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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1992 Dec 1;89(23):11598–11602. doi: 10.1073/pnas.89.23.11598

Leukotriene C4 uses a probenecid-sensitive export carrier that does not recognize leukotriene B4.

B K Lam 1, K Xu 1, M B Atkins 1, K F Austen 1
PMCID: PMC50600  PMID: 1333613

Abstract

The export of leukotriene (LT) C4 from human eosinophils, a carrier-mediated process that is temperature-dependent and saturable, was characterized further in eosinophils and in two human leukemia cell lines that do not present an intact 5-lipoxygenase pathway. In eosinophils, KG-1 cells, and dimethyl sulfoxide (DMSO)-differentiated HL-60 cells, the respective Q10 values for temperature-dependent LTC4 export were 3.7, 3.3, and 3.4 and for energy of activation were 28.2 kcal/mol, 23.0 kcal/mol, and 27.8 kcal/mol (1 kcal = 4.18 kJ). When human eosinophils, KG-1 cells, and DMSO-differentiated HL-60 cells were preloaded with defined amounts of intracellular LTC4 by incubation with LTA4 and with incremental amounts of a glutathione conjugate, S-dinitrophenyl glutathione (GS-DNP) by sequential incubation with 1-chloro-2,4-dinitrobenzene, GS-DNP inhibited the export of LTC4 in a dose-dependent manner. By plotting the ratio of total GS-DNP (cell retained plus released) to the sum of total GS-DNP plus total LTC4 against the percentage inhibition of LTC4 release, IC40 values of 0.839, 0.803, and 0.841 were obtained for eosinophils, KG-1 cells, and DMSO-differentiated HL-60 cells, respectively. When cells preloaded with LTC4 were resuspended in incremental concentrations of the organic acid transport inhibitor, probenecid, there was a dose-dependent decrease in LTC4 release; GS-DNP and probenecid inhibited LTC4 release in a cumulative fashion, whereas neither inhibited the release of LTB4 from preloaded nondifferentiated HL-60 cells. Therefore, LTC4 export from cells of bone marrow origin occurs through a probenecid-sensitive membrane carrier shared by other glutathione conjugates and distinct from the LTB4 carrier export system.

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Selected References

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