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• W2144406304 abstract "Cardiac failure is associated with increased levels of oxidized DNA, especially mitochondrial (mtDNA). It is not known if oxidized mtDNA contributes to cardiac dysfunction. To test if protection of mtDNA can reduce cardiac injury, we produced transgenic mice with cardiomyocyte-specific overexpression of the DNA repair enzyme 8-oxoguanine DNA glycosylase 1 (OGG1) isoform 2a. In one line of mice, the transgene increased OGG1 activity by 115% in mitochondria and by 28% in nuclei. OGG1 transgenic mice demonstrated significantly lower cardiac mitochondrial levels of the DNA guanine oxidation product 7,8-dihydro-8-oxoguanine (8-oxo-dG) under basal conditions, after doxorubicin administration, or after transaortic constriction (TAC), but the transgene produced no detectable reduction in nuclear 8-oxo-dG content. OGG1 mice were tested for protection from the cardiac effects of TAC 13 wk after surgery. Compared with FVB-TAC mice, hearts from OGG1-TAC mice had lower levels of β-myosin heavy chain mRNA but they did not display significant differences in the ratio of heart weight to tibia length or protection of cardiac function measured by echocardiography. The principle benefit of OGG1 overexpression was a significant decrease in TAC-induced cardiac fibrosis. This protection was indicated by reduced Sirius red staining on OGG1 cardiac sections and by significantly decreased induction of collagen 1 and 3 mRNA expression in OGG1 hearts after TAC surgery. These results provide a new model to assess the damaging cardiac effects of 8-oxo-dG formation and suggest that increased repair of 8-oxo-dG in mtDNA decreases cardiac pathology." @default.
• W2144406304 created "2016-06-24" @default.
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• W2144406304 date "2011-11-01" @default.
• W2144406304 modified "2023-10-17" @default.
• W2144406304 title "Cardiac overexpression of 8-oxoguanine DNA glycosylase 1 protects mitochondrial DNA and reduces cardiac fibrosis following transaortic constriction" @default.
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• W2144406304 doi "https://doi.org/10.1152/ajpheart.00157.2011" @default.
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