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Inhibition of erythrocyte glutathione conjugate transport by polyethoxylated surfactants
Author(s) -
Board Philip G.
Publication year - 1993
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(93)81182-y
Subject(s) - glutathione , chemistry , pulmonary surfactant , biochemistry , transporter , mediated transport , membrane transport , atp binding cassette transporter , conjugate , erythrocyte membrane , p glycoprotein , membrane , enzyme , multiple drug resistance , gene , mathematical analysis , mathematics , antibiotics
The surfactant Cremophor EL has recently been shown to reverse the multiple drug resistance phenotype (mdrl) created by over‐expression of P glycoprotein, an ATP dependent membrane transport system. Oxidized glutathione and glutathione thioethers are transported out of cells by ATP dependent systems that are distinct from the P glycoprotein pathway. The present study shows that Cremophor EL and a number of other polyethoxylated surfactants inhibit the transport of 2,4‐dinitrophenyl glutathione out of intact erythrocytes. The inhibition is not complete, suggesting that this inhibition may differentiate between different glutathione transporters. ATP concentrations are maintained within the cells incubated with Cremophor EL indicating that the inhibition is not mediated by metabolic deprivation.