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• W2147029479 abstract "DNA methylation is important for controlling the profile of gene expression and is catalyzed by DNA methyltransferase (MTase), an enzyme that is abundant in brain. Because significant DNA damage and alterations in gene expression develop as a consequence of cerebral ischemia, we measured MTase activity in vitro and DNA methylation in vivo after mild focal brain ischemia. After 30 min middle cerebral artery occlusion (MCAo) and reperfusion, MTase catalytic activity and the 190 kDa band on immunoblot did not change over time. However, [ 3 H]methyl-group incorporation into DNA increased significantly in wild-type mice after reperfusion, but not in mutant mice heterozygous for a DNA methyltransferase gene deletion ( Dnmt S/+ ). Dnmt S/+ mice were resistant to mild ischemic damage, suggesting that increased DNA methylation is associated with augmented brain injury after MCA occlusion. Consistent with this formulation, treatment with the MTase inhibitor 5-aza-2′-deoxycytidine and the deacetylation inhibitor trichostatin A conferred stroke protection in wild-type mice. In contrast to mild stroke, however, DNA methylation was not enhanced, and reduced dnmt gene expression was not protective in an ischemia model of excitotoxic/necrotic cell death. In conclusion, our results demonstrate that MTase activity contributes to poor tissue outcome after mild ischemic brain injury." @default.
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• W2147029479 date "2000-05-01" @default.
• W2147029479 modified "2023-10-14" @default.
• W2147029479 title "DNA Methyltransferase Contributes to Delayed Ischemic Brain Injury" @default.
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• W2147029479 doi "https://doi.org/10.1523/jneurosci.20-09-03175.2000" @default.
• W2147029479 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6773114" @default.
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