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Rat peritoneal mast cells respond to various secretagogues, such as ionophore A23187, concanavalin A (Ig E receptor cross-bridging) and compound 48/80 (membrane perturbing), to secrete histamine and to liberate arachidonic acid. Arachidonic acid release was made identifiable by pretreatment with BW755C, an inhibitor of both lipoxygenase and cyclo-oxygenase. The extent of arachidonic acid release varied among these three secretagogues. A23187 appeared to be most potent, whereas compound 48/80 was weakest. The sources of released arachidonic acids may be different depending on the types of stimulants. The stimulation with A23187 released arachidonic acid mainly from phosphatidylcholine and triacylglycerol. After treatment with concanavalin A and compound 48/80, in addition to phosphatidylcholine, phosphatidylinositol also appeared to serve as a donor of arachidonic acid.
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