Conjugated linoleic acid, cis-9,trans-11, is a substrate for pulmonary 15-lipoxygenase-1 in rat

Hyejung Cho, Daniel D. Gallaher, A. Saari Csallany

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6 Scopus citations


The objective of this study was to determine whether two of the major conjugated linoleic acid (CLA) isomers, cis-9,trans-11 (c9,t11) and trans-10,cis-12 (t10,c12), are possible substrates for pulmonary 15-lipoxygenase-1 (15-LOX-1) and, therefore, they are also involved in the production of 13(S)-hydroxyoctadecadienoic acid [13(S)-HODE] in biological systems. 13(S)-HODE, a major bioactive metabolite of linoleic acid, is an important intracellular signal agent and is involved in cell proliferation and differentiation in various biological systems. Nordihydroguaiaretic acid (NDGA), a known LOX inhibitor, was used as a control for measuring 15-LOX-1 enzyme activity. It was found that c9,t11-CLA was 25% as active as linoleic acid as a substrate for 15-LOX-1; however, t10,c12-CLA was not a substrate for 15-LOX-1 as measured by 13(S)-HODE production. The authenticity of the production of 13(S)-HODE from c9,t11 as a substrate was established by isolation and cochromatography with pure standard on HPLC using non-radioactive and [ 14C]-c9,t11-CLA.

Original languageEnglish (US)
Pages (from-to)7262-7266
Number of pages5
JournalJournal of agricultural and food chemistry
Issue number18
StatePublished - Sep 7 2005


  • 13-hydroxyoctadecadienoic acid
  • Carcinogenesis
  • Conjugated linoleic acid
  • Lipoxygenase
  • Lung
  • Rat


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