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Regulation of singlet oxygen-induced apoptosis by cytosolic NADP+-dependent isocitrate dehydrogenase

Sun Yee Kim1, Su Min Lee, Jean Kyoung Tak

  • 1School of Life Sciences and Biotechnology, College of Natural Sciences, Kyungpook National University, Taegu, 702-701, Korea.

Molecular and Cellular Biochemistry
|July 25, 2007
PubMed

Insights

Cytosolic NADP(+)-dependent isocitrate dehydrogenase (IDPc) protects against singlet oxygen-induced cell death. Increased IDPc levels reduce susceptibility to apoptosis, highlighting its protective role in oxidative stress.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Oxidative Stress Research

Background:

  • Singlet oxygen (¹O₂) is a reactive oxygen species causing cellular damage.
  • Cytosolic NADP(+)-dependent isocitrate dehydrogenase (IDPc) regulates redox balance and antioxidant defense via NADPH supply.
  • Previous work established IDPc's role in antioxidant systems.

Purpose of the Study:

  • To investigate the role of IDPc in regulating apoptosis induced by singlet oxygen.
  • To determine if IDPc activity modulates cellular susceptibility to singlet oxygen-induced cell death.

Main Methods:

  • Utilized HL-60 cells for experiments.
  • Transfected HL-60 cells with mouse IDPc cDNA in sense and antisense orientations.
  • Assessed the relationship between IDPc expression levels and apoptosis induction by singlet oxygen.

Main Results:

  • Modulation of IDPc activity in HL-60 cells directly impacts singlet oxygen-induced apoptosis.
  • A significant inverse relationship was observed: higher IDPc expression correlated with lower susceptibility to apoptosis.
  • IDPc demonstrates a protective effect against singlet oxygen-induced cell death.

Conclusions:

  • IDPc plays a crucial protective role in mitigating singlet oxygen-induced apoptosis in HL-60 cells.
  • IDPc's function in maintaining redox balance is key to cellular defense against oxidative damage.
  • Targeting IDPc activity may offer a strategy to combat singlet oxygen-related cellular injury.

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