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Lipoxin A and lipoxin B (LXA and LXB) are formed from arachidonic acid by leukocyte 5- and 15-lipoxygenases. We have assessed the effects of synthetic lipoxins on functional responses of human granulocytes. LXA stimulated migration at 1 nM. The effect was highly stereospecific, since e.g. 6S-LXA and LXB were less active than LXA. Neither synthetic LXA nor several of its stereoisomers provoked degranulation or aggregation. LXB and its isomers did not induce any of these functional responses. These results indicate that migratory granulocyte responses to LXA are highly stereospecific.
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