Α-synuclein induces microglial cell migration through stimulating HIF-1α accumulation

Area of Science:

• Neuroscience
• Immunology
• Cell Biology

Background:

• Microglial cell migration is crucial in spinal cord injury following aortic surgery.
• Alpha-synuclein, released by injured neurons, activates microglial cells.

Purpose of the Study:

• To investigate the impact of alpha-synuclein on microglial cell migration.
• To elucidate the underlying molecular mechanisms involving HIF-1α and toll-like receptors.

Main Methods:

• Primary rat microglial cells were treated with varying doses of alpha-synuclein oligomers.
• Hypoxia-inducible factor 1-alpha (HIF-1α) and toll-like receptor (TLR) expression were analyzed.
• Cell migration assays, siRNA transfections, and overexpression vectors were employed.

Main Results:

• Alpha-synuclein dose-dependently increased HIF-1α accumulation in microglial cells.
• HIF-1α silencing attenuated alpha-synuclein-induced microglial migration.
• TLR7/8 blockade, but not TLR2, reduced HIF-1α accumulation.

Conclusions:

• Alpha-synuclein promotes microglial migration via TLR7/8-mediated enhancement of HIF-1α.
• HIF-1α, Src, and caveolin-1 signaling pathways are involved in alpha-synuclein-induced microglial migration.