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. 1982 Oct 1;156(4):1077–1086. doi: 10.1084/jem.156.4.1077

Secretion of leukotriene C and other arachidonic acid metabolites by macrophages challenged with immunoglobulin E immune complexes

PMCID: PMC2186831  PMID: 6759607

Abstract

Resident mouse peritoneal macrophages release the slow-reacting substance leukotriene C (LTC) on exposure to particulate IgE immune complexes. Because these cells lose their responsiveness to an IgE stimulus after 4 h in culture, maximum release of 20:4 metabolites is observed before this time. However, a similar diminution in 20:4 metabolism was not observed with a zymosan stimulus. Freshly explanted cells are deficient in intracellular glutathione (GSH) (12.4 +/- 0.4 pmol/micrograms cell protein), but GSH increases to a steady state value of 30-35 pmol/micrograms of cell protein between 3 and 9 h of culture. Because GSH is required for the synthesis of LTC and prostaglandin (PG)E2, cultures challenged immediately after explanation have a diminished capacity to synthesize these 20:4 metabolites and release prostacyclin as the major product. By 4-5 h in culture, macrophages form significant amounts of LTC and PGE2. Under optimum conditions of maximum responsiveness to an IgE stimulus and GSH content (after 4 h of culture), macrophages challenged with latex beads coated with IgE immune complexes synthesize 1.0 +/- 0.3 pmol of LTC/microgram cell protein (60 +/- 18 pmol/10(6) cells) in addition to prostacyclin (8.2 +/- 0.8 pmol/micrograms cell protein) and PGE2 (4.7 +/- 1.5 pmol/micrograms cell protein). These amounts are quantitatively similar to the arachidonic acid metabolites produced by macrophages challenged with IgG immune complex-coated latex beads or zymosan. These data demonstrate that macrophages produce large quantities of LTC and other 20:4 metabolites in response to particle-bound IgE and antigen, provided that the appropriate in vitro conditions are met. The macrophage might, therefore, be a major source of slow-reacting substance and other 20:4 metabolites generated during IgE-mediated reactions in vivo.

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Selected References

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