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Camptothecin