title: The role of calcium in eicosanoid production induced by ricinoleic acid or the calcium ionophore A23187.
abstract: Rat isolated intestine incubated in Krebs solution converted exogenous [14C]-arachidonic acid into products that chromatographed with prostaglandins, leukotriene B4 and 5-hydroxy-eicosatetraenoic acid. Accumulation of these products was increased by the laxative ricinoleic acid (0.34 mM) or the calcium ionophore A23187 (7.6 microM). In the presence of the calcium antagonists TMB-8 (0.43 microM) or verapamil (0.2 microM) the mean effects of ricinoleic acid or the calcium ionophore were smaller. Stimulation of arachidonic acid metabolism by ricinoleic acid therefore seems likely to involve a calcium-dependent mechanism.
mesh_terms: D000818:Animals; D001095:Arachidonic Acids / Q000378:metabolism*; D000001:Calcimycin / Q000494:pharmacology*; D002118:Calcium / Q000502:physiology*; D003106:Colon / Q000187:drug effects / Q000378:metabolism*; D005231:Fatty Acids, Unsaturated / Q000494:pharmacology*; D005707:Gallic Acid / Q000031:analogs & derivatives / Q000494:pharmacology; D006893:Hydroxyeicosatetraenoic Acids / Q000096:biosynthesis; D066298:In Vitro Techniques; D007975:Leukotriene B4 / Q000096:biosynthesis; D008297:Male; D011453:Prostaglandins / Q000096:biosynthesis; D051381:Rats; D012277:Ricinoleic Acids / Q000494:pharmacology*; D014700:Verapamil / Q000494:pharmacology
chemical_list: D001095:Arachidonic Acids; D005231:Fatty Acids, Unsaturated; D006893:Hydroxyeicosatetraenoic Acids; D011453:Prostaglandins; D012277:Ricinoleic Acids; D007975:Leukotriene B4; D000001:Calcimycin; C022022:5-hydroxy-6,8,11,14-eicosatetraenoic acid; C006014:8-(N,N-diethylamino)octyl-3,4,5-trimethoxybenzoate; D005707:Gallic Acid; D014700:Verapamil; C030521:ricinoleic acid; D002118:Calcium