华西口腔医学杂志

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前伸青春期大鼠下颌后翼外肌细胞膜乙酰胆碱受体特性变化的研究

陈开云,罗颂椒   

  1. 510280 广东省口腔医院正畸科(陈开云),四川大学华西口腔医院正畸科(罗颂椒)
  • 收稿日期:2003-10-25 修回日期:2003-10-25 出版日期:2003-10-20 发布日期:2003-10-20

Characteristic Changes of Acetylcholine Receptor in Rat Lateral Pterygoid Muscles after Functional Mandibule Advance- ment

CHENKaiyun*,LUO Songjiao   

  1. *Department of Orthodontics,Oral Hospital of Guangdong Province,Guangzhou510280, China
  • Received:2003-10-25 Revised:2003-10-25 Online:2003-10-20 Published:2003-10-20

摘要:

目的 研究功能矫形前伸青春期大鼠下颌后,翼外肌细胞膜乙酰胆碱受体最大结合容量和亲和性的变化,探讨功能矫形的神经肌肉调控机理。方法 选用40只5周龄SD雄性大鼠,随机分为实验组和对照组各20 只。实验组大鼠戴自制上颌功能矫治器,引导下颌前伸,对照组不做任何处理,分别在实验第1、3、7、14天处死大鼠,采用放射受体分析法测定2组大鼠翼外肌肌细胞膜上乙酰胆碱受体的最大结合容量和亲和常数。结果 实验组大鼠翼外肌细胞膜上乙酰胆碱受体最大结合容量明显大于对照组,具有高度亲和力。结论 功能矫形可增加翼外肌细胞膜上乙酰胆碱受体与乙酰胆碱的结合量。

关键词: 功能矫形, 翼外肌, 乙酰胆碱受体

Abstract:

Objective The purpose of this study was to evaluate the maximum binding(Bmax) and affinity(Kd value) changes of acetylcholine receptor (n-AchR) in rat lateral pterygoid muscles after functional mandibule advancement.Methods  40 five-weeks-old male Sprague-Dawley ratswere equally divided into experimental and control group. The mimic functional appli- ances were used in experiment group and the ratswere killed after 1, 3, 7, 14 days. Radio-ligand binding assay (RBA) was ap- plied to determine the maximum binding(Bmax) and Kd value of n-AchR of lateral pterygoid muscle.Results The Bmax of n- AchR in experimental group was higher than that in control group and the Kd value always kept in high level.Conclusion The functional orthopedics can increase the Bmax of n-AchR in rapid growing rat lateral pterygoid muscles.

Key words: functional orthopedics, lateral pterygoid, acetylcholine receptor