Relationship between levels of oxidative DNA damage, lipid peroxidation and mitochondrial membrane potential in young and old F344 rats

被引:61
作者
Wong, YT
Ruan, RS
Tay, FEH
机构
[1] Inst Bioengn & Nanotechnol, Canc & Ageing Res Grp, Singapore 138669, Singapore
[2] Inst Bioengn & Nanotechnol, Med Devices Grp, Singapore 138669, Singapore
[3] Natl Univ Singapore, Dept Mech Engn, Singapore 117548, Singapore
[4] Natl Univ Singapore, Dept Otolaryngol, Singapore 117548, Singapore
关键词
8OHdG; 8-iso-PGF(2 alpha); mitochondrial membrane potential; oxidative damage; ageing;
D O I
10.1080/10715760600556074
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The extent of in vivo oxidative damage has been known to be cumulative over the period of the life of mammals. Our hypothesis is that there should be a positive correlation between the levels of 8-hydroxy-20-deoxyguanosine (8OHdG) and 8-iso-prostaglandin F-2 alpha (8-iso-PGF(2 alpha)) in major rat tissues. We also investigated whether increased level of oxidative stress causes a decrease in the mitochondrial membrane potential of peripheral lymphocytes of old rats using the MitoTracker Red fluorochrome. Our results show positive correlations between 8OHdG and 8-iso-PGF(2 alpha) for liver, brain and kidney measured by HPLC-UV-ECD (electrochemical detector) and EIA methods, respectively. However, heart tissues show a negative correlation. The mitochondrial membrane potential of old rat lymphocytes records significant decrease compared with the young lymphocytes. Based on our results, we conclude that in ageing studies, specific tissues need to be examined in order to measure the localised DNA damage and lipid peroxidation as different tissues display different extent of oxidative damage. We believe this approach of using combined markers is useful to verify the true efficacy of health intervention studies in animals and humans. In addition, the isoprostane assay can be further developed looking at lipid peroxidation as a potential marker in ageing studies.
引用
收藏
页码:393 / 402
页数:10
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