Trans-Fatty acids promote proinflammatory signaling and cell death by stimulating the apoptosis signal-regulating kinase 1 (ASK1)-p38 pathway

Yusuke Hirata, Miki Takahashi, Yuki Kudoh, Kuniyuki Kano, Hiroki Kawana, Kumiko Makide, Yasuharu Shinoda, Yasushi Yabuki, Kohji Fukunaga, Junken Aoki, Takuya Noguchi, Atsushi Matsuzawa

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Food-borne trans-fatty acids (TFAs) are mainly produced as byproducts during food manufacture. Recent epidemiological studies have revealed that TFA consumption is a major risk factor for various disorders, including atherosclerosis. However, the underlying mechanisms in this disease etiology are largely unknown. Here we have shown that TFAs potentiate activation of apoptosis signal-regulating kinase 1 (ASK1) induced by extracellular ATP, a damage-associated molecular pattern leaked from injured cells. Major food-associatedTFAssuch as elaidic acid (EA), linoelaidic acid, and trans-vaccenic acid, but not their corresponding cis isomers, dramatically enhanced extracellular ATP-induced apoptosis, accompanied by elevated activation of the ASK1-p38 pathway in a macrophage-like cell line, RAW264.7. Moreover, knocking out the ASK1-encoding gene abolished EA-mediated enhancementofapoptosis.WehavereportedpreviouslythatextracellularATPinducesapoptosisthroughtheASK1- p38pathwayactivated by reactive oxygen species generated downstream of the P2X purinoceptor 7 (P2X7). However, here we show that EA did not increase ATP-induced reactive oxygen species generation but, rather, augmentedtheeffectsofcalcium/ calmodulin-dependentkinaseII-dependent ASK1 activation. These results demonstrate that TFAs promote extracellular ATP-induced apoptosis by targeting ASK1 and indicate novel TFA-associated pathways leading to inflammatory signal transduction and cell death that underlie the pathogenesis and progression of TFA-induced atherosclerosis. Our study thus provides insight into the pathogenic mechanisms of and proposes potential therapeutic targets for these TFA-related disorders.

Original languageEnglish
Pages (from-to)8174-8185
Number of pages12
JournalJournal of Biological Chemistry
Volume292
Issue number20
DOIs
Publication statusPublished - 2017 May 19

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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