Conversion of t11t13 CLA into c9t11 CLA in Caco-2 cells and inhibition by sterculic oil

• Published in: PloS one Vol. 7; no. 3; p. e32824
• Main Authors: Schneider, Anne-Catherine, Beguin, Pauline, Bourez, Sophie, Perfield, 2nd, James W, Mignolet, Eric, Debier, Cathy, Schneider, Yves-Jacques, Larondelle, Yvan
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 12.03.2012; Public Library of Science (PLoS)
• Subjects: Acids; Adipocytes; Analysis of Variance; Arteriosclerosis; Atherosclerosis; Biology; Caco-2 Cells; Cancer; Cell growth; Chemical properties; Chromatography, Gas; Conversion; Dairy products; Desaturase; Desaturation; Fatty acids; Fatty Acids - analysis; Fish oils; Humans; Inflammatory diseases; Linoleic acid; Linoleic Acids, Conjugated - antagonists & inhibitors; Linoleic Acids, Conjugated - biosynthesis; Lipids; Oil; Plant Oils - pharmacology; Rodents; Rumen; Seeds; Solid Phase Extraction; Stearoyl-CoA Desaturase - antagonists & inhibitors; Stearoyl-CoA Desaturase - metabolism; Sterculia - chemistry; Synthesis; Tissues; Unsaturated fatty acids; Missouri
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0032824

Conjugated linoleic acids (CLA), and principally c9t11 CLA, are suspected to have numerous preventive properties regarding non-infectious pathologies such as inflammatory diseases, atherosclerosis and several types of cancer. C9t11 CLA is produced in the rumen during biohydrogenation of linoleic acid, but can also be synthesized in mammalian tissues from trans-vaccenic acid (C18:1 t11) through the action of delta-9 desaturase (D9D). For several years, it is also known that c9t11 CLA can be synthesized from conjugated linolenic acids (CLnA), i.e. c9t11c13 CLnA and c9t11t13 CLnA. This study aimed at investigating to which extent and by which route c9t11 CLA can be produced from another isomer of CLA, the t11t13 CLA that is structurally very similar to c9t11t13 CLnA, in Caco-2 cells. Caco-2 cells were incubated for 24 h with 20 µmol/l of t11t13 CLA in the absence or presence of sterculic oil used as an inhibitor of D9D. Caco-2 cells were able to convert t11t13 CLA into c9t11 CLA, and c9t11t13 CLnA was formed as an intermediate compound. In the presence of sterculic oil, the production of this intermediate was decreased by 46% and the formation of c9t11 CLA was decreased by 26%. No other metabolite was detected. These results not only highlight the conversion of t11t13 CLA into c9t11 CLA but demonstrate also that this conversion involves first a desaturation step catalysed by D9D to produce c9t11t13 CLnA and then the action of another enzyme reducing the double bond on the Δ13 position.