Influence of Netrin-1 on Reinnervation of Laryngeal Muscles Following Recurrent Laryngeal Nerve Injury
Cell Biology and Anatomy
Following recurrent laryngeal nerve (RLN) injury, recovery results in poor functional restitution of the paralyzed vocal fold. Netrin-1 has been found to be upregulated in the rat posterior cricoarytenoid muscle (PCA) during nerve regeneration. We evaluated the effect of ectopic Netrin-1 in the PCA during RLN reinnervation. The right RLN was transected and Netrin-1 was injected into the PCA (2.5, 5, 10, 15, 20μg/ml). At 7 days post injury fluorescent retrograde tracer was injected into the PCA and Thyroarytenoid (TA) muscles. At 9 days tissues were harvested. Immunostaining showed reinnervation patterns in the laryngeal muscles and labelled motoneurons in the nucleus ambiguus. Lower concentrations of Netrin-1 (2.5 and 5μg/ml) showed no significant changes in laryngeal muscles reinnervation. Higher concentrations of Netrin-1 significantly reduced motor end plate innervation. The most effective dose was 10μg/ml showing reduced number of innervated motor endplates in the PCA. The somatotopic organization of the nucleus ambiguus was altered in all concentrations of Netrin-1 injection. These findings indicate that injection of Netrin-1 into the PCA changes the reinnervation pattern of the RLN.
Hernandez-Morato, I., Koss, S., Sharma, S., & Pitman, M. (2017). Influence of Netrin-1 on Reinnervation of Laryngeal Muscles Following Recurrent Laryngeal Nerve Injury. Neuroscience Letters, 653, 244-249. https://doi.org/10.1016/j.neulet.2017.05.033
Originally published in Neuroscience Letters, 653, 244-249. The original material can be found here.