A NIR Dye for Development of Peripheral Nerve Targeted Probes

Area of Science:

• Biomedical Engineering
• Optical Imaging
• Neuroscience

Background:

• Current imaging techniques are insufficient for rapid nerve injury assessment and outcome prediction.
• Non-invasive methods are crucial for early intervention to prevent chronic pain and functional loss.
• Developing nerve-specific near-infrared (NIR) molecular probes is a key long-term goal for diagnosing nerve damage.

Purpose of the Study:

• To evaluate a novel hydrophilic polymethine dye as a potential near-infrared (NIR) fluorescent reporter for nerve imaging.
• To compare the properties of the novel dye with indocyanine green (ICG) within the rat sciatic nerve.
• To assess dye performance at critical imaging depths, the impact of hydrophilicity on tissue transport, and neural toxicity.

Main Methods:

• Intra-nerve injection of a novel hydrophilic polymethine dye and indocyanine green (ICG) into the sciatic nerve of rats.
• Evaluation of dye fluorescence reporting at relevant depths for nerve imaging.
• Assessment of dye hydrophilicity's effect on transport through neural tissue and assessment of neural toxicity.

Main Results:

• The novel NIR dye demonstrated appropriate reporting ability at critical depths for nerve imaging.
• Hydrophilicity was found to be important for dye transport within nervous tissue.
• The novel dye exhibited minimal toxicity to the neural environment.

Conclusions:

• The novel hydrophilic NIR dye is a suitable fluorescent reporter for developing nerve-specific optical molecular probes.
• This research supports the advancement of non-invasive optical techniques for diagnosing and classifying peripheral nerve injuries.
• The findings pave the way for improved early intervention strategies for nerve damage.