Effects of Sphingosine-1-Phosphate on the Facilitation of Peripheral Nerve Regeneration.

This study aims to explore the role of sphingosine-1-phosphate (S1P) in peripheral nerve regeneration after injury. S1P is a crucial metabolite involved in cell migration, inflammation, and nerve regeneration. In this research, six-week-old male Sprague-Dawley rats (total n=18) underwent transection of the inferior alveolar nerve (IAN) and were divided into three groups: S1PR agonist (FTY720) (n=6), saline control (n=6), and S1P1R antagonist (n=6). Regeneration was assessed using immunostaining and retrograde tracing. Results showed that the S1PR agonist group had superior axonal and Schwann cell regeneration compared to controls. Additionally, the combination with S1P1R antagonists inhibited the effects of the agonists, further confirming the potential role of S1P1R in nerve repair. Our results suggest that mediating S1P1R signaling could facilitate the regeneration of peripheral nerves after injury.