Conical nanopores highlight the pro-aggregating effects of pyrimethanil fungicide on Aβ(1-42) peptides and dimeric splitting phenomena.
Fiche publication
Date publication
mars 2022
Journal
Chemosphere
Auteurs
Membres identifiés du Cancéropôle Est :
Dr PICAUD Fabien
Tous les auteurs :
Meyer N, Arroyo N, Baldelli M, Coquart N, Janot JM, Perrier V, Chinappi M, Picaud F, Torrent J, Balme S
Lien Pubmed
Résumé
The Aβ(1-42) aggregation is a key event in the physiopathology of Alzheimer's disease (AD). Exogenous factors such as environmental pollutants, and more particularly pesticides, can corrupt Aβ(1-42) assembly and could influence the occurrence and pathophysiology of AD. However, pesticide involvement in the early stages of Aβ(1-42) aggregation is still unknown. Here, we employed conical track-etched nanopore in order to analyse the Aβ(1-42) fibril formation in the presence of pyrimethanil, a widely used fungicide belonging to the anilinopyrimidine class. Our results evidenced a pro-aggregating effect of pyrimethanil on Aβ(1-42). Aβ(1-42) assemblies were successfully detected using conical nanopore coated with PEG. Using an analytical model, the large current blockades observed (>0.7) were assigned to species with size close to the sensing pore. The long dwell times (hundreds ms scale) were interpreted by the possible interactions amyloid/PEG using molecular dynamic simulation. Such interaction could leave until splitting phenomena of the dimer structure. Our work also evidences that the pyrimethanil induce an aggregation of Aβ(1-42) mechanism in two steps including the reorganization prior the elongation phase.
Mots clés
Amyloid, Aβ(1–42), Fungicide, Lag phase, Nanopore, Resistive pulse, Track-etched
Référence
Chemosphere. 2022 Mar;291(Pt 1):132733