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The mixed leukocyte population obtained from the peritoneum of the August rat is a potentially important experimental model of inherent eosinophilia that has not been well characterized. In the present study, isolated cell preparations generated a concentration-dependent release of leukotriene (LT) C(4) when exposed to the Ca(2+) ionophore A23187, reaching maximal stimulation at 5.0 muM. This response was inhibited by the 5-lipoxygenase activating protein antagonist MK-886 (0.1 muM), nominally Ca(2+) and Mg(2+)-free incubation media and by activation of protein kinase C via phorbol 12-myristate 13-acetate (50 nM). These findings establish a model system for investigating LTC(4) profiles contingent with innate peritoneal eosinophilia and are consistent with the hypothesis that cellular LTC(4) biosynthesis is phosphoregulated.

Leukotriene C4biosynthesis in isolated August rat peritoneal leukocytes