title: Differentially expressed genes in multidrug resistant variants of U-2 OS human osteosarcoma cells.
abstract: Multidrug resistance (MDR) to anticancer agents is a major barrier to the successful treatment of human osteosarcomas. Current understanding of the genes that contribute to the features of MDR is limited, and the mechanisms remain unclear. Here we applied differential display reverse transcription-polymerase chain reaction (DDRT-PCR) to parental and MDR-variants of U-2 OS human osteosarcoma cells, to clarify the genes involved in the MDR cells, and identified five candidate genes. These are BCRP (breast cancer resistance protein) encoding a transmembrane efflux pump; RB1CC1 (RB1-inducible coiled-coil 1), a tumor suppressor regulating RB1 (retinoblastoma 1) expression; a novel transcriptional variant of dUTPase; SSR2 (beta-signal sequence receptor), which is associated with protein translocation across ER membrane; and HSP105 encoding high molecular mass heat shock proteins. Molecular and biological characterization of these genes will yield further insight into the features between MDR and tumor progression in human osteosarcomas.
authors.affiliation: Department of Clinical Laboratory Medicine, Shiga University of Medical Science, Tsukinowa-cho, Seta, Otsu, Shiga 520-2192, Japan. chano@belle.shiga-med.ac.jp
authors.forename: Tokuhiro
authors.initials: T
authors.lastname: Chano
authors.forename: Kanji
authors.initials: K
authors.lastname: Mori
authors.forename: Katia
authors.initials: K
authors.lastname: Scotlandi
authors.forename: Stefania
authors.initials: S
authors.lastname: Benini
authors.forename: Cristina
authors.initials: C
authors.lastname: Lapucci
authors.forename: Maria Cristina
authors.initials: MC
authors.lastname: Manara
authors.forename: Massimo
authors.initials: M
authors.lastname: Serra
authors.forename: Piero
authors.initials: P
authors.lastname: Picci
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Okabe
authors.forename: Nicola
authors.initials: N
authors.lastname: Baldini
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics / Q000378:metabolism; D000595:Amino Acid Sequence; D001483:Base Sequence; D001859:Bone Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D004317:Doxorubicin / Q000494:pharmacology; D018432:Drug Resistance, Multiple / Q000235:genetics*; D019008:Drug Resistance, Neoplasm / Q000235:genetics*; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000235:genetics*; D012516:Osteosarcoma / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D016133:Polymerase Chain Reaction; D013382:Subtraction Technique; D014407:Tumor Cells, Cultured / Q000187:drug effects / Q000378:metabolism
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D009363:Neoplasm Proteins; D004317:Doxorubicin