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. 1988 May;64(1):51–59.

Modulation of leukotriene release from human polymorphonuclear leucocytes by PMA and arachidonic acid.

M Raulf 1, W König 1
PMCID: PMC1385185  PMID: 2838420

Abstract

Stimulation of human neutrophils (PMN) with Ca ionophore A23187, opsonized zymosan and formyl-L-methionyl-L-leucyl-phenylalanine (FMLP) led to a time- and dose-dependent release of LTB4, 20-OH-LTB4, 20-COOH-LTB4, 6-trans-LTB4, 12-epi-6-trans LTB4 and LTC4, as detected by reverse-phase HPLC. Preincubation of the PMN suspension in the presence of Ca2+ and Mg2+ with phorbol-12-myristate-13-acetate (PMA) did not release leukotrienes by itself, but modulated the subsequent Ca ionophore-induced leukotriene release. The release of LTC4, 20-OH-LTB4 and 20-COOH-LTB4 was significantly decreased. Lesser effects were observed for the release of LTB4 and the non-enzymatic LTB4 isomers. In contrast, opsonized zymosan and FMLP enhanced the release of LTB4 and LTB4-omega-oxidation products from cells pretreated with PMA. With arachidonic acid as prestimulus, the amounts of the LTB4 isomers (6-trans-LTB4 and 12-epi-6-trans-LTB4) were enhanced significantly on subsequent stimulation with Ca ionophore. Prestimulation of lymphocytes, monocytes and basophilic granulocytes (LMB) with PMA had no significant effects on the ionophore-induced release of LTC4 and LTB4. PMN, but not LMB, suspensions prestimulated with PMA convert exogenously added LTC4 to LTB4 isomers and LTC4 sulphoxide. Our data suggest that preincubation of human granulocytes with PMA modified leukotriene release by activation or inhibition of different metabolic pathways for LTC4 and LTB4.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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