Mice lacking basic fibroblast growth factor showed faster sensory recovery

Area of Science:

• Neuroscience
• Regenerative Medicine
• Molecular Biology

Background:

• Neurotrophic factors are crucial for peripheral nerve repair.
• Basic fibroblast growth factor (FGF-2) is upregulated post-nerve injury and regulates Schwann cell proliferation.
• FGF-2 plays a role in axonal maturation and remyelination.

Purpose of the Study:

• To investigate the functional impact of FGF-2 deficiency on sensory and motor nerve recovery after sciatic nerve crush.
• To elucidate the role of FGF-2 in the structural recovery of peripheral nerves.

Main Methods:

• Sciatic nerve crush injury model in FGF-2 deficient and wild-type mice.
• Functional assessments including pinch test, walking track analysis, and rotarod test.
• Histological and molecular analyses of nerve regeneration at 2 and 4 weeks post-injury.

Main Results:

• FGF-2 deficient mice showed faster recovery of mechanosensory function but not motor function.
• Two weeks post-injury, mutant mice exhibited increased axon and myelin size without changes in fiber numbers.
• Absence of FGF-2 led to significantly enhanced expression of myelin protein zero in lesioned nerves.

Conclusions:

• Loss of FGF-2 positively influences mechanosensory function recovery.
• FGF-2 deficiency transiently accelerates structural recovery, including increased axon and myelin size.
• Enhanced myelin protein zero expression in FGF-2 deficient mice suggests a role in accelerated remyelination.