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Aβ Beyond the AD Pathology: Exploring the Structural Response of Membranes Exposed to Nascent Aβ Peptide
Valeria Rondelli1, Mario Salmona2, Laura Colombo2
1Department Medical Biotechnologies and Translational Medicine, Università of Milano, Via F.lli Cervi, 93, 20090 Segrate (MI), Italy.
Abstract:
The physiological and pathological roles of nascent amyloid beta (Aβ) monomers are still debated in the literature. Their involvement in the pathological route of Alzheimer's Disease (AD) is currently considered to be the most relevant, triggered by their aggregation into structured oligomers, a toxic species. Recently, it has been suggested that nascent Aβ, out of the amyloidogenic pathway, plays a physiological and protective role, especially in the brain. In this emerging perspective, the study presented in this paper investigated whether the organization of model membranes is affected by contact with Aβ in the nascent state, as monomers. The outcome is that, notably, the rules of engagement and the resulting structural outcome are dictated by the composition and properties of the membrane, rather than by the Aβ variant. Interestingly, Aβ monomers are observed to favor the tightening of adjacent complex membranes, thereby affecting a basic structural event for cell-cell adhesion and cell motility.
Insights
Nascent amyloid beta (Aβ) monomers interact with cell membranes, influencing cell adhesion and motility. Membrane properties, not Aβ type, dictate these interactions, suggesting a potential physiological role beyond Alzheimer's Disease pathology.
Area of Science:
- Biochemistry
- Cell Biology
- Neuroscience
Background:
- The physiological and pathological roles of nascent amyloid beta (Aβ) monomers are debated.
- Aβ aggregation into oligomers is linked to Alzheimer's Disease (AD) pathology.
- Emerging evidence suggests nascent Aβ may have physiological, protective functions, particularly in the brain.
Purpose of the Study:
- To investigate how nascent Aβ monomers affect model membrane organization.
- To determine if Aβ monomers influence membrane structure and properties.
Main Methods:
- Utilized model membranes with varying compositions and properties.
- Studied the interaction of nascent Aβ monomers with these model membranes.
Main Results:
- Membrane composition and properties, rather than Aβ variant, govern interactions.
- Aβ monomers were observed to tighten adjacent complex membranes.
- This tightening impacts fundamental structural events like cell-cell adhesion and motility.
Conclusions:
- Nascent Aβ monomers can modulate membrane organization.
- These interactions are dependent on membrane characteristics.
- Aβ monomers may play a physiological role in cell adhesion and motility, independent of amyloidogenic pathways.
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