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. 1989 Dec;68(4):479–485.

Studies on the uptake, binding and metabolism of leukotriene B4 by human neutrophils.

J Brom 1, W König 1
PMCID: PMC1385534  PMID: 2558070

Abstract

Human polymorphonuclear granulocytes (PMN) generate the inflammatory mediator leukotriene B4 (LTB4) as a response to cell activation. In addition, PMN inactivate LTB4 by omega-oxidation resulting in the formation of 20-OH- and 20-COOH-LTB4. The transport of exogenous LTB4 to the metabolizing enzymes is mediated via high- and low-affinity receptor subsets. Uptake of [3H]LTB4 by the cells was carried out in a time-dependent fashion, reaching maximal values after 5 min of incubation. No additional uptake of [3H]LTB4 then occurred. Prestimulation of PMN with phorbol myristate acetate or sodium fluoride resulted in the loss of high- and low-affinity receptors. Deactivating concentrations of LTB4 specifically reduced the high-affinity receptor subset. Prestimulation of PMN with cytochalasin B or with the membrane fluidizer butanol shifted the low-affinity receptors to the high-affinity state. The polyene antibiotic amphotericin B shifted high-affinity receptors to the low-affinity subset. The changes in the receptor expression pattern correlated with the respective conversion rate of exogenously added LTB4. Our results suggest that the distribution of high- and low-affinity receptors is regulated by GTP-binding proteins, the activation of protein kinase C and the organization of the membrane bilayer. In this way, human neutrophils control the respective level of the lipid mediator LTB4.

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Selected References

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