title: A new 5-lipoxygenase selective inhibitor derived from Artocarpus communis strongly inhibits arachidonic acid-induced ear edema.
abstract: Natural compounds isolated from the Indonesian plant, Artocarpus communis, inhibit 5-lipoxygenase of cultured mastocytoma cells. One of five compounds, AC-5-1, strongly inhibits 5-lipoxygenase with a half-inhibition dose of 5 +/- 0.12 X 10(-8) M. However, prostaglandin synthesizing activity is not inhibited until 10(-5) M. AC-5-1 is a highly selective inhibitor for 5-lipoxygenase. The AC-5-1 at 10(-5) M inhibits 96% of leukotriene C4 synthesis of mouse peritoneal cells facilitated by calcium-ionophore. Arachidonic acid-induced ear edema of mice, an in vivo inflammatory model, involving leukotriene induction, is strongly inhibited by AC-5-1 in a dose-dependent manner. The inhibition is the strongest of any inhibitors of 5-lipoxygenase reported previously. Since the natural compound AC-5-1 can selectively inhibit 5-lipoxygenase and affect in vivo inflammation, it will be interesting to investigate the role of leukotrienes on inflammation and other physiological processes.
mesh_terms: D000818:Animals; D001091:Arachidonate Lipoxygenases / Q000037:antagonists & inhibitors*; D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000037:antagonists & inhibitors; D002599:Chalcone / Q000031:analogs & derivatives / Q000494:pharmacology*; D047188:Chalcones; D004305:Dose-Response Relationship, Drug; D004487:Edema / Q000139:chemically induced / Q000517:prevention & control*; D016859:Lipoxygenase Inhibitors; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D010936:Plant Extracts / Q000032:analysis / Q000494:pharmacology*; D011427:Propiophenones / Q000494:pharmacology*; D013189:SRS-A / Q000096:biosynthesis; D013729:Terpenes / Q000494:pharmacology*
chemical_list: D001095:Arachidonic Acids; D047188:Chalcones; D016859:Lipoxygenase Inhibitors; D010936:Plant Extracts; D011427:Propiophenones; D013189:SRS-A; D013729:Terpenes; C056156:3,4,2',4'-tetrahydroxy-2-geranyldihydrochalcone; D016718:Arachidonic Acid; D002599:Chalcone; D001091:Arachidonate Lipoxygenases