A modern hypothesis

The distinct pathologies of dementia associated with Parkinson's disease versus Alzheimer's disease

Martin Farlow, Jeffrey Cummings

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Background/Aims: Parkinson's disease dementia (PDD) is common, but its neuropathological basis has been controversial. The aim of this review was to survey the recent literature on the pathology of PDD and compare the pathology of PDD to that of Alzheimer's disease (AD). Methods: A literature search was performed to identify relevant research published since 2001. Results: There is widespread Lewy body pathology in the neocortex and subcortical regions in PDD, and Lewy neurites in the CA2 region of the hippocampus that correlate with cognitive decline. Genetic forms of PD, which frequently lead to dementia, are associated with deposition of α-synuclein; PDD is not related to the apolipoprotein E ε4 genotype. Compared with AD, central cholinergic deficits occur earlier, are greater and more widespread in PDD, but PDD can occur without the abundant senile plaques and neurofibrillary tangles indicative of AD. Conclusion:Epidemiological investigations, neuroimaging, as well as genetic and neuropathological studies increasingly support PDD as distinct from AD.

Original languageEnglish
Pages (from-to)301-308
Number of pages8
JournalDementia and Geriatric Cognitive Disorders
Volume25
Issue number4
DOIs
StatePublished - Apr 2008

Fingerprint

Parkinson Disease
Dementia
Alzheimer Disease
Pathology
Synucleins
Apolipoprotein E4
Lewy Bodies
Neurofibrillary Tangles
Neocortex
Amyloid Plaques
Neurites
Neuroimaging
Cholinergic Agents
Hippocampus
Genotype
Research

Keywords

  • Alzheimer's disease
  • Lewy bodies
  • Neuropathology
  • Parkinson's disease

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Geriatrics and Gerontology

Cite this

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abstract = "Background/Aims: Parkinson's disease dementia (PDD) is common, but its neuropathological basis has been controversial. The aim of this review was to survey the recent literature on the pathology of PDD and compare the pathology of PDD to that of Alzheimer's disease (AD). Methods: A literature search was performed to identify relevant research published since 2001. Results: There is widespread Lewy body pathology in the neocortex and subcortical regions in PDD, and Lewy neurites in the CA2 region of the hippocampus that correlate with cognitive decline. Genetic forms of PD, which frequently lead to dementia, are associated with deposition of α-synuclein; PDD is not related to the apolipoprotein E ε4 genotype. Compared with AD, central cholinergic deficits occur earlier, are greater and more widespread in PDD, but PDD can occur without the abundant senile plaques and neurofibrillary tangles indicative of AD. Conclusion:Epidemiological investigations, neuroimaging, as well as genetic and neuropathological studies increasingly support PDD as distinct from AD.",
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