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Int. J. Mol. Sci. 2012, 13(11), 14766-14787; doi:10.3390/ijms131114766
Article

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

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Received: 14 August 2012; in revised form: 18 September 2012 / Accepted: 8 October 2012 / Published: 13 November 2012
(This article belongs to the Special Issue DNA Damage and Repair in Degenerative Diseases)
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Abstract: 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.
Keywords: neurodegenerative disorders; Alzheimer’s disease; DNA damage; DNA repair; 8oxoGuanine; OGG1; Base Excision Repair; oxidative stress neurodegenerative disorders; Alzheimer’s disease; DNA damage; DNA repair; 8oxoGuanine; OGG1; Base Excision Repair; oxidative stress
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Forestier, A.; Douki, T.; Sauvaigo, S.; De Rosa, V.; Demeilliers, C.; Rachidi, W. Alzheimer’s Disease-Associated Neurotoxic Peptide Amyloid-Β Impairs Base Excision Repair in Human Neuroblastoma Cells. Int. J. Mol. Sci. 2012, 13, 14766-14787.

AMA Style

Forestier A, Douki T, Sauvaigo S, De Rosa V, Demeilliers C, Rachidi W. Alzheimer’s Disease-Associated Neurotoxic Peptide Amyloid-Β Impairs Base Excision Repair in Human Neuroblastoma Cells. International Journal of Molecular Sciences. 2012; 13(11):14766-14787.

Chicago/Turabian Style

Forestier, Anne; Douki, Thierry; Sauvaigo, Sylvie; De Rosa, Viviana; Demeilliers, Christine; Rachidi, Walid. 2012. "Alzheimer’s Disease-Associated Neurotoxic Peptide Amyloid-Β Impairs Base Excision Repair in Human Neuroblastoma Cells." Int. J. Mol. Sci. 13, no. 11: 14766-14787.



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