Induction of the human oxidized base-specific DNA glycosylase NEIL1 by reactive oxygen species

Aditi Das, Tapas K. Hazra, Istvan Boldogh, Sankar Mitra, Kishor K. Bhakat

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

NEIL1, a mammalian DNA glycosylase and ortholog of Escherichia coli Nei/Fpg, is involved in the repair of oxidatively damaged bases in mammalian cells. Exposure of HCT116 human colon carcinoma cells to reactive oxygen species, generated by glucose oxidase (GO), enhanced the levels of NEIL1 mRNA and polypeptide by 2-4-fold by 6 h after GO treatment. A similar oxidative stress-induced increase in human NEIL1 (hNEIL1) promoter-dependent luciferase expression in HCT116 cells indicates that reactive oxygen species activates NEIL1 transcription. The transcriptional start site of hNEIL1 was mapped, and the upstream promoter sequence was characterized via luciferase reporter assay. Two identical CRE/AP-1-binding sites were identified in the promoter that binds transcription factors c-Jun and CREB/ATF2. This binding was significantly enhanced in extracts of cells treated with GO. Furthermore, a simultaneous increase in the level of phosphorylated c-Jun suggests its involvement in up-regulating the NEIL1 promoter. Oxidative stress-induced activation of NEIL1 appears to be involved in the feedback regulation of cellular repair activity needed to handle an increase in the level of oxidative base damage.

Original languageEnglish (US)
Pages (from-to)35272-35280
Number of pages9
JournalJournal of Biological Chemistry
Volume280
Issue number42
DOIs
StatePublished - Oct 21 2005

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DNA Glycosylases
Glucose Oxidase
Reactive Oxygen Species
Oxidative stress
Luciferases
Oxidative Stress
Repair
Cells
HCT116 Cells
Transcription Factor AP-1
Transcription
Cell Extracts
Escherichia coli
Assays
Colon
Transcription Factors
Chemical activation
Binding Sites
Carcinoma
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ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Induction of the human oxidized base-specific DNA glycosylase NEIL1 by reactive oxygen species. / Das, Aditi; Hazra, Tapas K.; Boldogh, Istvan; Mitra, Sankar; Bhakat, Kishor K.

In: Journal of Biological Chemistry, Vol. 280, No. 42, 21.10.2005, p. 35272-35280.

Research output: Contribution to journalArticle

Das, Aditi ; Hazra, Tapas K. ; Boldogh, Istvan ; Mitra, Sankar ; Bhakat, Kishor K. / Induction of the human oxidized base-specific DNA glycosylase NEIL1 by reactive oxygen species. In: Journal of Biological Chemistry. 2005 ; Vol. 280, No. 42. pp. 35272-35280.
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