Abstract
To counteract oxidative damage in nucleic acids, mammalian cells are equipped with several defense mechanisms. We herein review that MTH1, MUTYH and OGG1 play important roles in mammalian cells avoiding an accumulation of oxidative DNA damage, both in the nuclear and mitochondrial genomes, thereby suppressing carcinogenesis and cell death. MTH1 efficiently hydrolyzes oxidized purine nucleoside triphosphates, such as 8-oxo-dGTP, 8-oxo-dATP and 2-hydroxy (OH)-dATP, to the monophosphates, thus avoiding the incorporation of such oxidized nucleotides into the nuclear and mitochondrial genomes. OGG1 excises 8-oxoG in DNA as a DNA glycosylase and thus minimizes the accumulation of 8-oxoG in the cellular genomes. MUTYH excises adenine opposite 8-oxoG, and thus suppresses 8-oxoG-induced mutagenesis. MUTYH also possesses a 2-OH-A DNA glycosylase activity for excising 2-OH-A incorporated into the cellular genomes. Increased susceptibilities to spontaneous carcinogenesis of the liver, lung or intestine were observed in MTH1-, OGG1- and MUTYH-null mice, respectively. The increased occurrence of lung tumors in OGG1-null mice was abolished by the concomitant disruption of the Mth1 gene, indicating that an increased accumulation of 8-oxoG and/or 2-OH-A might cause cell death. Furthermore, these defense mechanisms also likely play an important role in neuroprotection.
| Original language | English |
|---|---|
| Pages (from-to) | 423-429 |
| Number of pages | 7 |
| Journal | Free Radical Research |
| Volume | 38 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - May 1 2004 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Biochemistry
Cite this
The Defense Mechanisms in Mammalian Cells against Oxidative Damage in Nucleic Acids and their Involvement in the Suppression of Mutagenesis and Cell Death. / Nakabeppu, Yusaku; Tsuchimoto, Daisuke; Furuichi, Masato; Kunihiko, Sakumi.
In: Free Radical Research, Vol. 38, No. 5, 01.05.2004, p. 423-429.Research output: Contribution to journal › Review article
}
TY - JOUR
T1 - The Defense Mechanisms in Mammalian Cells against Oxidative Damage in Nucleic Acids and their Involvement in the Suppression of Mutagenesis and Cell Death
AU - Nakabeppu, Yusaku
AU - Tsuchimoto, Daisuke
AU - Furuichi, Masato
AU - Kunihiko, Sakumi
PY - 2004/5/1
Y1 - 2004/5/1
N2 - To counteract oxidative damage in nucleic acids, mammalian cells are equipped with several defense mechanisms. We herein review that MTH1, MUTYH and OGG1 play important roles in mammalian cells avoiding an accumulation of oxidative DNA damage, both in the nuclear and mitochondrial genomes, thereby suppressing carcinogenesis and cell death. MTH1 efficiently hydrolyzes oxidized purine nucleoside triphosphates, such as 8-oxo-dGTP, 8-oxo-dATP and 2-hydroxy (OH)-dATP, to the monophosphates, thus avoiding the incorporation of such oxidized nucleotides into the nuclear and mitochondrial genomes. OGG1 excises 8-oxoG in DNA as a DNA glycosylase and thus minimizes the accumulation of 8-oxoG in the cellular genomes. MUTYH excises adenine opposite 8-oxoG, and thus suppresses 8-oxoG-induced mutagenesis. MUTYH also possesses a 2-OH-A DNA glycosylase activity for excising 2-OH-A incorporated into the cellular genomes. Increased susceptibilities to spontaneous carcinogenesis of the liver, lung or intestine were observed in MTH1-, OGG1- and MUTYH-null mice, respectively. The increased occurrence of lung tumors in OGG1-null mice was abolished by the concomitant disruption of the Mth1 gene, indicating that an increased accumulation of 8-oxoG and/or 2-OH-A might cause cell death. Furthermore, these defense mechanisms also likely play an important role in neuroprotection.
AB - To counteract oxidative damage in nucleic acids, mammalian cells are equipped with several defense mechanisms. We herein review that MTH1, MUTYH and OGG1 play important roles in mammalian cells avoiding an accumulation of oxidative DNA damage, both in the nuclear and mitochondrial genomes, thereby suppressing carcinogenesis and cell death. MTH1 efficiently hydrolyzes oxidized purine nucleoside triphosphates, such as 8-oxo-dGTP, 8-oxo-dATP and 2-hydroxy (OH)-dATP, to the monophosphates, thus avoiding the incorporation of such oxidized nucleotides into the nuclear and mitochondrial genomes. OGG1 excises 8-oxoG in DNA as a DNA glycosylase and thus minimizes the accumulation of 8-oxoG in the cellular genomes. MUTYH excises adenine opposite 8-oxoG, and thus suppresses 8-oxoG-induced mutagenesis. MUTYH also possesses a 2-OH-A DNA glycosylase activity for excising 2-OH-A incorporated into the cellular genomes. Increased susceptibilities to spontaneous carcinogenesis of the liver, lung or intestine were observed in MTH1-, OGG1- and MUTYH-null mice, respectively. The increased occurrence of lung tumors in OGG1-null mice was abolished by the concomitant disruption of the Mth1 gene, indicating that an increased accumulation of 8-oxoG and/or 2-OH-A might cause cell death. Furthermore, these defense mechanisms also likely play an important role in neuroprotection.
UR - http://www.scopus.com/inward/record.url?scp=2442617250&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=2442617250&partnerID=8YFLogxK
U2 - 10.1080/10715760410001688348
DO - 10.1080/10715760410001688348
M3 - Review article
VL - 38
SP - 423
EP - 429
JO - Free Radical Research
JF - Free Radical Research
SN - 1071-5762
IS - 5
ER -