摘要
目的 观察6- 羟多巴胺毁损的帕金森病(Parkinson’sdisease, PD)模型大鼠脚桥核(pedunculopontinenu cleus, PPN)神经元放电频率和放电形式的变化。方法 采用在体玻璃微电极细胞外记录法,记录正常对照组和PD模型组大鼠PPN神经元的电活动。结果 对照组和PD组大鼠PPN神经元的放电频率分别为(9. 0±0. 8)Hz[ (0. 5 25. 2)Hz, n=56]和(16. 1±1. 6)Hz[ (1. 2 49. 7)Hz, n=57],PD组大鼠的放电频率显著高于对照组(P<0. 001)。在对照组大鼠脚桥核, 68% (38 /56)的神经元呈现规则放电, 27% (15 /56)呈现不规则放电, 5% (3 /56)为爆发式放电;在PD组大鼠脚桥核,具有规则、不规则和爆发式放电的神经元比例分别为39% (22 /57)、47%(27 /57)和14% (8 /57),PD组大鼠具有不规则放电的神经元比例明显高于对照组(P<0. 05)。结论 PD大鼠PPN中神经元的放电频率增高和不规则放电增多, 这可能在帕金森病的病理生理变化中具有重要作用。
Objective To explore the change in the firing rate and firing pattern of pedunculopontine nucleus (PPN) neurons in 6-hydrodopamine (6-OHDA) unilaterally lesiond rats. Methods Electrophysiological recordings of PPN neurons were done in normal rats and 6-OHDA lesiond rats with standard single unit glass microelectrode method in vivo . Results The firing rate of PPN neurons in normal rats and 6-OHDA lesiond rats were (9.0±0.8) Hz \[(0.5-25.2) Hz, n =56\] and (16.1±1.6) Hz \ and (16.1±1.6) Hz \[(1.2-49.7) Hz, n =57),respectively. The firing rate of 6-OHDA lesioned rats was significantly increased when compared to control rats ( P <0.001). Concerning the firing pattern, 68% (38/56) of the neurons recorded discharged regularly, 27% (15/56) exhibited an irregular pattern and 5% (3/56) discharged in bursts in normal rats. In 6-OHDA lesioned rats, 39% (22/57) discharged regularly, 47% (27/57) exhibited an irregular pattern and 14% (8/57) in bursts. The number of PPN neurons in 6-OHDA lesioned rats fired irregularly was significantly higher than in control rats ( P <0.05). Conclusion The firing rate and the percentage of the irregularly firing neuron in PPN of 6-OHDA lesioned rats increased significantly, which may be contributed to the pathophysiological changes of Parkinson’s disease.
出处
《神经科学通报》
CSCD
2005年第2期146-152,共7页
Neuroscience Bulletin
