Abstract:
:To identify the source of arachidonic acid utilized for eicosanoid production, rabbit alveolar macrophages were challenged with 1.0 microM 12-O-tetradecanoylphorbol-13-acetate (TPA) or 3.8 microM Ca+2 ionophore A23187 for 3 h. Upon stimulation with TPA, a loss of [3H]arachidonic acid from phosphatidylcholine, phosphatidylethanolamine, lyso(bis)phosphatidic acid, and phosphatidylserine/phosphatidylinositol was observed. Although calcium ionophore stimulated the liberation of arachidonate solely from phosphatidyl-ethanolamine and phosphatidylcholine, it proved to be a poor stimulus for macrophage-synthesis of eicosanoids. Our evidence suggests that degradation of phosphatidylinositol and lyso(bis)phosphatidic acid induced by TPA yields a source of arachidonate which is the preferred substrate for oxidative metabolism by the cyclooxygenase and lipoxygenase pathways.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Cochran FR,Connor JR,Roddick VL,Waite BMdoi
10.1016/0006-291x(85)90487-5subject
Has Abstractpub_date
1985-07-31 00:00:00pages
800-6issue
2eissn
0006-291Xissn
1090-2104pii
0006-291X(85)90487-5journal_volume
130pub_type
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