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In isolated rat serosal mast cells, studies with the fluorescent Ca2+ indicator, quin 2, and with [3H]-myoinositol to label endogenous polyphosphoinositides have established that an increase in cytosol Ca2+ levels was obligatory for histamine release by free radicals. No substantial breakdown of phosphatidylinositol and related polyphosphoinositides was associated with generation of the Ca2+ signal and histamine release, suggesting that the release of histamine by free radicals entails different pathways than the calcium-mobilizing receptors linked to polyphosphoinositides as second messengers.

Prostaglandin H Synthetase Activates Xenobiotics into Free Radicals: Histamine Release and Biochemical Characteristics