title: Human alveolar macrophages produce leukotriene B4.
abstract: Human alveolar macrophages obtained by bronchoalveolar lavage were labeled overnight with [3H]arachidonic acid. The cells were stimulated with calcium ionophore A23187, and the 20:4 oxygenated metabolites released into the culture medium were identified by reverse-phase HPLC. Leukotriene B4 was the major 20:4 metabolite produced by these cultures. Leukotriene B4 was identified by its reverse-phase HPLC elution time, its UV spectrum, and its chemotactic and chemokinetic activities for neutrophils. In addition, the macrophage- and neutrophil-derived leukotriene B4 free acids and methyl esters were found to have identical HPLC retention times.
mesh_terms: D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000378:metabolism; D000001:Calcimycin / Q000494:pharmacology; D002478:Cells, Cultured; D002634:Chemotaxis, Leukocyte; D006801:Humans; D007975:Leukotriene B4 / Q000096:biosynthesis*; D008264:Macrophages / Q000378:metabolism*; D011650:Pulmonary Alveoli / Q000166:cytology
chemical_list: D001095:Arachidonic Acids; D007975:Leukotriene B4; D016718:Arachidonic Acid; D000001:Calcimycin