Base excision DNA repair levels in mitochondrial lysates of Alzheimer's disease.

Base excision DNA repair levels in mitochondrial lysates of Alzheimer's disease.
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阿尔茨海默氏病线粒体裂解物的碱基切除DNA修复水平。

DOI:
10.1016/j.neurobiolaging.2014.01.004
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发表时间:
2014-06
影响因子:
4.2
通讯作者:
Bohr VA
Bohr VA
中科院分区:
医学2区
文献类型:
--
作者:
Canugovi C;Shamanna RA;Croteau DL;Bohr VA

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阿尔茨海默病 (AD) 是一种老年痴呆症,在老年受试者(年龄>65 岁)中发病率较高。 AD 最早的标志之一是 DNA 氧化损伤。最近有报道称,临床前 AD 患者大脑的核和线粒体核酸氧化损伤水平升高。此外,在对照组和 AD 死后大脑中,线粒体 DNA 中的不同氧化损伤比核 DNA 中的氧化损伤高 5-10 倍。我们之前表明,相对于匹配的对照受试者,AD 和轻度认知障碍受试者的整个组织提取物中的碱基切除修复 (BER) 成分显着丢失。然而,目前还无法对 AD 患者大脑线粒体提取物中碱基切除修复水平的具体步骤进行全面分析。在这项研究中,我们主要研究了 AD 线粒体提取物和匹配对照死后大脑样本中 BER 的各种成分。我们发现 AD 大脑中的 5-羟基尿嘧啶 (5OHU) 切口和连接酶活性显着较低,而尿嘧啶切口、脱碱基位点裂解和 dNTP 掺入活性在这些样本中正常。
Alzheimer’s disease (AD) is a senile dementia with increased incidence in older subjects (age>65 years). One of the earliest markers of AD is oxidative DNA damage. Recently it has been reported that preclinical AD patient brains show elevated levels of oxidative damage in both nuclear and mitochondrial nucleic acids. Moreover, different oxidative lesions in mitochondrial DNA are between 5–10-fold higher than in nuclear DNA in both control and AD postmortem brains. We previously showed that there is a significant loss of base excision repair (BER) components in whole tissue extracts of AD and mild cognitive impairment subjects relative to matched control subjects. However, comprehensive analysis of specific steps in base excision repair levels in mitochondrial extracts of AD patient brains is not available. In this study we mainly investigated various components of BER in mitochondrial extracts of AD and matched control postmortem brain samples. We found that the 5-hydroxyuracil (5OHU) incision and ligase activities are significantly lower in AD brains whereas the uracil incision, abasic site cleavage and dNTP incorporation activities are normal in these samples.
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