The Laryngoscope · 2005
Effects of denervation on neuromuscular junctions in the thyroarytenoid muscle.
СтатьяНазвание и аннотация: Перевод в очереди
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Kumai Yoshihiko, Ito Takaaki, Matsukawa Akihiro, Yumoto Eiji
Аннотация
OBJECTIVES/HYPOTHESIS: To evaluate the effects of denervation on muscle fibers and neuromuscular junctions (NMJ) of the rat thyroarytenoid (TA) muscle with a histochemical method to monitor the status of degenerative NMJ.
STUDY DESIGN: Quantitative assessment to monitor the status of degenerative muscle fibers and NMJ in the TA muscle.
METHODS: Wistar rats were killed at 6, 12, 18, and 24 hours and at 2, 4, and 10 weeks after left recurrent laryngeal nerve (RLN) transection. Hematoxylin-eosin stain was used to evaluate the atrophic changes of the TA muscle. The pre- and postsynaptic structures of the NMJ were detected histochemically. These changes were evaluated by comparing the results between the treated (T) and untreated (U) sides (T/U ratio) in the same section.
RESULTS: The atrophic changes in the TA muscle progressed gradually, and at 10 weeks, the T/U ratios of the entire muscle area and of the muscle fiber size decreased to 53.2 +/- 10.7% and 55.5 +/- 6.8%, respectively (P < .01). The number of nerve terminals decreased significantly at 18 hours (P < .01), and they disappeared completely by 24 hours. In contrast, at 10 weeks, 70.5 +/- 12.4% (P < .01) of acetylcholine receptors (AchRs) were preserved.
CONCLUSIONS: In the rat TA muscle, denervation influences the presynaptic nerve terminals more than the postsynaptic AchRs and the muscle fibers. The results could be a basis for understanding the mechanism of laryngeal denervation and reinnervation processes in animal models.
STUDY DESIGN: Quantitative assessment to monitor the status of degenerative muscle fibers and NMJ in the TA muscle.
METHODS: Wistar rats were killed at 6, 12, 18, and 24 hours and at 2, 4, and 10 weeks after left recurrent laryngeal nerve (RLN) transection. Hematoxylin-eosin stain was used to evaluate the atrophic changes of the TA muscle. The pre- and postsynaptic structures of the NMJ were detected histochemically. These changes were evaluated by comparing the results between the treated (T) and untreated (U) sides (T/U ratio) in the same section.
RESULTS: The atrophic changes in the TA muscle progressed gradually, and at 10 weeks, the T/U ratios of the entire muscle area and of the muscle fiber size decreased to 53.2 +/- 10.7% and 55.5 +/- 6.8%, respectively (P < .01). The number of nerve terminals decreased significantly at 18 hours (P < .01), and they disappeared completely by 24 hours. In contrast, at 10 weeks, 70.5 +/- 12.4% (P < .01) of acetylcholine receptors (AchRs) were preserved.
CONCLUSIONS: In the rat TA muscle, denervation influences the presynaptic nerve terminals more than the postsynaptic AchRs and the muscle fibers. The results could be a basis for understanding the mechanism of laryngeal denervation and reinnervation processes in animal models.