Sustained GSK3 activity markedly facilitates nerve regeneration

Area of Science:

• Neuroscience
• Molecular Biology
• Regenerative Medicine

Background:

• Peripheral nerve injury impairs axonal growth and functional recovery.
• Glycogen synthase kinase 3 (GSK3) is inactivated by PI3K/AKT signaling after sciatic nerve crush (SNC).
• The role of GSK3 phosphorylation in nerve regeneration is debated.

Purpose of the Study:

• To investigate the role of GSK3 phosphorylation in peripheral nerve regeneration.
• To determine if blocking inhibitory GSK3 phosphorylation enhances axon growth and functional recovery after SNC.

Main Methods:

• Utilized knock-in mice with GSK3 isoforms resistant to PI3K/AKT phosphorylation.
• Assessed DRG neuron axon growth in vitro and in vivo after SNC.
• Evaluated functional recovery following SNC.

Main Results:

• Accelerated axon growth of DRG neurons in culture and in vivo after SNC.
• Markedly enhanced functional recovery after SNC compared to controls.
• GSK3 activity-dependent effects linked to increased MAP1B phosphorylation.

Conclusions:

• PI3K/AKT-mediated GSK3 inhibition limits nerve regeneration after injury.
• Suppressing this inhibitory pathway may offer novel therapeutic strategies for nerve repair.
• Targeting GSK3 offers a potential clinical approach for treating nerve injuries.