Development of a mouse nerve-transfer model for brachial plexus injury

Area of Science:

• Neuroscience
• Regenerative Medicine
• Surgical Innovation

Background:

• Nerve transfer is a surgical technique using healthy nerve portions to repair injured nerves, notably for traumatic brachial plexus injuries.
• Studying the neural mechanisms of nerve transfer requires reliable experimental models.
• Existing models may not fully capture the complexities of nerve regeneration and re-innervation.

Purpose of the Study:

• To develop and validate a novel ulnar-musculocutaneous nerve-transfer model in mice.
• To enable physiological and morphological evaluation of the re-innervation process following nerve transfer.
• To investigate the temporal dynamics of re-innervation compared to direct nerve repair.

Main Methods:

• Established an ulnar-musculocutaneous nerve-transfer model in mice, re-innervating the biceps muscle with a donor ulnar nerve.
• Compared muscle action potentials, re-innervated acetylcholine receptor (AChR) clusters, and muscle spindles between nerve transfer and direct nerve repair groups.
• Analyzed morphological and physiological parameters at 4 and 24 weeks post-surgery.

Main Results:

• The nerve transfer model demonstrated successful re-innervation, evidenced by comparable muscle action potentials to direct nerve repair.
• Both nerve transfer and direct repair groups showed re-innervated AChR clusters and muscle spindles.
• Nerve transfer exhibited fewer AChR clusters at 4 weeks but equalized by 24 weeks, indicating a delayed re-innervation process.

Conclusions:

• The developed ulnar-musculocutaneous nerve-transfer model is effective for studying nerve regeneration and re-innervation in mice.
• The model confirms a delay in the re-innervation process associated with nerve transfer compared to direct nerve repair.
• This model offers significant potential for advancing research into nerve transfer procedures and functional recovery.