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Young, L.C. et al.

Expression of multidrug resistance protein-related genes in lung cancer: correlation with drug response.

Recently, cDNAs have been identified that encode four human proteins (MRP2-5) with structural similarity to the multidrug resistance protein ( MRP). Preliminary studies have shown that levels of mRNAs encoding MRP2, MRP3, and MRP5, are increased in some drug-selected cell lines, but the correlation of MRP2-5 mRNA levels with drug resistance has not been examined. Using a collection of small cell lung cancer (SCLC) and non-SCLC patient samples and unselected cell lines established from patients at various stages of treatment, we examined the expression of MRP2, MRP3, MRP4, and MRP5, as well as MDR1 and MRP, by PCR. The levels of individual mRNAs were correlated with the sensitivity of these cell lines to doxorubicin (DOX), vincristine, VP-16, and cis-diamminedichloroplatinum(II), as determined by a modified MTT assay. Using both SCLC and non-SCLC cell lines, we confirmed the previously observed correlation of MRP mRNA levels with resistance to DOX (B. G. Campling et al., Clin. Cancer Res., 3:115-122, 1997) and found a strong correlation of MRP3 mRNA levels with resistance of the cell lines to DOX. In addition, the mRNA levels of both MRP and MRP3 correlated with resistance of the cell lines to vincristine, VP-16, and cis-diamminedichloroplatinum(II). These findings are consistent with the suggestion that MRP3, like MRP, may contribute to the drug resistance phenotype of lung cancer cells.[1]

References

Expression of multidrug resistance protein-related genes in lung cancer: correlation with drug response. Young, L.C., Campling, B.G., Voskoglou-Nomikos, T., Cole, S.P., Deeley, R.G., Gerlach, J.H. Clin. Cancer Res. (1999) [Pubmed]

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