Does Alzheimer’s disease start inside nerve cells?

An experimental study has revealed that the Alzheimer's protein amyloid-beta accumulates inside nerve cells, and that the misfolded protein may then spread from cell to cell via nerve fibers. This happens at an earlier stage than the formation of amyloid-beta plaques in the brain, something that is associated with the progression of Alzheimer's disease.

source https://www.sciencedaily.com/releases/2021/08/210818130550.htm