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• W2084587351 abstract "The anesthetics benzyl alcohol and the nonaromatic chloroform and diethyl ether, abolish P‐glycoprotein (Pgp) ATPase activity in a mode that does not fit classical competitive, noncompetitive, or uncompetitive inhibition. At concentrations similar to those required for inhibition of ATPase activity, these anesthetics fluidize membranes leading to twofold acceleration of doxorubicin flip‐flop across lipid membranes and prevent photoaffinity labeling of Pgp with [ 125 I]‐iodoarylazidoprazosin. Similar concentrations of ether proved nontoxic and modulated efflux from Pgp‐overexpressing cells. A similar twofold acceleration of doxorubicin flip‐flop rate across membranes was observed with neutral mild detergents, including Tween 20, Nonidet P‐40 and Triton X‐100, and certain Pgp modulators, such as verapamil and progesterone. Concentrations of these agents, similar to those required for membrane fluidization, inhibited Pgp ATPase activity in a mode similar to that observed with the anesthetics. The mode of inhibition, i.e. lack of evidence for classical enzyme inhibition and the correlation of Pgp ATPase inhibition with membrane fluidization over a wide range of concentrations and structures of drugs favors the direct inhibition of Pgp ATPase activity by membrane fluidization. The unusual sensitivity of Pgp to membrane fluidization, as opposed to acceleration of ATPase activity of ion transporters, could fit the proposed function of Pgp as a ‘flippase’, which is in close contact with the membrane core." @default.
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• W2084587351 date "1999-01-01" @default.
• W2084587351 modified "2023-09-25" @default.
• W2084587351 title "Membrane fluidization by ether, other anesthetics, and certain agents abolishes P-glycoprotein ATPase activity and modulates efflux from multidrug-resistant cells" @default.
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• W2084587351 doi "https://doi.org/10.1046/j.1432-1327.1999.00037.x" @default.
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