急性神经损伤引起脊髓背角C-纤维诱发电位长时程增强(英文)  

Acute nerve injury induces long-termpotentiation of C-fiber evoked field potentials in spinal dorsal horn of intact rat

作　　者：张红梅[1] 周利君[1] 胡晓东[1] 胡能伟[1] 张彤[1] 刘先国[1] 

机构地区：[1]中山大学中山医学院生理教研室,广州510089

出　　处：《生理学报》2004年第5期591-596,共6页Acta Physiologica Sinica

基　　金：This work was supported by the National Natural Science Foundation of China (No. 30070256 and No.30200076) CMB-SUMSScholarship (No.98-766) and a grant from Health department of Guangdong Province.

摘　　要：神经损伤引起神经病性疼痛,表现为持续性痛超敏和痛觉过敏.目前对神经病性疼痛的机制尚缺乏了解.我们以往的工作表明强直电刺激坐骨神经可引起脊髓背角C-纤维诱发电位的长时程增强(long-term potentiation,LTP),该LTP被认为是病理性疼痛的突触模型.本研究的目的在于探讨急性神经损伤是否能在完整动物的脊髓背角诱发出C-纤维诱发电位LTP.在以测试刺激(10～20 V,0.5 ms)电刺激坐骨神经的同时在脊髓背角用微电极记录C-纤维诱发电位.分别用强直刺激、剪断或夹捏坐骨神经诱导LTP.结果发现:(1)剪断或夹捏坐骨神经都可以诱导脊髓背角C-纤维诱发电位的LTP,该LTP可持续到实验结束(3～9h),在剪断神经前10 min用利多卡因局部阻滞坐骨神经则可完全阻断LTP的产生;(2)神经损伤诱导的LTP可被NMDA受体阻断剂AP5所阻断;(3)用单次强直刺激引起LTP后,切断坐骨神经可使LTP的幅度进一步增大,而用多次强直电刺激使LTP饱和后,损伤神经则不能使LTP进一步增大.切断神经引起LTP后,强直电刺激也不能使LTP进一步增大.这些结果表明,急性神经损伤可以诱导脊髓背角C纤维诱发电位LTP,且切断神经能更有效地诱导LTP.该试验进一步支持我们的设想,即脊髓背角C-纤维诱发电位LTP可能在病理性疼痛的形成中起重要作用.Nerve injury produces a long lasting neuropathic pain, manifested as allodynia, a decrease in pain threshold and hyperalgesia, an increase in response to noxious stimuli. The mechanism underlying the lasting abnormal pain is not well understood. Our previous works have shown that electrical tetanic stimulation of the sciatic nerve induces long-term potentiation (LTP) of C-fiber evoked field potentials in the spinal dorsal horn, which is considered as a synaptic model of pathlogical pain. In the present study we tested if nerve injury, which is proved to produce neuropathic pain, induced the spinal LTP in intact rats. C-fiber evoked field potentials in spinal dorsal horn produced by electrical stimulation (10~20 V, 0.5 ms, 1/min) of the sciatic nerve were recorded. For induction of LTP of C-fiber evoked field potentials, three types of noxious stimuli were applied. (1) Electrical tetanic stimulation (40 V, 0.5 ms pulses at 100 Hz for 1 s repeated four times at 10 s intervals). (2) Transection of the sciatic nerve at 4~5 mm distal to the stimulation electrode. (3) Crushing the sciatic nerve with a forceps four times at 4~5 mm distal to stimulation electrode (from distal to proximal with 1 mm spacing at 10 s intervals), which simulated electrical tetanic stimulation. Acute nerve injury was made by either transection of the sciatic nerve at the distal to the stimulating electrode or crushing the sciatic nerve. We found that nerve injury by cutting or crushing the sciatic nerve produced LTP of C-fiber evoked field potentials lasting until the end of the experiments (3~9 h), and that pretreatment of the sciatic nerve with lidocaine 10 min prior to the nerve transectoin completely blocked LTP induced by nerve transection. The nerve transection-induced LTP was blocked by NMDA receptor antagonist AP5. LTP produced by nerve transection could not be further potentiated by electrical tetanic stimulation, while LTP induced by single electrical tetanic stimulation could be further potentiated by transection of th

关 键 词：长时程增强 C-纤维 脊髓背角 神经损伤 病理性疼痛 

分 类 号：R363[医药卫生—病理学]