摘要
目的研究受损背根节(DRG)神经元对不同时间序列的交感神经刺激反应.方法采用单纤维记录神经元自发放电的方法,在DRG慢性压迫模型上,电刺激腰交感神经干,比较受损DRG神经元对周期和混沌的交感神经刺激的反应.结果慢性压迫DRG中存在交感-感觉耦联现象.受损DRG神经元对交感神经刺激的反应随刺激频率(在5～20Hz范围内)的增加而增大(p＜0.01).将刺激平均频率和刺激强度相同而刺激时间序列不同的交感神经刺激引起受损DRG神经元的反应进行比较发现,混沌的交感神经刺激引起的反应比周期的交感神经刺激引起的反应大(P＜0.01).结论除刺激频率外,交感神经刺激的时间序列是影响受损DRG神经元反应的重要因素,混沌刺激引起的效应比周期刺激效应强,突触前神经元的混沌放电比周期放电可引起更大的突触后效应,神经元的混沌放电可能是神经传递信息的一种有效形式.
Objective To study the responses of injured dorsal root ganglion (DRG) neurons to sympathetic nerve stimulation with different time sequences. Method In chronically compressed DRG model, the spontaneous activity of the single fiber from injured DRG neurons was recorded, and the responses of DRG neurons to chaotic and periodic electric stimulation of the lumbar sympathetic trunk compared. Results Sympathetic-sensory coupling was present in chronically compressed DRG neurons, and the response of DRG neurons increased gradually as the sympathetic stimulating frequency increased from 5 to 20 Hz (P<0.01). The chaotic stimulation evoked much greater response than periodic stimulation, even though the stimulating frequency was similar (P<0.01). Conclusions Besides the stimulating frequency, the time sequence of the stimulation is one of the important factors that influence the response of DRG neurons to sympathetic stimulation. Chaotic sympathetic stimulation causes greater response than periodic stimulation does, and the chaotic activity of presynaptic neuron evokes greater postsynaptic response than periodic activity. The chaotic activity of the neurons might be one of the effective ways for information transmission through the nerves.
出处
《第一军医大学学报》
CSCD
北大核心
2003年第11期1181-1183,1187,共4页
Journal of First Military Medical University
基金
国家自然科学重点基金(30030040)~~
关键词
交感神经
刺激反应
大鼠
背根节受损
神经元
自发放电
dorsal root ganglion
spontaneous activity
sympathetic-sensory coupling
neural code
neuron
