Changes in lipid membranes may trigger amyloid toxicity in Alzheimer's disease

TL;DR

This study investigates how alterations in lipid membrane composition during aging and Alzheimer's disease influence amyloid beta interactions, proposing that membrane changes may trigger toxicity through electrostatic mechanisms, opening new therapeutic avenues.

Contribution

The paper introduces multi-component lipid models mimicking healthy and diseased neuronal membranes and demonstrates their differing interactions with amyloid beta using advanced microscopy techniques.

Findings

Membrane models differ in nanoscale structure and physical properties.

Altered membranes interact differently with amyloid beta.

Electrostatic mechanisms may trigger amyloid toxicity due to membrane changes.

Abstract

Amyloid beta peptides (A\b{eta}), implicated in Alzheimers disease (AD), interact with the cellular membrane and induce amyloid toxicity. The composition of cellular membranes changes in aging and AD. We designed multi component lipid models to mimic healthy and diseased states of the neuronal membrane. Using atomic force microscopy (AFM), Kelvin probe force microscopy (KPFM) and black lipid membrane (BLM) techniques, we demonstrated that these model membranes differ in their nanoscale structure and physical properties, and interact differently with A\b{eta}. Based on our data, we propose a new hypothesis that changes in lipid membrane due to aging and AD may trigger amyloid toxicity through electrostatic mechanisms, similar to the accepted mechanism of antimicrobial peptide action. Understanding the role of the membrane changes as a key activating amyloid toxicity may aid in the development of a new avenue for the prevention and treatment of AD.