Polymerized Type I Collagen With Polyvinylpyrrolidone Reduces Fibrosis and Improves Nerve Organization and Myelination After Peripheral Nerve Injury.

Peripheral nerve injuries (PNI) cause a partial or total deficit of sensory and motor function, producing neuropathic pain and loss of productivity in adults. Type I collagen polymerized with polyvinylpyrrolidone (CLG-PVP) has been used previously in other fibrosing diseases due to its regulatory effects on interleukins, cytokines, and adhesion molecules. In the present study, we describe the role of CLG-PVP in the repair of PNI. We used a murine model of PNI through axonotmesis of the sciatic nerve. CLG-PVP treatments were administered in situ and intramuscularly and were compared to a sham procedure and placebo. Histological and histochemical-specific stain evaluations were performed to describe the structural changes in nervous tissue. A significant reduction in tissue fibrosis was observed in the groups treated with CLG-PVP, especially with the intramuscular treatment. Likewise, an increase in the organization of external lamina and nerve remyelination was observed in the treated groups. In addition, a slight improvement in gait was noted in the treated animal groups at the end of the study. After peripheral nerve injury, CLG-PVP restores the nerve's function, structure, and tissue organization. These therapeutic effects were more evident through the intramuscular administration scheme with a weekly dosage. However, randomized controlled clinical trials should be performed to verify its beneficial effects and characterize adverse events.