Spontaneous Formation of β-sheet Nano-barrels during the Early Aggregation of Alzheimer's Amyloid Beta.
Yunxiang Sun, Aleksandr Kakinen, Xulin Wan, Niamh Moriarty, Cameron PJ Hunt, Yuhuan Li, Nicholas Andrikopoulos, Aparna Nandakumar, Thomas P Davis, Clare L Parish, Yang Song, Pu Chun Ke, Feng Ding
Nano Today | Published : 2021
Soluble low-molecular-weight oligomers formed during the early aggregation of amyloid peptides have been hypothesized as a major toxic species of amyloidogenesis. Herein, we performed the first synergic in silico, in vitro and in vivo validations of the structure, dynamics and toxicity of Aβ42 oligomers. Aβ peptides readily assembled into β-rich oligomers comprised of extended β-hairpins and β-strands. Nanosized β-barrels were observed with certainty with simulations, transmission electron microscopy and Fourier transform infrared spectroscopy, corroborated by immunohistochemistry, cell viability, apoptosis, inflammation, autophagy and animal behavior assays. Secondary and tertiary structura..View full abstract