STING regulates peripheral nerve regeneration and colony stimulating factor 1 receptor (CSF1R) processing in...

Area of Science:

• Neuroscience
• Immunology
• Regenerative Medicine

Background:

• Peripheral nerve injury (PNI) triggers inflammatory responses essential for regeneration.
• The cyclic GMP-AMP synthase (cGAS)/stimulator of interferon genes (STING) pathway senses DNA and initiates immune responses.
• This pathway is upregulated in naive rats and dysregulated in old rats post-PNI.

Purpose of the Study:

• To investigate the role of the cGAS/STING pathway in peripheral nerve regeneration.
• To determine the effect of STING knockout on functional recovery and cellular responses following PNI.

Main Methods:

• Utilized a nerve crush mouse model with STING knockout (KO).
• Assessed myelin content, macrophage infiltration, and microglia activation post-injury.
• Examined colony stimulating factor 1 receptor (CSF1R) processing and microglia survival in vitro.

Main Results:

• STING knockout mice showed increased myelin content and accelerated functional axon recovery.
• STING KO mice exhibited reduced macrophage numbers in the sciatic nerve and decreased spinal cord microglia activation one week post-injury.
• STING activation influenced CSF1R processing and microglia survival in vitro.

Conclusions:

• The cGAS/STING pathway plays a significant, previously unrecognized role in regulating nerve regeneration.
• Inhibition of STING may represent a novel therapeutic strategy to enhance recovery from peripheral nerve injury.