Amyloid-β Oligomers Regulate ADAM10 Synaptic Localization Through Aberrant Plasticity Phenomena

Area of Science:

• Neuroscience
• Molecular Biology
• Biochemistry

Background:

• A disintegrin and metalloproteinase 10 (ADAM10) is a synaptic enzyme regulating amyloid-β (Aβ) peptide formation in Alzheimer's disease (AD).
• ADAM10 activity is modulated by synaptic plasticity, with long-term depression (LTD) promoting its synaptic localization and long-term potentiation (LTP) causing its internalization.
• ADAM10 plays a role in spine shaping via cleavage of adhesion molecules.

Purpose of the Study:

• To investigate the effect of amyloid-β oligomers on ADAM10 synaptic localization and internalization.
• To elucidate the mechanism by which Aβ oligomers influence ADAM10 trafficking at the synapse.
• To understand the interplay between Aβ oligomers, synaptic plasticity, and ADAM10 function in AD pathogenesis.

Main Methods:

• In vitro exposure of hippocampal neuronal cultures to Aβ oligomers.
• Analysis of ADAM10 synaptic localization and endocytosis.
• Investigation of the role of neuronal activity and NMDA receptor activation.

Main Results:

• Aβ oligomers induced increased ADAM10 synaptic localization, similar to LTD, but through impaired endocytosis, not enhanced delivery.
• Aβ oligomers inhibited ADAM10 internalization in a manner dependent on neuronal activity and NMDA receptor activation.
• These findings suggest Aβ oligomers trigger an aberrant synaptic plasticity mechanism.

Conclusions:

• Aβ oligomers can downregulate Aβ generation by modulating ADAM10 synaptic availability via impaired internalization.
• Altered ADAM10 activity may impact structural plasticity, contributing to AD pathogenesis.
• This study reveals a complex relationship between synaptic activity and core AD mechanisms involving ADAM10.