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- Title
Population variation in oxidative stress and astrocyte DNA damage in relation to Alzheimer-type pathology in the ageing brain.
- Authors
Simpson, J. E.; Ince, P. G.; Haynes, L. J.; Theaker, R.; Gelsthorpe, C.; Baxter, L.; Forster, G.; Lace, G. L.; Shaw, P. J.; Matthews, F. E.; Savva, G. M.; Brayne, C.; Wharton, S. B.
- Abstract
J. E. Simpson, P. G. Ince, L. J. Haynes, R. Theaker, C. Gelsthorpe, L. Baxter, G. Forster, G. L. Lace, P. J. Shaw, F. E. Matthews, G. M. Savva, C. Brayne and S. B. Wharton (2010) Neuropathology and Applied Neurobiology 36, 25–40 Population variation in oxidative stress and astrocyte DNA damage in relation to alzheimer-type pathology in the ageing brain Aims: Increasing evidence suggests a role for oxidative damage to DNA in brain ageing and in neurodegenerative disorders, including Alzheimer's disease. Most studies have focussed on the reduced capacity for DNA repair by neurones, and have not taken into account the effect of oxidative stress on astrocytes, and their contribution to pathology. Methods: We examined levels of oxidative stress, DNA damage and DNA repair mechanisms in astrocytes in a population-based sample derived from the Medical Research Council Cognitive Function and Ageing Neuropathology Study. Results: We demonstrate wide variation in parameters for oxidative stress and DNA damage in astrocytes in the ageing population. We show that there is a significant reduction ( P = 0.002) in the lipid peroxidation marker malondialdehyde with increasing Braak stage in Alzheimer's disease. Furthermore, we demonstrate that expression of the DNA damage-associated molecules H2AX and DNA-dependent protein kinase do not increase with increasing Braak stage, rather there is evidence of a nonsignificant reduction in DNA-dependent protein kinase expression by neurones and astrocytes, and in H2AX by neurones with increasing levels of Alzheimer's type pathology. Conclusions: These findings suggest that the changes in oxidative stress and the astrocyte DNA damage response are not accounted for as an accumulating effect due to established Alzheimer-type pathology. We hypothesize that astrocyte damage, leading to impaired function, may contribute to the development of ageing brain pathology in some individuals.
- Subjects
BIOCHEMICAL genetics; ALZHEIMER'S disease; BRAIN; AGING; PROTEIN kinases; NEUROLOGICAL disorders
- Publication
Neuropathology & Applied Neurobiology, 2010, Vol 36, Issue 1, p25
- ISSN
0305-1846
- Publication type
Article
- DOI
10.1111/j.1365-2990.2009.01030.x