# Using Plasma Amyloid Beta Oligomer to Screen in Alzheimer’s Disease: A Pilot Study

## TL;DR

This study explores plasma amyloid-beta oligomers as potential blood markers for early detection of Alzheimer's disease.

## Contribution

The study demonstrates that plasma amyloid-beta oligomers could serve as novel biomarkers for Alzheimer's screening.

## Key findings

- Plasma Aβ1-40 and AβO concentrations were significantly higher in Alzheimer's patients.
- Aβ1-42 levels were lower in Alzheimer's patients compared to controls.
- AβO levels were statistically associated with Aβ1-40 and the Aβ1-42/Aβ1-40 ratio.

## Abstract

Previous studies have shown that plasma amyloid-beta oligomers (AβOs), the toxic form of amyloid-beta (Aβ), are a critical issue in the development or worsening of Alzheimer’s disease (AD) and can be regarded as a blood marker for screening in dementia. We examined plasma AβOs with their related biomarkers in a case–control study to clarify these issues. A total of 16 patients diagnosed with Alzheimer’s dementia (AD) and 16 cognitively normal controls (NCs) were recruited to compare their plasma biomarkers, AβO, Aβ1-40, and Aβ1-42, also referring to other parameters like APOE ε4 status, Clinical Dementia Rating®-Sum of Boxes (CDR®-SB), and Mini Mental Status Examination (MMSE) scores. In plasma concentrations of Aβ1-40, Aβ1-42, and AβO, the mean concentrations were significantly different between the two groups. There is a significant increase in the concentrations of Aβ1-40 and AβO, while Aβ1-42 is decreased in individuals with AD compared to NC. AβO was statistically associated with the Aβ1-40 and Aβ1-42/Aβ1-40 ratio. Higher plasma concentrations of AβO were significantly associated with AD compared to non-dementia controls. This suggests that AβOs can be potential plasma biomarkers to screen in AD. However, a study recruiting more individuals is necessary to examine the association, if any.