周围神经再生时重组CNTF对受损神经元 STAT3表达和酪氨酸磷酸化的作用

目的 研究周围神经再生时，重组睫状神经营养因子(CNTF)对受损神经元JAK-STAT途径和酪氨酸磷酸化的作用。方法 用硅管套接切断的成年大鼠坐骨神经，术时在受损神经局部给予重组CNTF，用免疫组织化学ABC法结合计算机图像分析研究STAT3、磷酸化酪氨酸(PTyr)免疫反应阳性物质在L3～5段脊髓前角外侧核和L5脊神经节神经元中的分布和相对含量。结果 与生理盐水组相比，CNTF组脊髓前角外侧核神经元胞核STAT3和胞膜PTyr阳性物质的含量更高，脊神经节神经元胞浆和胞核，PTyr阳性物质的含量更高。结论 重组CNTF能激活和强化受损运动神经元的JAK-STAT途径，增强受损神经元的酪氨酸磷酸化。

EFFECTS OF RECOMBINANT CILIARY NEUROTROPHIC FACTOR ON STAT3 EXPRESSION AND TYROSINE PHOSPHORYLATION IN THE INJURED NEURONS DURING PERIPHERALNERVE REGENERATION

Objective To study effects of recombinant ciliary neurotrophic factor(CNTF) on the changes of JAK\|STAT pathway and tyrosine phosphorylation in the injured neurons. Methods Sciatic nerve of rat was resected and sutured into silicone tube with local infusion of recombinant CNTF.The distribution and quantity of STAT3 and phosphotyrosine(PTyr) immunoreactivity in the neurons of L3\|L5 spinal anteriolateral nuclei and L5 spinal ganglion were observed and measured by immunohistochemical ABC method with computer image analysis. Results There was much STAT3 immunoreactivity in the neuron located in the nucleus of spinal anteriolateral nuclei.PTyr immunoreactivity showed higher in the cell membrane of spinal anteriolateral nuclei and in the cytoplasma and neucleus of spinal ganglion in CNTF group than that in SAL group.Conclusion\ The results suggest JAK\|STAT pathway in the injured motoneurons be activated and strengthened and tyrosine phosphorylation in the injured neurons be enhanced by recombinant CNTF.