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. 1997;75(6):810–815. doi: 10.1038/bjc.1997.145

Indomethacin-mediated reversal of multidrug resistance and drug efflux in human and murine cell lines overexpressing MRP, but not P-glycoprotein.

M P Draper 1, R L Martell 1, S B Levy 1
PMCID: PMC2063393  PMID: 9062400

Abstract

Decreased accumulation of the fluorescent dye BCECF [2', 7'-bis-(2-carboxyethyl)-5-(6)- carboxyfluorescein] characterized murine and human multidrug-resistant cell lines overexpressing the multidrug resistance protein (MRP). Indomethacin (10 microM), a known cyclo-oxygenase and glutathione-S-transferase inhibitor as well as a modulator of anion transport, increased accumulation and blocked efflux of BCECF in MRP-expressing murine and human cells. The drug did not affect P-glycoprotein (P-gp)-mediated export of rhodamine 123. The indomethacin effect on BCECF efflux was not reversed by the addition of exogenous prostaglandins, suggesting that the drug acts by a mechanism other than decreasing prostaglandin synthesis. Indomethacin also increased multidrug susceptibility of both murine and human cell lines overexpressing MRP, but not those displaying P-gp-associated resistance. In addition, indomethacin modulated the decreased vincristine accumulation in cells expressing MRP, but not in those expressing P-gp. These data suggest that indomethacin is a specific inhibitor of MRP, possibly functioning by inhibition of glutathione-S-transferase or, alternatively, by direct competition with the drug at the transport site.

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Selected References

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