C-Terminal Fragments of Amyloid-β Peptide Cause Cholinergic Axonal Degeneration by a Toxic Effect Rather Than by Physical Injury in the Nondemented Human Brain

Previous experimental studies have indicated that amyloid-b peptide (Aβ) may cause axonal degeneration in the brain of individuals with Alzheimer's disease (AD) by physical injury, mass lesion, or membrane perturbation. In this study, acetylcholinesterase histochemical, and Aβ and tau immunohistochemical double-staining were performed in nondemented elderly human hippocampal and entorhinal brain samples, to demonstrate the presence of dystrophic neurites caused by the C-terminal or N-terminal fragments of Aβ. The early interactions between the Aβ-stained senile plaques (SPs) and the enzyme-positive axons were investigated. The double-stained samples revealed that Aβ deposition occurs first, followed by the development of cholinergic axonal damage. Most of the dystrophic axonal processes are incorporated in the peripheral area of the SPs and are positive for phosphorylated tau [pS202] and tau-5. The result suggests that C-terminal fragments are more harmful than N-terminal fragments of Aβ and may induce the development of dystrophic neurites by a toxic effect rather than by physical injury.