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American Journal of Pathology, Vol 145, 1472-1484, Copyright © 1994 by American Society for Investigative Pathology

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Influence of apolipoprotein E genotype on senile dementia of the Alzheimer and Lewy body types. Significance for etiological theories of Alzheimer's disease

CR Harrington, J Louwagie, R Rossau, E Vanmechelen, RH Perry, EK Perry, JH Xuereb, M Roth and CM Wischik
Cambridge Brain Bank Laboratory, University of Cambridge Department of Psychiatry, United Kingdom.

Alzheimer's disease (AD) is associated with an increased frequency of the apolipoprotein E type epsilon 4 allele. To address both the disease and the allele specificity of this association, we have examined the apolipoprotein E allele distribution in 255 elderly persons including those with autopsy-confirmed AD, senile dementia of the Lewy body type (SDLT), vascular dementia, Parkinson's disease (PD) or Huntington's disease and in nondemented controls either with or without coronary complications. The epsilon 4 allele frequency was increased in SDLT (0.365) and AD (0.328) as compared with controls (0.147), PD (0.098), or Huntington's chorea (0.171). Coronary disease and vascular dementia were associated with marginally higher epsilon 4 allele frequencies than in controls. In PD, amyloid beta-protein accumulated to a greater extent in those cases possessing an epsilon 4 allele than in those without. Those PD cases with dementia were not distinguished from either controls or PD cases without dementia, whether tested biochemically or by apolipoprotein E genotype. It is the comparison of the results in AD and SDLT that yielded the most significant findings. There was a 1.8-fold excess of amyloid beta-protein in AD as compared with controls, and the levels in SDLT were intermediate between those in AD and controls. In contrast, AD was discriminated from both controls and SDLT by the substantial accumulation of paired helical filament tau and phosphorylated tau (both increased more than 20-fold as compared with controls). SDLT was nevertheless characterized by an increased epsilon 4 allele frequency in the absence of significant tau pathology (at least 10-fold less than that in AD). These findings indicate that tau processing is more specifically associated with AD than is amyloid beta-protein accumulation and that presence of the epsilon 4 allele is not an etiological factor that accounts for tau pathology.

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