CPNE7 Regulates Amyloidogenesis Through CAP1-Dependent ADAM10 Translation

Area of Science:

• Neuroscience
• Molecular Biology
• Biochemistry

Background:

• Amyloid plaque accumulation is a hallmark of Alzheimer's disease (AD).
• ADAM10, an α-secretase, plays a crucial role in the non-amyloidogenic pathway by processing APP.
• The function of copine-7 (CPNE7) in AD pathogenesis is largely unknown.

Purpose of the Study:

• To investigate the role of CPNE7 in Alzheimer's disease.
• To elucidate the mechanism by which CPNE7 influences amyloid-beta (Aβ) production.
• To identify downstream targets of CPNE7 involved in AD pathology.

Main Methods:

• Quantification of CPNE7 protein levels in AD mouse models (APP/PS1) and cell cultures.
• Assessment of Aβ levels and ADAM10 activity in response to CPNE7 modulation.
• Transcriptome profiling to identify CPNE7-regulated genes.
• Investigation of the interaction between CPNE7, CAP1, and ADAM10 regulation.

Main Results:

• CPNE7 protein levels are significantly decreased in APP/PS1 mice and APP-expressing cells.
• CPNE7 reduces Aβ levels by enhancing ADAM10 activity through a translational mechanism.
• CPNE7 upregulates cyclase-associated actin cytoskeleton regulatory protein 1 (CAP1) expression.
• CAP1 regulates ADAM10 translation by binding to its 5' untranslated region (5'UTR).

Conclusions:

• The CPNE7-CAP1 axis is critical in regulating ADAM10 translation and the amyloidogenic pathway in AD.
• CPNE7's neuroprotective effect is mediated by promoting non-amyloidogenic processing via ADAM10.
• CAP1's RNA-binding activity is highlighted as a key component in this regulatory pathway, offering potential therapeutic targets for AD.