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- W2021857013 abstract "Multidrug-resistant clones of human osteosarcoma MNNG/HOS and MG63 cells were isolated by stepwise selection on exposure to increasing doses of doxorubicin (DXR). The final clones MNNG/HOS/DXR1000 and MG63/DXR1000, established after ethylmethane sulfonate mutagenesis, showed 96-fold and 121-fold higer resistance to DXR than their parental cell lines. They were also cross-resistant to vincristine, but not to cisplatinum or methotrexate. The levels of multidrug-resistance-1 (MDR1) mRNA expression increased gradually according to the concentration of DXR in both cell lines. Although the parental MNNG/HOS cells expressed a low level of MDR1 mRNA, the parental MG63 cells showed no MDR1 expression. The IC50 values of MNNG/HOS and its resistant variant to DXR were higher than those of MG63 and its resistant clone. Multidrug-resistant associated protein (MRP) mRNA expression was detected in MNNG/HOS or MG63 parental cell lines, and in their resistant variants. MG63 and its resistant variants revealed stable expression of MRP, whereas the resistant phenotype of MNNG/HOS showed decreased MRP expression, compared to its parental cell line. No alteration in the levels of hepatocyte growth factor (HGF) or its receptor c-MET was recognized between parental lines and their resistant variants. The results indicate that our DXR-resistant variants of MNNG/HOS and MG63 reveal a classical MDR phenotype and can offer a model with which to investigate the mechanisms of multidrug resistance in osteosarcoma." @default.
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- W2021857013 date "2000-07-01" @default.
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- W2021857013 title "Establishment of new multidrug-resistant human osteosarcoma cell lines." @default.
- W2021857013 doi "https://doi.org/10.3892/or.7.4.859" @default.
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