大鼠坐骨神经修复后重组睫状神经营养因子对相关神经元生长相关蛋白43、生长抑素表达的影响

目的观察周围神经修复后，重组睫状神经营养因子(CNTF)对相关神经元中生长相关蛋白表达的调控作用。方法用硅管套接切断的成年大鼠坐骨神经，在神经切断处给予重组CNTF，用免疫组织化学和原位杂交组织化学方法结合计算机图像分析观测L4脊髓和L4、L5脊神经节中生长相关蛋白43(GAP43)和生长抑素(SOM)mRNA的相对含量。结果在CNTF组修复侧脊髓前角外侧核，大、中型神经元胞质中神经元GAP43阳性物质的面积百分率显著高于生理盐水组，SOM mRNA杂交信号阳性的大、中型神经元的数量少于生理盐水组，但两组脊神经节的相应指标无显著差别。结论坐骨神经修复后，外加重组CNTF能上调相关运动神经元表达GAP43，下调其表达SOM mRNA，但对感觉神经元的相应作用不明显。

Effects of recombinant ciliary neurotrophic factor on expression of growth associated protein 43 and somatostatin in the related neurons after sciatic nerve repair in rats

Objective To study the effects of recombinant ciliary neurotrophic factor(CNTF)on expression of growth related proteins in related neurons after sciatic nerve repair in rats. Methods After a segment of the sciatic nerve of the rat was removed, the distal and proximal ends were sutured into a recombinant CNTF-containing silicone tube. Growth associated protein 43 (GAP-43) and somatostatin (SOM) in the L4 spinal cord, L4 or L5 spinal ganglia were examined and measured by immunohistochemistry and in situ hybridization using computerized image processing system. Results An increase in the GAP-43 immunoreactivity in the large, medium neurons of spinal anterolateral nucleus was more significant in the CNTF-treated group compared with those in the 0.9% saline (SAL)-treated group, while a decrease in SOM mRNA hybridization signals in those neurons were more significant in the CNTF-treated group. There were no significant differences in the aforementioned immunoreactivity and hybridization signals of spinal ganglia between the CNTF-treated group and the SAL-treated group. Conclusion The results suggest that recombinant CNTF administration up-regulate GAP-43 expression and down-regulate SOM mRNA expression in the related motor neurons, but not sensory neurons, after reconnection of transected sciatic nerve.