Elevation of plasma soluble amyloid precursor protein beta in Alzheimer's disease

Sang Moon Yun, Sun Jung Cho, Chulman Jo, Moon Ho Park, Changsu Han, Young Ho Koh

Research output: Contribution to journalArticle

Abstract

Introduction: Beta-amyloid is considered to be a pathophysiological marker in Alzheimer's disease (AD). Soluble amyloid precursor proteins (sAPPs) –α (sAPPα) and –β (sAPPβ), which are the byproducts of non-amyloidogenic and amyloidogenic process of APP, respectively, have been repeatedly observed in the cerebrospinal fluids (CSF) of AD patients. The present study focused on the determination of sAPP levels in peripheral blood. Methods: The plasma protein levels of sAPPα and sAPPβ were measured with ELISA. Plasma from 52 AD patients, 98 amnestic mild cognitive impairment (MCI) patients, and 114 cognitively normal controls were compared. Results: The plasma level of sAPPβ was significantly increased in AD patients than in cognitively healthy controls. However, no significant change in plasma sAPPα was observed among the three groups. Furthermore, the plasma sAPPβ levels significantly correlated with cognitive assessment scales, such as clinical dementia rating (CDR), and mini-mental status examination (MMSE). Interestingly, sAPPα and sAPPβ had a positive correlation with each other in blood plasma, similar to previous studies on CSF sAPP. This correlation was stronger in the MCI and AD groups than in the cognitively healthy controls. Conclusions: These results suggest that individuals with elevated plasma sAPPβ levels are at an increased risk of AD; elevation in these levels may reflect the progression of disease.

Original languageEnglish
Article number103995
JournalArchives of Gerontology and Geriatrics
Volume87
DOIs
Publication statusPublished - 2020 Mar 1

Keywords

  • Alzheimer's disease (AD)
  • Cognitive impairment
  • Plasma biomarker
  • Soluble amyloid precursor proteins alpha (sAPPα)
  • Soluble amyloid precursor proteins beta (sAPPβ)

ASJC Scopus subject areas

  • Health(social science)
  • Ageing
  • Gerontology
  • Geriatrics and Gerontology

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