A study of the influence of occlusal activity on the characteristics of tongue and masticatory muscles using non-occlusal model animal

本研究试图阐明咬合活动对咀嚼肌突触发生的贡献。在咬肌的米/米，nAChR消除启动，但没有正常进展后，3周龄，当咬合活动出现在+/+小鼠，而nAChR开关进展正常，在整个期间的突触。nAChR亚单位mRNA在迷走神经颞肌和二腹肌的表达模式与咬肌不同。这些研究结果表明，在咬肌，咬合活动是必不可少的nAChR消除的完成，但不是nAChR开关，和咬合活动的突触发生的贡献不同的咀嚼肌。

The present study attempted to elucidate the contribution of occlusal activity to synaptogenesis in masticatory muscles. In the masseter of the mi/mi, the nAChR elimination initiated, but did not progress normally after 3 weeks of age, when the occlusal activity emerged in the +/+ mouse, whereas the nAChR switch progressed normally during the entire period of synaptogenesis. The mRNA expression patterns of nAChR subunits in the temporalis and digastric of the mi/mi differed from those in its masseter. These findings suggest that, in the masseter, occlusal activity is essential for the completion of nAChR elimination, but not for the nAChR switch, and that the contribution of occlusal activity to synaptogenesis varies among the masticatory muscles.