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Striatal beta-amyloid deposition in Parkinson disease with dementia.

Abstract
Dementia is common in Parkinson disease (PD), although its anatomic and pathologic substrates remain undefined. Recently, striatal abnormalities in Lewy body diseases have been described, but their clinical relevance is not clear. Thirty PD cases from the United Kingdom Parkinson's Disease Society Tissue Bank were grouped as demented (PDD; n = 16) and nondemented (PD; n = 14) based on a review of clinical records. The extent of alpha-synuclein, tau, and amyloid beta peptide (Abeta) deposition in the caudate nucleus, putamen, and nucleus accumbens was assessed. All cases showed severe dopaminergic striatal terminal denervation based on tyrosine hydroxylase immunohistochemistry. Alpha-synuclein and tau deposition in the striatum were rare in both groups, but the Abeta burden was significantly greater in the striatum of PD cases with dementia than present in the nondemented PD group. Striatal Abeta deposition was type-independent of Alzheimer disease changes in the cortex and was minimal in nondemented PD cases. We conclude that Abeta deposition in the striatum strongly correlates with dementia in PD.
AuthorsMichail E Kalaitzakis, Manuel B Graeber, Stephen M Gentleman, Ronald K B Pearce
JournalJournal of neuropathology and experimental neurology (J Neuropathol Exp Neurol) Vol. 67 Issue 2 Pg. 155-61 (Feb 2008) ISSN: 0022-3069 [Print] England
PMID18219254 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
Chemical References
  • Amyloid beta-Peptides
  • alpha-Synuclein
  • tau Proteins
  • Tyrosine 3-Monooxygenase
Topics
  • Adult
  • Aged
  • Aged, 80 and over
  • Amyloid beta-Peptides (metabolism)
  • Corpus Striatum (metabolism)
  • Dementia (complications, pathology)
  • Female
  • Humans
  • Male
  • Middle Aged
  • Parkinson Disease (complications, pathology)
  • Severity of Illness Index
  • Tyrosine 3-Monooxygenase (metabolism)
  • alpha-Synuclein (metabolism)
  • tau Proteins (metabolism)

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