Isograft Obtained From ZDF (Obese Fa/Fa) Rats Does Not Impair Nerve Regeneration Compared to Healthy Isograft

Area of Science:

• Regenerative Medicine
• Diabetic Neuropathy Research
• Nerve Repair and Regeneration

Background:

• Nerve autografts are a standard for nerve defect reconstruction.
• Clinical evidence for autograft superiority over processed nerve allografts (PNA) is limited.
• Diabetic conditions may negatively impact autograft quality.

Purpose of the Study:

• To evaluate the impact of diabetes on nerve autograft quality.
• To determine if diabetic-derived nerve grafts exhibit inferior neuro-regenerative properties.
• To establish an appropriate small animal model for testing this theory.

Main Methods:

• Utilized Zucker Diabetic Fatty (ZDF) rats (n=10) as diabetic donors and lean ZDF rats (n=10) as healthy controls.
• Harvested sciatic nerves and used them to reconstruct a 15 mm defect in 40 lean ZDF rats.
• Performed motor testing and nerve histology at 16 weeks post-reconstruction.

Main Results:

• No significant difference in axonal counts between diabetic-derived and healthy-derived grafts.
• Diabetic-derived grafts showed comparable or superior functional recovery in terms of twitch force, tetanic force, muscle mass, and girth ratio.
• Average twitch force in the diabetic donor group was 82% ± 33% compared to 67% ± 28% in the healthy graft group.

Conclusions:

• Nerve isografts from diabetic donor rats did not show inferior nerve regeneration compared to healthy isografts.
• Diabetes in the donor may not compromise the neuro-regenerative capacity of autologous nerve grafts.
• Findings challenge the assumption that diabetes inherently degrades nerve graft quality for reconstruction.