Presenter of 1 Presentation
U-P53AZ-PTMS AS FINGERPRINTS TO DETECT ALZHEIMER’S DISEASE AND OTHER DEMENTIA.
Abstract
Aims
Recently, the p53 protein has gained attention for its role in the early evolution of Alzheimer’s disease (AD). p53 is regulated by post translational modifications (PTMs) which affect its conformation and function in several processes in AD. We have investigated the PTMs occurring in U-p53AZ in patients suffering by different forms of dementia and at different stage of cognitive decline to show the specificity of U-p53AZ in AD.
Methods
U-p53AZ isolated from 48 patients (55 plasma samples) from AIBL biobank (70y av.) was analysed by AlzoSure®Confirm method to detect its PTMs. U-p53AZ captured by 2D3A8Ab from plasma samples fwas sequenced by mass spectrometry technology (Orbitrap XL). The study cohort included 16AD, 9 Cognitive Normal (CN), 6 Mild Cognitive Impaired (MCI), 7 asymptomatic AD, 8 prodromal AD, 6 Frontotemporal Dementia (FTD), 1 Vascular Dementia and 1 Lewy Body Dementia patients.
Results
11 U-p53AZ-PTMs of (acetylation, phosphorylation and ubiquitination in different aa-residues) were identified in total and each clinical group showed the same combination of PTMs: all AD patients showed the same PTMs pattern plus the truncation of the protein in the N-terminus region, whilst FTD showed only 3 PTMs and any truncation. Interestingly, asymptomatic and prodromal AD individuals showed a distinct PTMs pattern than CN and MCI.
Conclusions
U-p53AZ undergoes to different biochemical pathways impacting on its linear sequence specifically linked to dementia pathogenesis. U-p53AZ-PTMs detected by AlzoSure® Confirm represents a simple, non-invasive tool to discriminate AD from other dementia and to identify the stage of cognitive decline.