PMID: 8613443Mar 1, 1996Paper

Experimental models for the study of drug resistance in osteosarcoma: P-glycoprotein-positive, murine osteosarcoma cell lines

The Journal of Bone and Joint Surgery. American Volume
H TakeshitaH J Mankin

Abstract

P-glycoprotein is an adenosine triphosphate-dependent drug-efflux pump that extrudes drugs from cells and causes drug-resistance. P-glycoprotein is believed to mediate drug-resistance in a wide variety of tumors. In this study, we developed two P-glycoprotein-positive, murine osteosarcoma cell lines that were resistant to Adriamycin (doxorubicin) (MOS/ADR1 and MOS/ADR2). We created the cell lines by short-term pulse exposures of the parent cell line to Adriamycin followed by single-cell cloning. The MOS/ADR1 and MOS/ADR2 cells were sevenfold and eighteenfold more resistant to Adriamycin than the cells from the parent line. Expression of P-glycoprotein, as examined with an immunofluorescence method, was detected in most of the MOS/ADR1 and MOS/ADR2 cells but not in the parent cells. After the cells had been incubated with Adriamycin for one hour, there was less accumulation of the drug in the resistant cell lines than in the parent cell line. The reduced accumulation was due to the increased efflux of Adriamycin. The Adriamycin-resistant cell lines demonstrated greater alkaline phosphatase activity than the parent cell line and produced more differentiated osteoblastic sarcomas in mice. Dose survival studies with use of a tetraz...Continue Reading

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