Sustained Serotonergic Stimulation Platform for Peripheral Axonal Regeneration.

Area of Science:

• Neuroscience
• Regenerative Medicine
• Pharmacology

Background:

• Peripheral nerve injury treatment remains a challenge.
• Serotonergic signaling is implicated in nerve regeneration, reinnervation, and neuronal guidance.

Purpose of the Study:

• To evaluate the efficacy of Zolmitriptan, a serotonin receptor agonist, in promoting peripheral neuroregeneration.

Main Methods:

• 24 female Sprague-Dawley rats underwent sciatic nerve transection or autograft repair.
• Zolmitriptan was administered locally via silk protein gels to experimental groups.
• Histological analysis and ex vivo diffusion tensor magnetic resonance imaging assessed axonal regeneration at 8 weeks.

Main Results:

• Zolmitriptan significantly enhanced regeneration in primary nerve repair groups (80% vs. 57% axonal extension).
• No significant difference was observed between Zolmitriptan and control groups in nerve autograft repair.
• Electron microscopy confirmed enhanced axonal regeneration in the Zolmitriptan-treated primary repair cohort.

Conclusions:

• Zolmitriptan may improve peripheral nerve regeneration, particularly in transection injuries.
• Further research is warranted for potential clinical translation of this neuroregenerative approach.