Selective inhibition of free arachidonic acid production in activated alveolar macrophages by calmodulin antagonists.
The effect of calmodulin antagonists on the amounts of free fatty acids produced by rabbit alveolar macrophages was determined by fluorometric high-performance liquid chromatography. Opsonized zymosan-induced arachidonic acid production was dramatically suppressed in the presence of W-7 and trifluoperazine without an effect on the production of other fatty acids. Calmodulin antagonists inhibited phospholipase A and abolished the release of arachidonic acid from phospholipids. The present results suggest that a zymosan-sensitive pool of 20:4, which is different from that of other fatty acids, is present in macrophages and that calmodulin antagonists selectively inhibit phospholipase A, which preferentially degrades phospholipids with 20:4.
D000098:Acetophenones / Q000494:pharmacology; D000818:Animals; D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000378:metabolism*; D002147:Calmodulin / Q000037:antagonists & inhibitors*; D002746:Chlorpromazine / Q000494:pharmacology; D002851:Chromatography, High Pressure Liquid; D003571:Cytochalasin B / Q000494:pharmacology; D019787:Linoleic Acid; D008041:Linoleic Acids / Q000378:metabolism; D008262:Macrophage Activation; D008264:Macrophages / Q000187:drug effects / Q000378:metabolism*; D019301:Oleic Acid; D009829:Oleic Acids / Q000378:metabolism; D009895:Opsonin Proteins; D010713:Phosphatidylcholines / Q000378:metabolism; D010716:Phosphatidylinositols / Q000378:metabolism; D010741:Phospholipases A / Q000037:antagonists & inhibitors; D011650:Pulmonary Alveoli / Q000166:cytology*; D011796:Quinacrine / Q000494:pharmacology; D011817:Rabbits; D013449:Sulfonamides / Q000494:pharmacology; D014268:Trifluoperazine / Q000494:pharmacology; D015054:Zymosan / Q000494:pharmacology
D000098:Acetophenones; D001095:Arachidonic Acids; D002147:Calmodulin; D008041:Linoleic Acids; D009829:Oleic Acids; D009895:Opsonin Proteins; D010713:Phosphatidylcholines; D010716:Phosphatidylinositols; D013449:Sulfonamides; D014268:Trifluoperazine; D016718:Arachidonic Acid; D019301:Oleic Acid; D003571:Cytochalasin B; C017967:W 7; D015054:Zymosan; D019787:Linoleic Acid; D010741:Phospholipases A; D011796:Quinacrine; C006821:4-bromophenacyl bromide; D002746:Chlorpromazine