Alzheimer’s Disease-Associated Neurotoxic Peptide Amyloid-B Impairs Base Excision Repair in Human Neuroblastoma Cells

International Journal of Molecular Sciences

Anne Forestier²  Thierry Douki²  Sylvie Sauvaigo²  Viviana De Rosa²  Christine Demeilliers¹ 

[1] INSERM U1055, Joseph Fourier University-Grenoble 1, 38000 Grenoble, France; E-Mail:;Nucleic Acids Lesions Laboratory, SCIB/INAC, CEA, Joseph Fourier University-Grenoble 1, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France; E-Mails:

关键词: neurodegenerative disorders;    Alzheimer’s disease;    DNA damage;    DNA repair;    8oxoGuanine;    OGG1;    Base Excision Repair;    oxidative stress;   

DOI  :  10.3390/ijms131114766

来源: mdpi

【 摘 要 】

Alzheimer’s disease (AD) is the leading cause of dementia in developed countries. It is characterized by two major pathological hallmarks, one of which is the extracellular aggregation of the neurotoxic peptide amyloid-β (Aβ), which is known to generate oxidative stress. In this study, we showed that the presence of Aβ in a neuroblastoma cell line led to an increase in both nuclear and mitochondrial DNA damage. Unexpectedly, a concomitant decrease in basal level of base excision repair, a major route for repairing oxidative DNA damage, was observed at the levels of both gene expression and protein activity. Moreover, the addition of copper sulfate or hydrogen peroxide, used to mimic the oxidative stress observed in AD-affected brains, potentiates Aβ-mediated perturbation of DNA damage/repair systems in the “Aβ cell line”. Taken together, these findings indicate that Aβ could act as double-edged sword by both increasing oxidative nuclear/mitochondrial damage and preventing its repair. The synergistic effects of increased ROS production, accumulated DNA damage and impaired DNA repair could participate in, and partly explain, the massive loss of neurons observed in Alzheimer’s disease since both oxidative stress and DNA damage can trigger apoptosis.

【 授权许可】

CC BY   
© 2012 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.