SNP、GLU及GABA对纹状体神经元活动的影响

目的　探讨一氧化氮(NO)在纹状体(STR)信息传递中的作用,对帕金森综合征(PD)的发病机制有更深入的了解,对PD的临床诊断及治疗有更深远的帮助。方法　本实验采用多管玻璃微电极微电泳方法观察了微电泳硝普钠(SNP)、谷氨酸(GLU)及γ- 氨基丁酸(GABA)对大鼠STR神经元自发放电的影响。同时观察了NO对GLU及GABA神经传递的影响。结果　实验观察到微电泳SNP可使77%(51 /66)受试神经元放电频率加快,其兴奋作用可被单硝基L -精氨酸甲酯(L NAME)所拮抗。在微电泳GLU或GABA过程中,给予SNP可增强GLU的兴奋作用,拮抗GABA的抑制作用。给予NOS抑制剂L- NAME可拮抗GLU的兴奋作用。结论　实验结果表明NO、GABA、GLU等神经递质活动在STR的同一神经元有会聚作用,NO、GLU对STR神经元有兴奋作用,而GABA对STR神经元有紧张性抑制作用。

Effects of SNP,GLU and GABA on the neuronal activity of striatum nucleus in rats

Aim The goal is to make a further comprehension of the pathogenesis of Parkinsons disease (PD) and hence add further knowledge for PD diagnosis by observing the functions of nitric oxide (NO) in striatum (STR). Method Microelectrodes were used to observe the effects of sodium nitroprusside (SNP), L-glutamic acid (GLU) and γ-aminobutyric acid (GABA) on STR neurons' spontaneous firing rates, and at the same time, we observed the effects of NO on GLU and GABA. Results 77% (51/66) of the tested neurons were excited by SNP, NO synthase inhibitor L-NAME antagonized the excitatory effect of SNP. Duringthe periods of microelectrophoresis GLU and GABA, SNP amplified the excitatory effect of GLU and weakened the inhibitory effect of GABA. L-NAME antagonized the excitatory effect of GLU.Conclusion These results demonstrated clearly that NO, GLU and GABA functions might converge in the same STR neurons. NO and GLU functions are excitatory whereas GABA function is inhibitory on the firing activities in STR neurons.