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  • Title: Effect of AA-861, a 5-lipoxygenase inhibitor, on leukotriene synthesis in human polymorphonuclear leukocytes and on cyclooxygenase and 12-lipoxygenase activities in human platelets.
    Author: Mita H, Yui Y, Shida T.
    Journal: Allergy; 1986 Sep; 41(7):493-8. PubMed ID: 3024521.
    Abstract:
    AA-861, a selective inhibitor of 5-lipoxygenase of arachidonic acid, was tested for ability to inhibit leukotriene C4 and leukotriene B4 synthesis in human polymorphonuclear leukocytes after calcium ionophore stimulation. AA-861 dose-dependently inhibited leukotriene B4 and leukotriene C4 generation in human polymorphonuclear leukocytes; the concentration required to inhibit generation by 50% (IC50) was 3 X 10(-7) M for leukotriene B4 and 1 X 10(-8) M for leukotriene C4. BW-755C inhibited the generation of leukotriene C4 with an IC50 of about 10(-5) M, indicating that AA-861 is about 1,000 times more potent than BW-755C. AA-861 did not affect the activity of either cyclooxygenase or 12-lipoxygenase at a concentration up to 10(-5) M in human platelets. AA-861 did not inhibit histamine release from human basophils. These results indicate that AA-861 selectively inhibits 5-lipoxygenase but not cyclooxygenase or 12-lipoxygenase in human specimens.
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