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• W2029172019 abstract "Abstract Gene amplification and copy number changes play a pivotal role in malignant transformation and progression of human tumor cells by mediating the activation of genes and oncogenes, which are involved in many different cellular processes including development of drug resistance. Since doxorubicin (DX) and methotrexate (MTX) are the two most important drugs for high‐grade osteosarcoma (OS) treatment, the aim of this study was to identify genes gained or amplified in six DX‐ and eight MTX‐resistant variants of the human OS cell lines U‐2OS and Saos‐2, and to get insights into the mechanisms underlying the amplification processes. Comparative genomic hybridization techniques identified amplification of MDR1 in all six DX‐resistant and of DHFR in three MTX‐resistant U‐2OS variants. In addition, progressive gain of MLL was detected in the four U‐2OS variants with higher resistance levels either to DX or MTX, whereas gain of MYC was found in all Saos‐2 MTX‐resistant variants and the U‐2OS variant with the highest resistance level to DX. Fluorescent in situ hybridization revealed that MDR1 was amplified in U‐2OS and Saos‐2/DX‐resistant variants manifested as homogeneously staining regions and double minutes, respectively. In U‐2OS/MTX‐resistant variants, DHFR was amplified in homogeneously staining regions, and was coamplified with MLL in relation to the increase of resistance to MTX. Gene amplification was associated with gene overexpression, whereas gene gain resulted in up‐regulated gene expression. These results indicate that resistance to DX and MTX in human OS cell lines is a multigenic process involving gene copy number and expression changes. © 2008 Wiley‐Liss, Inc." @default.
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• W2029172019 date "2008-12-22" @default.
• W2029172019 modified "2023-10-18" @default.
• W2029172019 title "Mechanisms of gene amplification and evidence of coamplification in drug-resistant human osteosarcoma cell lines" @default.
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• W2029172019 doi "https://doi.org/10.1002/gcc.20640" @default.
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