کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10738805 1046834 2005 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
No evidence of mitochondrial respiratory dysfunction in OGG1-null mice deficient in removal of 8-oxodeoxyguanine from mitochondrial DNA
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی سالمندی
پیش نمایش صفحه اول مقاله
No evidence of mitochondrial respiratory dysfunction in OGG1-null mice deficient in removal of 8-oxodeoxyguanine from mitochondrial DNA
چکیده انگلیسی
Accumulation of high levels of mutagenic oxidative mitochondrial DNA (mtDNA) lesions like 8-oxodeoxyguanine (8-oxodG) is thought to be involved in the development of mitochondrial dysfunction in aging and in disorders associated with aging. Mice null for oxoguanine DNA glycosylase (OGG1) are deficient in 8-oxodG removal and accumulate 8-oxodG in mtDNA to levels 20-fold higher than in wild-type mice (N.C. Souza-Pinto et al., 2001, Cancer Res. 61, 5378-5381). We have used these animals to investigate the effects on mitochondrial function of accumulating this particular oxidative base modification. Despite the presence of high levels of 8-oxodG, mitochondria isolated from livers and hearts of Ogg1−/− mice were functionally normal. No differences were detected in maximal (chemically uncoupled) respiration rates, ADP phosphorylating respiration rates, or nonphosphorylating rates with glutamate/malate or with succinate/rotenone. Similarly, maximal activities of respiratory complexes I and IV from liver and heart were not different between wild-type and Ogg1−/− mice. In addition, there was no indication of increased oxidative stress in mitochondria from Ogg1−/− mice, as measured by mitochondrial protein carbonyl content. We conclude, therefore, that highly elevated levels of 8-oxodG in mtDNA do not cause mitochondrial respiratory dysfunction in mice.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Free Radical Biology and Medicine - Volume 38, Issue 6, 15 March 2005, Pages 737-745
نویسندگان
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