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Oxidation of mitochondrial peroxiredoxin 3 during the initiation of receptor-mediated apoptosis

Andrew G Cox1, Juliet M Pullar, Gillian Hughes

  • 1Free Radical Research Group, Department of Pathology, University of Otago, Christchurch, New Zealand.

Free Radical Biology & Medicine
|January 1, 2008
PubMed

Insights

Fas-mediated apoptosis selectively oxidizes mitochondrial peroxiredoxin 3, indicating early redox disruption. This early event suggests a role for peroxiredoxin 3 oxidation in regulating cell death progression.

Area of Science:

  • Cellular Biology
  • Biochemistry
  • Oxidative Stress

Background:

  • Cell death, or apoptosis, is crucial for development and disease.
  • Redox homeostasis, maintained by systems like thioredoxin, is vital for cell survival.
  • Death receptor activation is known to impact cellular redox balance.

Purpose of the Study:

  • To investigate the role of redox homeostasis disruption in Fas-mediated apoptosis.
  • To monitor the redox status of peroxiredoxins during apoptosis induction.
  • To determine if peroxiredoxin oxidation is an early event in apoptosis.

Main Methods:

  • Monitoring peroxiredoxin redox status in Jurkat T lymphoma cells during Fas-mediated apoptosis.
  • Utilizing techniques to detect oxidized peroxiredoxin 3.
  • Comparing the timing of peroxiredoxin 3 oxidation with other apoptotic markers.

Main Results:

  • Selective oxidation of mitochondrial peroxiredoxin 3 was observed as an early event in Fas-mediated apoptosis.
  • Peroxiredoxin 3 was captured as a disulfide, suggesting thioredoxin system impairment.
  • This oxidation preceded major apoptotic events like mitochondrial permeability transition and phosphatidylserine exposure.

Conclusions:

  • Early selective oxidation of peroxiredoxin 3 disrupts mitochondrial redox homeostasis.
  • Impaired thioredoxin system function contributes to peroxiredoxin 3 oxidation during apoptosis.
  • Peroxiredoxin 3 oxidation may play a role in the progression of apoptosis.

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