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Detection of a mouse OGG1 fragment during caspase-dependent apoptosis: oxidative DNA damage and apoptosis

Takeshi Hirano1, Kazuaki Kawai, Yuko Ootsuyama

  • 1Department of Environmental Oncology, School of Medicine, University of Occupational and Environmental Health, Yahatanishi-ku, Kitakyushu, Fukuoka 807-8555, Japan.

Cancer Science
|August 10, 2004
PubMed

Insights

Mouse 8-oxoguanine DNA glycosylase 1 (mOGG1) fragments during apoptosis, potentially impairing DNA repair. This fragmentation, observed in etoposide-treated cells, suggests a link between DNA repair enzyme function and oxidative DNA damage during apoptosis.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Oxidative DNA damage is implicated in various diseases.
  • DNA repair enzymes play a crucial role in maintaining genomic stability.
  • Caspase-dependent apoptosis is a key cellular process.

Purpose of the Study:

  • To investigate the expression and fragmentation of mouse 8-oxoguanine DNA glycosylase 1 (mOGG1) in hepatocytes during apoptosis.
  • To determine the cellular localization and functional implications of mOGG1 fragmentation.
  • To explore the relationship between mOGG1 fragmentation, oxidative DNA damage, and apoptosis.

Main Methods:

  • Induction of apoptosis in mouse non-parenchymal hepatocytes (NCTC) using etoposide or mitomycin C (MMC).
  • Observation of mOGG1 expression and fragmentation in apoptotic cells.
  • Assessment of caspase dependency for mOGG1 fragmentation.
  • Analysis of mOGG1 fragment localization (cytoplasmic and nuclear).
  • Quantification of 8-hydroxyguanine (8-OH-Gua) accumulation in DNA.

Main Results:

  • mOGG1 fragmentation was observed in apoptotic NCTC.
  • mOGG1 fragmentation was dependent on caspase activity.
  • mOGG1 fragments were found in both the cytoplasm and nucleus of etoposide-treated NCTC.
  • Accumulation of 8-hydroxyguanine (8-OH-Gua) in DNA was observed in etoposide-treated NCTC.
  • The results suggest that fragmented mOGG1 may not function as a normal repair enzyme.

Conclusions:

  • mOGG1 undergoes fragmentation during etoposide- or MMC-induced apoptosis in a caspase-dependent manner.
  • The nuclear localization of mOGG1 fragments indicates potential disruption of DNA repair processes.
  • Accumulation of oxidative DNA damage (8-OH-Gua) alongside mOGG1 fragmentation suggests impaired repair capacity.
  • Further research into DNA repair enzyme fragmentation may elucidate the interplay between oxidative DNA damage and apoptosis.

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