Total Aβ₄₂/Aβ₄₀ ratio in plasma predicts amyloid-PET status, independent of clinical AD diagnosis.

ABSTRACT:

Objective

To explore whether the plasma total β-amyloid (Aβ) Aβ₄₂/Aβ₄₀ ratio is a reliable predictor of the amyloid-PET status by exploring the association between these 2 variables in a subset of the Australian Imaging, Biomarkers and Lifestyle (AIBL) study of aging cohort.

Methods

Taking plasma samples at 3 separate time points, month 18 (n = 176), month 36 (n = 169), and month 54 (n = 135), we assessed the total Aβ₄₂/Aβ₄₀ ratio in plasma (TP42/40) with regard to neocortical Aβ burden via PET standardized uptake value ratio (SUVR) and investigated both association with Aβ-PET status and correlation (and agreement) with SUVR.

Results

The TP42/40 plasma ratio was significantly reduced in amyloid-PET-positive participants at

SUBMITTER: Doecke JD 

PROVIDER: S-EPMC7251518 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature