Acute neuroinflammation induces AIS structural plasticity in a NOX2-dependent manner

Area of Science:

• Neuroscience
• Immunology
• Cell Biology

Background:

• Chronic neuroinflammation and oxidative stress are linked to neurodegenerative diseases, impacting neuronal integrity.
• Reactive microglia and reactive oxygen species (ROS) contribute to neuronal damage.
• Axon initial segment (AIS) disruption by microglia is associated with disease progression.

Purpose of the Study:

• To investigate the effects of acute neuroinflammation on AIS stability.
• To determine the role of ROS and calpain in inflammation-induced AIS plasticity.
• To explore the potential for therapeutic acceleration of AIS recovery.

Main Methods:

• Utilized C57BL/6J and NOX2 knockout mice treated with lipopolysaccharide (LPS) to induce acute neuroinflammation.
• Administered the anti-inflammatory drug Didox to assess its effect on AIS recovery.
• Assessed microglial inflammation via immunohistochemistry and RT-qPCR, and AIS integrity using ankyrinG immunolabeling.

Main Results:

• LPS-induced neuroinflammation altered AIS protein clustering in a ROS-mediated and calpain-dependent manner.
• AIS changes were reversible upon resolution of microglial inflammation.
• Ablation of NOX2 prevented inflammation-induced AIS plasticity, confirming ROS as a key driver.

Conclusions:

• Acute neuroinflammation induces adaptive, recoverable changes in the AIS.
• Therapeutic strategies targeting the AIS can accelerate recovery from inflammatory insults.
• The AIS represents a promising therapeutic target for neurodegenerative conditions.