VEGF controls microglial phagocytic response to amyloid-β

Area of Science:

• Neuroscience
• Immunology
• Molecular Biology

Background:

• Microglial cells are crucial in Alzheimer's disease (AD) pathogenesis due to impaired amyloid-beta (Aβ) clearance.
• Amyloid-beta oligomers (Aβo) are the most neurotoxic forms, causing synaptic damage.
• Vascular Endothelial Growth Factor (VEGF) has shown potential in counteracting Aβo effects and promoting microglial migration.

Purpose of the Study:

• To investigate the influence of VEGF on microglial phagocytic response to Aβ.
• To elucidate the molecular mechanisms underlying VEGF's effect on microglial Aβ clearance.

Main Methods:

• Utilized in vitro and ex vivo models of amyloid accumulation.
• Assessed microglial phagocytosis of Aβ oligomers.
• Investigated the role of α-secretase activity and TREM2 cleavage in microglial cells.

Main Results:

• VEGF significantly increases the phagocytosis of Aβ oligomers by microglial cells.
• VEGF modulates α-secretase activity, leading to enhanced cleavage of TREM2 (Triggering Receptor Expressed on Myeloid cells 2).
• Soluble TREM2 (sTREM2) also promotes microglial phagocytosis of Aβ oligomers.

Conclusions:

• VEGF acts as a novel regulator of Aβ clearance by enhancing microglial phagocytosis.
• The findings suggest VEGF's potential therapeutic role in restoring impaired microglial function in Alzheimer's disease.