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- W2153500833 abstract "Efflux pump inhibitors (EPIs) are attractive compounds to reverse multidrug-resistance in clinically relevant bacterial pathogens. In this study we tested the ability of the neuroleptic drug pimozide to inhibit the Escherichia coli AcrAB-TolC efflux pump, whose overproduction confers resistance to various antimicrobial agents. A real-time Nile red efflux assay in the AcrAB - overproducing strain 3-AG100 revealed that pimozide was capable of full inhibition of this pump at a concentration of 100 µM, which is far below its intrinsic MIC (>1mM). However, MIC assay demonstrated very little effect of pimozide with regard to reduction in MICs of various antimicrobial compounds. Only oxacillin MICs were reduced twofold in the presence of pimozide at 100 and 200 µM. Since pimozide did considerably enhance accumulation of ethidium bromide in a fluorescence assay, ethidium bromide MIC assays in the presence and absence of this putative EPI were performed. They revealed that pimozide was able to reduce the MICs of ethidium bromide by 4-fold. In line with previous reports we suggest that the capability of EPIs to restore the susceptibility to antimicrobial agents can be highly substrate-specific due to different substrate binding sites." @default.
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- W2153500833 date "2013-03-22" @default.
- W2153500833 modified "2023-09-23" @default.
- W2153500833 title "Pimozide Inhibits the AcrAB-TolC Efflux Pump in Escherichia coli" @default.
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- W2153500833 doi "https://doi.org/10.2174/1874285801307010083" @default.
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