Abstract:
AIMS:Population-based studies have shown that approximately 20% of the ageing population (aged 65 years and over) with dementia have little or no classical Alzheimer-type neuropathology. Cumulative DNA damage and a reduced capacity of DNA repair may result in neuronal dysfunction and contribute to cognitive impairment independent of Alzheimer-type pathology in the ageing brain. METHODS:We investigated expression of the DNA damage response (DDR)-associated molecules γH2AX and DNA-PKcs using immunohistochemistry and western blotting, and senescence-associated β-galactosidase in the frontal association neocortex of cases with low levels of Alzheimer-type pathology (Braak & Braak stage 0-II), and explored their relationship to cognitive impairment in a population-representative sample from the Medical Research Council's Cognitive Function and Ageing Study cohort. RESULTS:Increases in both γH2AX(+) (r(s) = -0.36, P = 0.025) and DNA-PKcs(+) (r(s) = -0.39, P = 0.01) neuronal counts were associated with a lower Mini-Mental State Examination score. Increasing levels of senescence associated-β-gal(+) pyramidal neurones were weakly associated with the total number of DNA-PKcs(+) neurones (P = 0.08), but not with traditional senescence-associated signalling molecules, including p53 and p16. CONCLUSION:The association between the neuronal DDR and cognitive impairment, independent of AD pathology in the ageing brain, may be suggestive of a causal link via neuronal dysfunction.
journal_name
Neuropathol Appl Neurobioljournal_title
Neuropathology and applied neurobiologyauthors
Simpson JE,Ince PG,Matthews FE,Shaw PJ,Heath PR,Brayne C,Garwood C,Higginbottom A,Wharton SB,MRC Cognitive Function and Ageing Neuropathology Study Group.doi
10.1111/nan.12202subject
Has Abstractpub_date
2015-06-01 00:00:00pages
483-96issue
4eissn
0305-1846issn
1365-2990journal_volume
41pub_type
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