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  • Title: [Up-regulation of c-myc expression in MCF-7/Adr human breast cancer cells and its association with resistance against doxorubicin].
    Author: Chen J, Yuan YW, Zhang JR, Zhou DY.
    Journal: Di Yi Jun Yi Da Xue Xue Bao; 2002 Feb; 22(2):124-6. PubMed ID: 12390804.
    Abstract:
    OBJECTIVE: To investigate the expression of c-myc in drug-resistant MCF-7/Adr human breast cancer cells and the counteractive effect of c-myc antisense oligonucleotide on their drug-resistance. METHODS: Flow cytometry was performed to examine c-myc expression in multi-drug resistant MCF-7/Adr cell line and its parental cell line MCF-7. The IC50 value of doxorubicin was evaluated by MTT assay. RESULTS: MCF-7/Adr cell line was shown to have a significantly higher expression rate of c-myc than its parent cell line MCF-7 (70.48% vs 46.02%). The IC50 value of doxorubicin was (22.00+/-1.92) micomol/L in MCF-7/Adr cells, which was significantly decreased to (9.60+/-1.04) micromol/L (P<0.05) after coincubation with 4 micromol/L c-myc antisense oligonecleotide. CONCLUSION: c-myc expression is up-regulated in MCF-7/Adr cells as compared with their parent cell line MCF-7. Inhibition of c-myc expression may partially reverse the resistance of MCF-7/Adr against doxorubicin, suggesting that c-myc may be involved in the mechanism of drug-resistance of tumor cells.
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