Abstract
The functionally predominant constituents of the slow-reacting substance of anaphylaxis (SRS-A), designated leukotrienes C4 and D4 (LTC4 and LTD4), as well as the leucocyte chemotactic factor leukotriene B4 (LTB4) enhance the adherence of human neutrophils to Sephadex G-25. Enhancement of neutrophil adherence was significant at leukotriene concentrations of 3 X 10(-9) M -3 X 10(-7) M, and reached a maximum level for each of the leukotrienes that was similar in magnitude to that evoked by the neutrophil chemotactic peptide N-formyl-methionyl-leucylphenylalanine (FMLP). The leukotrienes and FMLP elicited optimum increases in neutrophil adherence within 1-2 min at 37 degrees. Indomethacin inhibited the increase in neutrophil adherence evoked by LTC4 and LTD4 and the concurrent elevation in the concentration of endogenous thromboxane B2. The smooth muscle contractile and vasoactive factors LTC4 and LTD4, which lack chemotactic activity for leucocytes, are as active as LTB4 in stimulating human neutrophil adherence, and the effect may be mediated in part by neutrophil-derived thromboxane A2.
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Selected References
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