| Literature DB >> 7915193 |
G Jedlitschky1, I Leier, U Buchholz, M Center, D Keppler.
Abstract
The ATP-dependent transport of the endogenous glutathione conjugate leukotriene C4 (LTC4) was more than 25-fold higher in membrane vesicles prepared from human leukemia cells (HL60/ADR) overexpressing the multidrug resistance-associated protein than from drug-sensitive parental HL60 cells or revertant cells. Similar results were obtained with S-(2,4-dinitrophenyl)glutathione as substrate. Photoaffinity labeling detected preferentially in the HL60/ADR membranes a 190-kilodalton protein binding [3H]LTC4 and 8-azido[alpha-32P]ATP. The [3H]LTC4-labeled 190-kilodalton protein was immunoprecipitated by an antiserum against the COOH-terminal sequence of multidrug resistance-associated protein. Our results indicate that multidrug resistance-associated protein mediates the ATP-dependent transport of LTC4 and structurally related anionic amphiphilic conjugates.Entities:
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Year: 1994 PMID: 7915193
Source DB: PubMed Journal: Cancer Res ISSN: 0008-5472 Impact factor: 12.701