title: Alteration of colonic absorption by long-chain unsaturated fatty acids. Influence of hydroxylation and degree of unsaturation.
abstract: Unabsorbed dietary unsaturated fatty acids may cause diarrhea in patients with steatorrhea, but their ability to cause colonic fluid secretion is not known. The present study investigated the effect of several dietary long-chain unsaturated fatty acids on colonic absorption and morphology in the rat colon in vivo. The fatty acids tested induced concentration-dependent net water secretion. The ability of these fatty acids to induce net water secretion varied as follows: linolenic acid (18:3) > linoleic acid (18:2), ricinoleic acid (18:1 OH) > oleic acid (18:1), palmitoleic acid (16:1). Net absorption of sodium and chloride were decreased in fatty acid perfusions. Mucosal activity of sodium potassium adenosine triphosphate and adenyl cyclase were not significantly altered by fatty acids. Epithelial cell damage was noted and correlated with the ability of the fatty acid to induce fluid secretion. Unsaturated fatty acids induce epithelial cell damage and fluid secretion in the colon, their effect being related to the degree of unsaturation.
authors.affiliation: Wellcome Trust Research Laboratory, Dept. of Gastrointestinal Sciences, Christian Medical College Hospital, Vellore, India.
authors.forename: B S
authors.initials: BS
authors.lastname: Ramakrishna
authors.forename: M
authors.initials: M
authors.lastname: Mathan
authors.forename: V I
authors.initials: VI
authors.lastname: Mathan
mesh_terms: D000262:Adenylyl Cyclases / Q000378:metabolism; D000818:Animals; D003106:Colon / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D005229:Fatty Acids, Monounsaturated / Q000494:pharmacology; D005231:Fatty Acids, Unsaturated / Q000494:pharmacology*; D006900:Hydroxylation; D066298:In Vitro Techniques; D007408:Intestinal Absorption / Q000187:drug effects*; D007413:Intestinal Mucosa / Q000166:cytology / Q000378:metabolism; D019787:Linoleic Acid; D008041:Linoleic Acids / Q000494:pharmacology; D019301:Oleic Acid; D009829:Oleic Acids / Q000494:pharmacology; D011188:Potassium / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D012277:Ricinoleic Acids / Q000494:pharmacology; D012964:Sodium / Q000378:metabolism; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism; D017962:alpha-Linolenic Acid / Q000494:pharmacology
chemical_list: D005229:Fatty Acids, Monounsaturated; D005231:Fatty Acids, Unsaturated; D008041:Linoleic Acids; D009829:Oleic Acids; D012277:Ricinoleic Acids; D017962:alpha-Linolenic Acid; C008757:palmitoleic acid; D019301:Oleic Acid; D019787:Linoleic Acid; D012964:Sodium; D000262:Adenylyl Cyclases; D000254:Sodium-Potassium-Exchanging ATPase; C030521:ricinoleic acid; D011188:Potassium