Direct Vagus Nerve Injection Protocol For Rats

Area of Science:

• Neuroscience
• Surgical Methodology
• Pharmacology

Background:

• Limited methods exist for direct drug delivery to the peripheral nervous system (PNS) compared to the central nervous system.
• Effective PNS drug delivery is crucial for treating autonomic nervous system disorders.

Purpose of the Study:

• To describe a detailed, reproducible microsurgical method for direct peripheral nerve injection.
• To establish a reliable technique for delivering therapeutic agents to the vagus nerve in a preclinical rat model.

Main Methods:

• A direct nerve injection procedure was developed and performed on the vagus nerve of anesthetized adult rats under a dissecting microscope.
• Microsurgical techniques were employed, with a tracking dye used for real-time monitoring of injection accuracy.
• The method details critical procedural steps and includes visual aids of successful and unsuccessful injections.

Main Results:

• The direct vagus nerve injection method was successfully implemented in six out of six trained rats without post-delivery complications.
• The procedure was demonstrated to be safe and well-tolerated by the animals.
• Injection fidelity was monitored effectively using a tracking dye.

Conclusions:

• Direct nerve injection is a viable and safe method for peripheral nervous system drug delivery in preclinical studies.
• This technique, exemplified by vagus nerve injection, can be adapted for other peripheral nerves and for delivering various agents, including gene therapy.
• The described method provides a valuable tool for researchers investigating PNS-targeted therapies.