Amyloid-β Precursor Protein APP Down-Regulation Alters Actin Cytoskeleton-Interacting Proteins in Endothelial Cells

Area of Science:

• Endothelial cell biology
• Molecular mechanisms of vascular function
• Neurodegenerative disease research

Background:

• The amyloid-β precursor protein (APP) is linked to Alzheimer's disease (AD) and cerebral amyloid angiopathy (CAA).
• While APP's role in neurons is studied, its function in endothelial cells and vasculature remains unclear.
• Understanding endothelial APP is crucial for vascular health and neurodegenerative disease prevention.

Purpose of the Study:

• To investigate the role and molecular targets of APP in endothelial cells.
• To elucidate how APP influences endothelial cell behavior and signaling pathways.
• To determine the impact of APP down-regulation on endothelial function.

Main Methods:

• Molecular and proteomic approaches were used to identify APP targets.
• Cellular assays assessed proliferation, migration, and adhesion.
• Analysis of focal adhesion stability and cell-cell junctions was performed.
• VEGF-A stimulation and Scr/FAK pathway modulation were investigated.

Main Results:

• APP is essential for endothelial cell proliferation, migration, and adhesion.
• Loss of APP disrupts focal adhesion stability and cell-cell junctions.
• APP mediates endothelial response to VEGF-A growth factor.
• APP modulates the Scr/FAK signaling pathway to propagate stimuli and cellular responses.

Conclusions:

• Intact APP expression and processing are required for normal endothelial function.
• APP plays a critical vasoprotective role in endothelial cells.
• These findings may inform clinical strategies for preserving vasculature in AD and CAA patients.