Nuclear factor E2-related factor 2-dependent myocardiac cytoprotection against oxidative and electrophilic stress

Hong Zhu, Zhenquan Jia, Bhaba R. Misra, Li Zhang, Zhuoxiao Cao, Masayuki Yamamoto, Michael A. Trush, Hara P. Misra, Yunbo Li

Research output: Contribution to journalArticle

Abstract

Nuclear factor E2-related factor 2 (Nrf2) is a critical regulator of cytoprotective gene expression. However, the role of this transcription factor in myocardiac cytoprotection against oxidative and electrophilic stress remains unknown. This study was undertaken to investigate if Nrf2 signaling could control the constitutive and inducible expression of antioxidants and phase 2 enzymes in primary cardiomyocytes as well as the susceptibility of these cells to oxidative and electrophilic injury. The basal expression of a series of antioxidants and phase 2 enzymes was significantly lower in cardiomyocytes from Nrf2-/- mice than those from wild-type littermates. Incubation of wild-type cardiomyocytes with 3H-1,2-dithiole-3-thione (D3T) led to significant induction of various antioxidants and phase 2 enzymes, including catalase, glutathione, glutathione peroxidase (GPx), glutathione reductase, glutathione S-transferase, NAD(P)H:quinone oxidoreductase 1, and heme oxygenase-1. The inducibility of the above cellular defenses except GPx by D3T was abolished in Nrf2-/- cardiomyocytes. As compared to wild-type cells, Nrf2 -/- cardiomyocytes were much more susceptible to cell injury induced by H2O2, peroxynitrite, and 4-hydroxy-2-nonenal. Treatment of wild-type cardiomyocytes with D3T, which upregulated the cellular defenses, resulted in increased resistance to the above oxidant- and electrophile-induced cell injury, whereas D3T treatment of Nrf2-/- cardiomyocytes provided no cytoprotection. This study demonstrates that Nrf2 is an important factor in controlling both constitutive and inducible expression of a wide spectrum of antioxidants and phase 2 enzymes in cardiomyocytes and is responsible for protecting these cells against oxidative and electrophilic stress. These findings also implicate Nrf2 as an important signaling molecule for myocardiac cytoprotection.

Original languageEnglish (US)
Pages (from-to)71-85
Number of pages15
JournalCardiovascular Toxicology
Volume8
Issue number2
DOIs
StatePublished - Jun 1 2008

Keywords

  • Antioxidants
  • Cardiomyocytes
  • Electrophilic stress
  • Nrf2
  • Oxidative stress
  • Phase 2 enzymes

ASJC Scopus subject areas

  • Molecular Biology
  • Toxicology
  • Cardiology and Cardiovascular Medicine

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  • Cite this

    Zhu, H., Jia, Z., Misra, B. R., Zhang, L., Cao, Z., Yamamoto, M., Trush, M. A., Misra, H. P., & Li, Y. (2008). Nuclear factor E2-related factor 2-dependent myocardiac cytoprotection against oxidative and electrophilic stress. Cardiovascular Toxicology, 8(2), 71-85. https://doi.org/10.1007/s12012-008-9016-0