title: Expression profiling of osteosarcoma cells transfected with MDR1 and NEO genes: regulation of cell adhesion, apoptosis, and tumor suppression-related genes.
abstract: The expression patterns of the osteosarcoma cell line U-2 OS, and three derived subclones containing stably transfected MDR1, NEO and MDR1/NEO genes were compared using cDNA microarrays comprising 8976 known genes and expressed sequenced tags. Data provided new insights into three critical issues. First, MDR1 overexpression was associated with altered expression of genes related to several cellular pathways, including (a). drug influx/efflux (eg, dynamin 3), (b). metabolic enzymes (eg, monoamine oxidase A), (c). cell adhesion (eg, EPCAM), (d). apoptotic signaling (eg, I-TRAF), (e). senescence (eg, telomerase RNA binding protein staufen), (f). tumor suppression-related genes (eg, KISS-1 and ephrin B3), and (g). immune system receptors (eg, LENG2). MDR1, EPCAM, and ephrin B3 expression was confirmed by immunohistochemistry. Second, MDR1 transfected cells selected with either doxorubicin or neomycin showed distinct expression profiles that could be related to differential selection. Moreover, hierarchical clustering indicated that cells transfected with MDR1 alone, or cotransfected with NEO, displayed more closely related expression profiles than cells transfected only with NEO. Third, transfection with NEO and selection with neomycin produced a considerable number of expression changes within the cell. This study further elucidates the genetic events associated with MDR1 expression and identifies novel targets associated with multidrug resistance.
authors.affiliation: Memorial Sloan-Kettering Cancer Center, Albert Einstein College of Medicine,York, New York 10021, USA.
authors.forename: Marta
authors.initials: M
authors.lastname: Sanchez-Carbayo
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Belbin
authors.forename: Katia
authors.initials: K
authors.lastname: Scotlandi
authors.forename: Michael
authors.initials: M
authors.lastname: Prystowsky
authors.forename: Nicola
authors.initials: N
authors.lastname: Baldini
authors.forename: Geoffrey
authors.initials: G
authors.lastname: Childs
authors.forename: Carlos
authors.initials: C
authors.lastname: Cordon-Cardo
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000378:metabolism; D017209:Apoptosis / Q000235:genetics*; D002448:Cell Adhesion / Q000235:genetics; D004273:DNA, Neoplasm / Q000032:analysis; D020869:Gene Expression Profiling; D019450:Genes, MDR / Q000235:genetics*; D016147:Genes, Tumor Suppressor; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007150:Immunohistochemistry; D019868:Kanamycin Kinase / Q000235:genetics* / Q000378:metabolism; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods; D012516:Osteosarcoma / Q000235:genetics* / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D012334:RNA, Neoplasm / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014162:Transfection; D014407:Tumor Cells, Cultured
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D004273:DNA, Neoplasm; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D019868:Kanamycin Kinase