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EBP1 potentiates amyloid β pathology by regulating γ-secretase
Byeong-Seong Kim1,2, Inwoo Hwang1,2, Hyo Rim Ko1,2
1Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, Korea.
Nature Aging
|January 8, 2025
Summary
ErbB3 binding protein 1 (EBP1) inhibits amyloid-beta (Aβ) production in Alzheimer's disease (AD). Cleavage of EBP1 accelerates Aβ deposition and cognitive decline, suggesting EBP1 preservation as a potential AD therapy.
Area of Science:
- Neuroscience
- Molecular Biology
- Pathology
Background:
- Alzheimer's disease (AD) is characterized by amyloid-beta (Aβ) plaque deposition.
- Amyloid precursor protein (APP) cleavage by γ-secretase produces Aβ.
- Presenilin is the catalytic subunit of γ-secretase.
Purpose of the Study:
- To investigate the role of ErbB3 binding protein 1 (EBP1)/proliferation-associated 2G4 (PA2G4) in Aβ production and AD neuropathology.
- To explore EBP1 as a potential therapeutic target for AD.
Main Methods:
- Interaction studies between EBP1 and presenilin.
- Analysis of Ebp1/Pa2g4 knockout mouse models.
- Assessment of Aβ deposition, amyloid plaques, and cognitive function in mice.
- Investigation of EBP1 cleavage in postmortem human AD brains and 5x-FAD mice.
- Viral vector-mediated delivery of EBP1 in 5x-FAD mice.
Main Results:
- EBP1 interacts with presenilin and inhibits Aβ production.
- Mice lacking forebrain Ebp1/Pa2g4 exhibit AD-like phenotypes, including increased Aβ deposition and cognitive deficits.
- EBP1 is proteolytically cleaved in AD brains, impairing its inhibitory function.
- Restoring functional EBP1 in 5x-FAD mice reduced Aβ generation and improved behavior.
Conclusions:
- EBP1 functions as a crucial inhibitor of γ-secretase-mediated APP cleavage.
- EBP1 cleavage contributes to AD pathogenesis.
- Preserving functional EBP1 represents a promising therapeutic strategy for Alzheimer's disease.
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