Caffeic acid induces glutathione synthesis through JNK/AP-1-mediated γ-glutamylcysteine ligase catalytic subunit induction in HepG2 and primary hepatocytes

Sung Yong Yang, Jeong Han Kang, Young Seomun, Kwang Won Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Previously our research found that caffeic acid (CA) has antioxidant activity in vitro and in vivo. However, the antioxidant mechanism of CA has not been clearly demonstrated. We investigated the protective mechanism of CA on oxidative stress in HepG2 cells and primary hepatocytes. We focused on the effects of CA on glutathione (GSH) synthesis and its mechanisms. Reporter gene assay, transient transfection, quantitative reverse transcription-polymerase chain reaction and western blot were performed to confirm the mechanisms of antioxidant capacity. CA increased GSH level and γ-glutamylcysteine ligase (γ-GCL) activity. γ-Glutamylcysteine ligase catalytic subunit (GCLC) mRNA and protein levels were significantly increased following treatment with CA, whereas no changes were observed in the γ-GCL modifier subunit levels in HepG2 and rat hepatocytes. CA phosphorylated JNK, and activated the AP-1 transcription factor. These results show that the intracellular GSH levels and GCLC increased through the JNK/AP-1 pathways by CA treatment.

Original languageEnglish
Pages (from-to)1845-1852
Number of pages8
JournalFood Science and Biotechnology
Volume24
Issue number5
DOIs
Publication statusPublished - 2015 Oct 1

Keywords

  • activator protein 1
  • c-Jun N-terminal kinase
  • caffeic acid
  • signaling pathway
  • γ-glutamylcysteine ligase

ASJC Scopus subject areas

  • Food Science
  • Biotechnology
  • Applied Microbiology and Biotechnology

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