title: Formation of lipoxin A by granulocytes from eosinophilic donors.
abstract: The formation of arachidonic acid-derived lipoxygenase products was examined with human granulocytes obtained from eosinophilic donors. These eosinophil-enriched leukocyte populations, challenged in vitro with the ionophore of divalent cations A23187, transformed both exogenous and endogenous sources of arachidonic acid to several lipoxygenase-derived products, including 5(S), 6(R),15(S)-trihydroxy-7,9,13-trans-11-cis-eicosatetraenoic acid (lipoxin A). Lipoxin A was detected and characterized by high-pressure liquid chromatography (HPLC), ultraviolet absorbance, and gas-liquid chromatography-mass spectroscopy. Neither lipoxin B nor 6(S)-LXA was consistently detected in extracts from these incubations. The amounts of lipoxin A formed were proportional to the percentage of eosinophils present in the suspension. The results indicate that granulocytes from eosinophilic donors can generate lipoxin A.
mesh_terms: D001094:Arachidonate 5-Lipoxygenase / Q000378:metabolism; D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000378:metabolism; D000001:Calcimycin / Q000494:pharmacology; D004802:Eosinophilia / Q000473:pathology*; D006098:Granulocytes / Q000187:drug effects / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D006893:Hydroxyeicosatetraenoic Acids / Q000096:biosynthesis*; D044045:Lipoxins; D013189:SRS-A / Q000096:biosynthesis
chemical_list: D001095:Arachidonic Acids; D006893:Hydroxyeicosatetraenoic Acids; D044045:Lipoxins; D013189:SRS-A; C040527:lipoxin A4; D016718:Arachidonic Acid; D000001:Calcimycin; D001094:Arachidonate 5-Lipoxygenase