脑瘫仔兔黑质-纹状体系神经元数量及超微结构研究

目的观察高胆红素血症致脑瘫动物模型黑质-纹状体系多巴胺能神经元数量及超微结构的变化,为深入研究手足徐动型脑瘫的神经病理学机制奠定基础,也为临床用药和早期康复提供依据. 方法生后2～5日龄仔兔30只,随机分为对照组10只和模型组20只.模型组给予腹腔分次注射胆红素,总量为300 mg/kg体重;对照组给予腹腔注射同等剂量的生理盐水.注射后2组仔兔均母乳喂养至45 d.将鉴定为脑瘫模型的仔兔和对照组仔兔均处死,TH染色进行神经元定量分析及超微结构观察. 结果①模型组黑质及纹状体神经元超微结构较对照组有明显改变;②模型组黑质及纹状体TH阳性神经元数明显少于对照组(P<0.01). 结论脑瘫仔兔黑质及纹状体超微结构明显改变,黑质-纹状体系多巴胺能神经元损伤,神经元数量减少.

Study of quantity of neuron and ultrastructure in nigra-striatum of cerebral palsied newborn rabbits

Objective To explore the quantity and ultrastructure of dopaminum (DA) neuron in nigra-striatum, pathological basis of the successful animal model of cerebral palsy (CP) by hyperbilirubinemia, to provide the evidence for clinical therapy and rehabilitation. Methods Thirty homozygous newborn rabbits (2~5 d) were randomly divided into 2 groups: a control group(n=10) and a model group(n=20). The rabbits in the control group were administrated bilirubin intraperitoneally, with a total dose of 300 mg/kg, while those in the model group were administrated with saline at the same dose. All the animals were fed well for 45 days until they were sacrificed for observation of the ultrastructure of brain tissue and quantification of DA neurons. Results The ultrastructure of nigra-striatum of the control group demonstrated significant changes; The quantity of nigra-striatum DA neurons of the control group decreased. Conclusion The ultrastructure of nigra-striatum of the control group has had obviously changes. The nigra-striatum DA neuron of CP rabbits was impaired and the quantity of nigra-striatum DA neuron of CP rabbits was reduced.