Differential Modulating Effect of MoS₂ on Amyloid Peptide Assemblies.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Neuroscience

Background:

• Amyloid diseases are linked to abnormal amyloid fibril formation.
• Modulating amyloid assembly is crucial for understanding disease pathogenesis.
• Two-dimensional nanomaterials like graphene oxide and tungsten disulfide show promise in modulating amyloid fibrillogenesis.

Purpose of the Study:

• To investigate the modulation effect of molybdenum disulfide (MoS2) on the self-assembly of amyloid peptides.
• To explore the distinct interactions between MoS2 and different amyloid peptides.

Main Methods:

• Label-free techniques including quartz crystal microbalance (QCM), atomic force microscopy (AFM), and circular dichroism (CD) spectroscopy were employed.
• The study focused on amyloid-beta peptide (33-42) [Aβ(33-42)] and amylin (20-29).

Main Results:

• Molybdenum disulfide (MoS2) demonstrated varying modulation effects on the assembly of Aβ(33-42) and amylin (20-29).
• These differential effects are attributed to distinct binding affinities between the amyloid peptides and MoS2.
• This marks the first report of MoS2 acting as a modulator for amyloid aggregation.

Conclusions:

• MoS2 is a novel nanomaterial modulator for amyloid fibrillogenesis.
• Understanding MoS2's interaction with amyloid peptides sheds light on disease mechanisms.
• This research expands the biological applications of MoS2 and enriches the field of 2D nanomodulators.