Abstract
Drug resistance is a severe limitation of chemotherapy of various malignancies. In particular efflux transporters of the ATP-binding cassette family such as ABCB1 (P-glycoprotein), the ABCC (multidrug resistance-associated protein) family, and ABCG2 (breast cancer resistance protein) have been identified as major determinants of chemoresistance in tumor cells. Bioavailability depends not only on the activity of drug metabolizing enzymes but also to a major extent on the activity of drug transport across biomembranes. They are expressed in the apical membranes of many barrier tissues such as the intestine, liver, blood-brain barrier, kidney, placenta, testis, and in lymphocytes, thus contributing to plasma, liquor, but also intracellular drug disposition. Since expression and function exhibit a broad variability, it was hypothesized that hereditary variances in the genes of membrane transporters could explain at least in part interindividual differences of pharmacokinetics of a variety of anticancer drugs and many others contributing to the clinical outcome of certain leukemias and further malignancies.
MeSH terms
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ATP Binding Cassette Transporter, Subfamily B
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ATP Binding Cassette Transporter, Subfamily B, Member 1 / genetics
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ATP Binding Cassette Transporter, Subfamily B, Member 1 / metabolism
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ATP Binding Cassette Transporter, Subfamily G, Member 2
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ATP-Binding Cassette Transporters / genetics
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ATP-Binding Cassette Transporters / metabolism*
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Animals
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Antineoplastic Agents / metabolism
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Antineoplastic Agents / therapeutic use
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Cell Line
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Drug Resistance, Multiple / physiology
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Drug Resistance, Neoplasm / physiology*
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Genetic Predisposition to Disease
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Genetic Variation
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Humans
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Multidrug Resistance-Associated Protein 2
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Multidrug Resistance-Associated Proteins / genetics
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Multidrug Resistance-Associated Proteins / metabolism
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Neoplasm Proteins / genetics
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Neoplasm Proteins / metabolism
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Neoplasms / drug therapy
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Neoplasms / genetics
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Neoplasms / metabolism*
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Neoplasms / pathology
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Polymorphism, Genetic
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Treatment Outcome
Substances
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ABCB1 protein, human
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ABCG2 protein, human
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ATP Binding Cassette Transporter, Subfamily B
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ATP Binding Cassette Transporter, Subfamily B, Member 1
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ATP Binding Cassette Transporter, Subfamily G, Member 2
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ATP-Binding Cassette Transporters
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Antineoplastic Agents
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Multidrug Resistance-Associated Protein 2
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Multidrug Resistance-Associated Proteins
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Neoplasm Proteins
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multidrug resistance-associated protein 1