title: [Atypical MDR].
abstract: Multiple drug resistance(MDR) is a major clinical obstacle in cancer chemotherapy. Acquirement of MDR phenotype in cancer cells is often associated with enhanced expression of human MDR-1 gene: MDR-1 gene codes membranous P-glycoprotein which catalyses energy-dependent outward transport of anticancer agents. By contrast, MDR cancer cell lines without overexpression of P-glycoprotein are called as atypical MDR (at MDR) cells. The acquirement of at MDR has been shown to be partly associated with altered DNA topoisomerase II. Furthermore, a new ATP binding cassette (ABC) family, MRP gene has just recently shown to involve in acquirement of at-MDR in cancer cell lines, which do not express both altered topoisomerase II and P-glycoprotein.
authors.affiliation: Dept. of Biochemistry, School of Medicine, Kyusyu University, Fukuoka, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Yokomizo
authors.forename: K
authors.initials: K
authors.lastname: Taniguchi
authors.forename: S
authors.initials: S
authors.lastname: Hasegawa
authors.forename: T
authors.initials: T
authors.lastname: Abe
authors.forename: T
authors.initials: T
authors.lastname: Kubo
authors.forename: Y
authors.initials: Y
authors.lastname: Makino
authors.forename: M
authors.initials: M
authors.lastname: Wada
authors.forename: K
authors.initials: K
authors.lastname: Kohno
authors.forename: M
authors.initials: M
authors.lastname: Kuwano
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D018528:ATP-Binding Cassette Transporters; D000970:Antineoplastic Agents / Q000494:pharmacology*; D002352:Carrier Proteins / Q000235:genetics*; D004250:DNA Topoisomerases, Type II / Q000187:drug effects / Q000502:physiology; D004351:Drug Resistance / Q000235:genetics*; D006801:Humans; D008562:Membrane Glycoproteins / Q000235:genetics; D009369:Neoplasms / Q000188:drug therapy* / Q000235:genetics / Q000473:pathology; D014407:Tumor Cells, Cultured / Q000187:drug effects
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D018528:ATP-Binding Cassette Transporters; D000970:Antineoplastic Agents; D002352:Carrier Proteins; D008562:Membrane Glycoproteins; D004250:DNA Topoisomerases, Type II