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Nrf2 protects mitochondrial decay by oxidative stress

Joshua Strom1, Beibei Xu1, Xiuqing Tian1

  • 1Department of Pharmacology, College of Medicine, University of Arizona, Tucson, Arizona, USA.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|September 6, 2015
PubMed

Insights

Oxidative stress damages mitochondria, but nuclear factor-erythroid-derived 2-related factor 2 (Nrf2) protects them. Nrf2 overexpression prevents mitochondrial damage and dysfunction, suggesting direct mitochondrial interaction.

Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Oxidative Stress Research

Background:

  • Sublethal oxidative stress is linked to various diseases.
  • Cardiomyocytes, rich in mitochondria, are ideal for studying mitochondrial responses to stress.
  • Nuclear factor-erythroid-derived 2-related factor 2 (Nrf2) is a key regulator of cellular defense mechanisms.

Purpose of the Study:

  • To investigate the impact of sublethal oxidative stress on cardiomyocyte mitochondria.
  • To determine if Nrf2 can reverse oxidative stress-induced mitochondrial damage.
  • To elucidate the mechanism by which Nrf2 interacts with mitochondria.

Main Methods:

  • Exposure of cardiomyocytes to sublethal hydrogen peroxide (H2O2) doses.
  • Morphological analysis using electron microscopy.
  • Assessment of mitochondrial function and protein/mRNA levels.
  • Overexpression and knockout studies of Nrf2.

Main Results:

  • H2O2 exposure caused mitochondrial fragmentation, swelling, cristae disorganization, and decreased function.
  • Mitochondrial component reduction (cytochrome c, cytochrome b) was observed post-H2O2.
  • Nrf2 overexpression prevented H2O2-induced mitochondrial morphological changes and cytochrome reduction.
  • Nrf2 did not significantly reduce protein oxidation but associated with the outer mitochondrial membrane.

Conclusions:

  • Nrf2 plays a protective role against oxidative stress-induced mitochondrial injury in cardiomyocytes.
  • Nrf2's protective mechanism likely involves direct interaction with mitochondria.
  • Mitochondria from Nrf2 knockout mice exhibit increased sensitivity to permeability transition, supporting Nrf2's role.
Keywords:
cell survivalloss of mitochondriamitochondrial outer membranetranscription factor

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