Jacaric acid, a linolenic acid isomer with a conjugated triene system, reduces stearoyl-CoA desaturase expression in liver of mice

Nahoko Shinohara, Junya Ito, Tsuyoshi Tsuduki, Taro Honma, Ryo Kijima, Soko Sugawara, Tatsuya Arai, Masao Yamasaki, Aya Ikezaki, Marino Yokoyama, Kazuo Nishiyama, Kiyotaka Nakagawa, Teruo Miyazawa, Ikuo Ikeda

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Conjugated fatty acid is a collective term used for fatty acids with conjugated double bond systems. Seed oils from certain plants include conjugated linolenic acids, which have a conjugated triene system and are geometrical and positional isomers of α-linolenic acid. One of these isomers, jacaric acid (JA, 8c, 10t, 12c-18:3), has not been examined widely. Therefore, we investigated the absorption and metabolism of JA in normal animals (ICR mice). An oral dose of JA of 5 mg/day for 1 week had no effects on body weight, food intake and tissue weight of mice. JA was detected in the serum, kidney, liver, lung and epididymal white adipose tissue. Analysis of the fatty acid composition in liver and white adipose tissue showed a tendency to increase levels of saturated fatty acids (SFAs) such as palmitic acid (16:0) and stearic acid (18:0) and to decrease levels of monounsaturated fatty acids (MUFAs) such as palmitoleic acid (16:1) and oleic acid (18:1). Thus, JA treatment decreased the desaturation index (16:1/16:0, 18:1/18:0) in liver and white adipose tissue. This index is used as an indicator of the activity of stearoyl coenzyme A desaturase (SCD), an endoplasmic reticulum enzyme that catalyzes the biosynthesis of MUFAs from SFAs. The change in this index indicates that JA inhibited SCD activity in ICR mice, and further experiments showed that JA also decreased the expression level of SCD-1 mRNA. Inhibition of SCD activity may have anti-obesity and anti-diabetes effects, and therefore the findings in this study suggest that JA may be effective for preventing obesity and diabetes.

Original languageEnglish
Pages (from-to)433-441
Number of pages9
JournalJournal of oleo science
Volume61
Issue number8
DOIs
Publication statusPublished - 2012 Nov 19

Keywords

  • Conjugated fatty acid
  • Conjugated linolenic acid
  • Jacaranda seed oil
  • Jacaric acid
  • Stearoyl coenzyme A desaturase

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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