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. 1987 Oct 1;247(1):95–99. doi: 10.1042/bj2470095

A major role for phospholipase A2 in antigen-induced arachidonic acid release in rat mast cells.

K Yamada 1, Y Okano 1, K Miura 1, Y Nozawa 1
PMCID: PMC1148374  PMID: 3120703

Abstract

Cross-linking of IgE receptors by antigen stimulation leads to histamine release and arachidonic acid release in rat peritoneal mast cells. Investigators have reported a diverse distribution of [3H]arachidonate that is dependent on labelling conditions. Mast cells from rat peritoneal cavity were labelled with [3H]arachidonic acid for different periods of time at either 30 or 37 degrees C. Optimum labelling was found to be after 4 h incubation with [3H]arachidonate at 30 degrees C, as judged by cell viability (Trypan Blue uptake), responsiveness (histamine release) and distribution of radioactivity. Alterations in 3H-radioactivity distribution in mast cells labelled to equilibrium were examined on stimulation with antigen (2,4-dinitrophenyl-conjugated Ascaris suum extract). The results indicated that [3H]arachidonic acid was lost mainly from phosphatidylcholine and, to a lesser extent, from phosphatidylinositol. A transient appearance of radiolabelled phosphatidic acid and diacylglycerol indicated phosphatidylinositol hydrolysis by phospholipase C. Pretreatment with a phospholipase A2 inhibitor, mepacrine, substantially prevented the antigen-induced liberation of [3H]arachidonic acid from phosphatidylcholine. It can be thus concluded that, in the release of arachidonic acid by antigen-stimulated mast cells, the phospholipase A2 pathway, in which phosphatidylcholine is hydrolysed, serves as the major one, the phospholipase C/diacylglycerol lipase pathway playing only a minor role.

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Selected References

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