Age-associated decrease of oxidative repair enzymes, human 8-oxoguanine DNA glycosylases (hOgg1), in human aging

Shin Kuang Chen, Wanhua Annie Hsieh, Mong Hsun Tsai, Chien Chih Chen, Antonio Ic Hong, Yau Huei Wei, Wushou P. Chang

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)


8-Oxoguanine has been shown to be a dominant cause of oxidative DNA damage by oxygen free radicals in eukaryotic cells. The 8-oxoguanine repair-specific enzyme 8-oxoguanine-DNA glycosylase (hOgg1) was recently cloned and was observed to conduct mainly short-patch base-excision repair. It has also been suggested that reactive oxygen species play an important role in the cellular aging process. We explored the association between the hOgg1 enzyme activity in somatic cells of human subjects of various ages and the role of hOgg1 326 genetic polymorphism. An 8-oxoguanine-containing 28 mer oligonucleotide was end-labeled with γ-32P ATP and incubated with protein extracts from peripheral blood lymphocytes (PBL) from 78 healthy individuals ranging in age from newborn to 91 years old. The hOgg1 repair activity toward the radiolabelled 8-oxoguanine-containing DNA was determined, and the results indicated a significant age-dependent decrease in the hOgg1 activity in their lymphocytes. Significantly reduced activity was also shown in those with Cysteine/Cysteine genotypes. The genders of the subjects were not shown to be associated. These results provide an important observation regarding the cellular hOgg1 activity in somatic cells during the normal human aging processes.

Original languageEnglish
Pages (from-to)31-35
Number of pages5
JournalJournal of Radiation Research
Issue number1
Publication statusPublished - Mar 2003
Externally publishedYes


  • 8-Oxoguanine
  • Aging
  • Glycosylase
  • Ogg1
  • Polymorphism

ASJC Scopus subject areas

  • General Medicine


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