Plasma amyloid-β oligomers level is a biomarker for Alzheimer's disease diagnosis

L. Zhou, K. H. Chan, L. W. Chu, J. S.C. Kwan, Y. Q. Song, L. H. Chen, P. W.L. Ho, O. Y. Cheng, J. W.M. Ho, K. S.L. Lam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

44 Citations (Scopus)


Amyloid beta (Aβ), especially Aβ oligomers, is important in Alzheimer's disease (AD) pathogenesis. We studied plasma Aβ 40, Aβ 42, and Aβ oligomers levels in 44 AD patients and 22 non-demented controls. Cognitive functions were assessed by Chinese version of mini-mental state examination (MMSE), Abbreviated Metal Test (AMT), Alzheimer's Disease Assessment Scale Cognitive Subscale (ADAS-cog). Plasma Aβ monomers and oligomers levels were measured by ELISA. We found that the median plasma Aβ 40 and Aβ 42 levels were similar between AD and controls, and without significant correlation with cognition. Plasma Aβ oligomers level was higher in AD than controls (642.54ng/ml [range 103.33-2676.93] versus 444.18ng/ml [range 150.19-1311.18], p=0.047), and negatively correlated with cognition. In multivariate logistic regression analysis, the highest tertile of Aβ oligomers levels showed an increased risk of AD than the combined group of middle and lowest tertiles (OR=8.85, p=0.013), after adjustment of gender, age and APOE4 genotype. Increased plasma Aβ oligomers level was associated with decreased MMSE and AMT scores (p=0.037, p=0.043, respectively) and increased ADAS-cog score (p=0.036), suggesting negative correlation with cognitive function. We concluded that plasma Aβ oligomers level is an useful biomarker for AD diagnosis.

Original languageEnglish
Pages (from-to)697-702
Number of pages6
JournalBiochemical and Biophysical Research Communications
Issue number4
Publication statusPublished - 13 Jul 2012
Externally publishedYes


  • Alzheimer's disease
  • Amyloid-beta oligomers
  • Biomarker
  • Cognitive functions
  • Plasma amyloid-beta oligomers level

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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