Impact of Less Common and “Disregarded” Neurodegenerative Pathologies on Dementia Burden in a Population-Based Cohort

Article type: Research Article

Authors: Keage, Hannah A.D.^{a; *} | Ince, Paul G.^b | Matthews, Fiona E.^c | Wharton, Stephen B.^b | McKeith, Ian G.^d | Brayne, Carol^e | on behalf of MRC CFAS and CC75C

Affiliations: [a] Cognitive Neuroscience Laboratory, School of Psychology, Social Work and Social Policy, University of South Australia, SA, Australia | [b] Sheffield Institute for Translational Neuroscience, University of Sheffield, Sheffield, UK | [c] Medical Research Council Biostatistics Unit, Cambridge, Newcastle, UK | [d] Institute for Ageing and Health, Newcastle University, Newcastle, UK | [e] Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK

Correspondence: [*] Correspondence to: Hannah A.D. Keage, Ph.D., School of Psychology, Social Work and Social Policy, University of South Australia, GPO Box 2471, Adelaide SA 5001, Australia. Tel.: +61 8 8302 4262; Fax: +61 8 8302 4377; E-mail: Hannah.Keage@unisa.edu.au.

Abstract: Epidemiological studies investigating the pathological bases of late onset dementia focus on classical markers such as plaques and tangles. The significance of pathologies characteristically associated with rare dementia syndromes such as Pick bodies and severe neuronal loss are considered to be well defined. The significance of other pathologies, often accepted as a feature of neurodegenerative syndromes, such as Hirano bodies and gliosis is not clear. This study investigated the significance of these rarer and ‘disregarded’ pathologies to dementia in the population. A total of 627 individuals aged 71–103 from the Epidemiological CLInicoPathologial Studies in Europe (EClipSE) project with clinical dementia status at death determined were assessed. Pathologies assessed included Pick bodies, severe neuronal loss, gliosis, and granulovacuolar degeneration (GVD) in the cortex and/or hippocampus, along with brainstem plaques, tangles, neuronal loss, gliosis, pigmentary incontinence, and Lewy bodies. All pathologies were associated with dementia when controlling for plaques and tangles except Hirano bodies, GVD, and brainstem plaques. These included hippocampal and entorhinal gliosis; cortical, hippocampal, and entorhinal neuronal loss; along with brainstem neuronal loss, gliosis, pigmentary incontinence, Lewy bodies, and tangles. Pick bodies were present in five individuals, all with clinical dementia. These epidemiological data indicate that dementia in old age is associated with a broad range of pathological and anatomical substrates pointing to potential areas for future research, particularly the brainstem.

Keywords: Age, aging, brain, dementia, pathology

DOI: 10.3233/JAD-2011-111268

Journal: Journal of Alzheimer's Disease, vol. 28, no. 2, pp. 485-493, 2012