华西口腔医学杂志

• 基础研究 • 上一篇    下一篇

bcl-2、Bax基因在面神经损伤后面神经元的表达及对神经元凋亡的调节

杨军,方泽强,李慧增,张从纪   

  1. 400038 第三军医大学附属西南医院口腔科
  • 收稿日期:2001-12-25 修回日期:2001-12-25 出版日期:2001-12-20 发布日期:2001-12-20

Expression ofbcl-2andBaxGenes in Facial Neurons and Their Regulation of Neuron Apoptosis Following Facial Neurotmesis in Rats

Yang Jun, Fang Zeqiang, Li Huizeng, et al   

  1. The Department of Stomatology, Southwest Hospital, the Third Military Medical University
  • Received:2001-12-25 Revised:2001-12-25 Online:2001-12-20 Published:2001-12-20

摘要:

目的:探讨切断面神经干后面神经元bcl-2、Bax基因表达变化与面神经元细胞凋亡的关系。方法:将60只成年Wistar大白鼠左侧面神经干切断作为实验组,右侧面神经干未切断作为对照组。应用ABC免疫组化染色方法和原位末端标记法(TUNEL)观察术后3、7、15、21、30、60 d实验组与对照组面神经元内bcl-2、Bax基因的表达及面神经元凋亡的情况。结果:切断面神经干后3 d,bcl-2、Bax基因表达开始增多,21 d达高峰(P<0101),bcl-2/Bax比值达最低(P<0101);切断面神经干后3 d,实验组面神经元凋亡较对照组增多,21 d达凋亡高峰(P<0101)。结论:bcl-2、 Bax基因参与了面神经干切断诱导的面神经元凋亡过程的调控。

关键词: bcl_2, Bax, 凋亡, 面神经元, 轴突切断, 基因调控, 大鼠

Abstract:

Objective:The aim of this study is to investigate the relationship between the expression changes ofbcl-2andBaxgenes and their functions in facial neuronal apoptosis after amputating the facial nerve.Methods:Ratswere randomized into two groups, in- cluding the experimental and the control group. The changes of expression ofbcl-2andBaxgenes in the facial neurons and facial neuronal apoptosis were observed after the facial nerve amputation using the methods of ABC immunohistochemical staining and TUNEL.Results:The expression ofbcl-2andBaxgenes and the apoptosis of facial neuronswere significantly higherin the exper- imental group than those of the control group from the 3rd to 21st day after amputation, but thebcl-2/Baxsignificantly decreased compared with that of the control group.Conclusion:This indicated thatbcl-2andBaxmight play an important regulation role in the process of facial neurons apoptosis following facial nerve amputation.

Key words: bcl_2, Bax, apoptosis, facial neurons, neurotmesis, rats