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Pathogenesis of the gradually elongated nerve
1Department of Orthopaedic Surgery, School of Medicine, Kanazawa University, Japan. seikei@kenroku.ipc.kanazawa-u.ac.jp
Abstract:
The rabbits' sciatic nerves were lengthened by 30 mm in increments of 2.0 mm/day (2-mm group) and 4.0 mm/day (4-mm group). In the 2-mm group, the phosphorylated neurofilament (p-NF) immunoreactivity of axons was similar to that of the control group. However, in the 4-mm group, number of p-NF positive axons decreased. The number of p-NF positive cells at the seventh lumbar dorsal root ganglion cells of the 4-mm group was significantly larger than that of the control group. Abnormal p-NF immunoreactivity in the 4-mm group suggested an impairment of the axonal flow. Leakage of Evans blue-albumin into the endoneurial space, which meant destruction of the blood-nerve barrier function, was clearly evident in the 4-mm group, but minor in the 2-mm group. A speed of 2.0 mm/day, therefore, appears to be critical for safe nerve elongation in this model.
Insights
Nerve elongation at 4.0 mm/day impaired axonal flow and blood-nerve barrier function in rabbits. A slower rate of 2.0 mm/day is critical for safe nerve elongation, preserving nerve integrity.
Area of Science:
- Neuroscience
- Regenerative Medicine
Background:
- Nerve elongation is crucial for regenerating damaged nerves.
- Understanding the optimal rate for nerve elongation is vital to prevent injury.
Purpose of the Study:
- To investigate the effects of different nerve elongation rates on sciatic nerve integrity in rabbits.
- To determine a safe threshold for nerve elongation speed.
Main Methods:
- Rabbits' sciatic nerves were lengthened at 2.0 mm/day (2-mm group) and 4.0 mm/day (4-mm group).
- Assessed phosphorylated neurofilament (p-NF) immunoreactivity and axonal flow.
- Evaluated blood-nerve barrier integrity using Evans blue-albumin leakage.
Main Results:
- The 4.0 mm/day group showed decreased p-NF positive axons and increased p-NF positive cells in dorsal root ganglia, indicating axonal flow impairment.
- Significant Evans blue-albumin leakage in the 4-mm group demonstrated blood-nerve barrier destruction.
- The 2.0 mm/day group exhibited minor blood-nerve barrier disruption compared to controls.
Conclusions:
- Nerve elongation at 4.0 mm/day significantly compromises axonal transport and nerve barrier function.
- A nerve elongation rate of 2.0 mm/day appears to be a critical threshold for maintaining sciatic nerve integrity in this rabbit model.