title: Conversion of t11t13 CLA into c9t11 CLA in Caco-2 cells and inhibition by sterculic oil.
abstract: BACKGROUND
  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.
  
  
  RESULTS
  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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Institut des Sciences de la Vie, Université Catholique de Louvain, Louvain-la-Neuve, Belgium.
authors.forename: Anne-Catherine
authors.initials: AC
authors.lastname: Schneider
authors.forename: Pauline
authors.initials: P
authors.lastname: Beguin
authors.forename: Sophie
authors.initials: S
authors.lastname: Bourez
authors.forename: James W
authors.initials: JW
authors.lastname: Perfield
authors.forename: Eric
authors.initials: E
authors.lastname: Mignolet
authors.forename: Cathy
authors.initials: C
authors.lastname: Debier
authors.forename: Yves-Jacques
authors.initials: YJ
authors.lastname: Schneider
authors.forename: Yvan
authors.initials: Y
authors.lastname: Larondelle
mesh_terms: D000704:Analysis of Variance; D018938:Caco-2 Cells; D002849:Chromatography, Gas; D005227:Fatty Acids / Q000032:analysis; D006801:Humans; D044243:Linoleic Acids, Conjugated / Q000037:antagonists & inhibitors* / Q000096:biosynthesis*; D010938:Plant Oils / Q000494:pharmacology*; D052616:Solid Phase Extraction; D013230:Stearoyl-CoA Desaturase / Q000037:antagonists & inhibitors / Q000378:metabolism; D032361:Sterculia / Q000737:chemistry
chemical_list: D005227:Fatty Acids; D044243:Linoleic Acids, Conjugated; D010938:Plant Oils; C046938:9,11-linoleic acid; D013230:Stearoyl-CoA Desaturase