摘要
目的 :探讨周围神经损伤及修复后神经干睫状神经营养因子 (CNTF)的表达及分布。 方法 :以犬喉返神经损伤及修复再生为实验模型 ,采用原位杂交及免疫组织化学技术 ,结合图像分析技术检测 CNTF m RNA及其蛋白反应产物的灰度及面积。 结果 :正常神经 CNTF位于神经膜细胞中。神经切断后远段神经干 CNTF表达迅速下降 ,6周后消失。随着神经的再生CNTF表达逐渐增加 ,表达产物分布于包绕再生轴突及髓鞘的神经膜细胞质中 ,CNTF蛋白还出现于再生的轴突中。神经再生完成后 ,表达仍明显低于正常状态。近段神经干也出现类似远段的改变。 结论 :再生神经 CNTF的表达呈下调型并与轴突再生有关 ;CNTF的重分布为神经再生提供合适的微环境。
Objective:To explore the expression and distribution of ciliary neurotrophic factor (CNTF) in laryngeal nerve degeneration and regeneration. Methods:Transection of the recurrent laryngeal nerves in 8 dogs and suture following transection in 12 cases were performed. Both proximal and distal ends of transected or sutured region were sectioned at various survival times for CNTF immunohistochemistry and CNTF mRNA in situ hybridization. The area and intensity of reactive product were measured by computer image processing system. Results:After nerve transection, reactive product of CNTF mRNA and its protein reduced rapidly in distal stumps, after neurorrhaphy, they were observed in thin Schwann cell processes ensheathing axons and not found in the proliferating Schwann cells which didn′t ensheathe axons. CNTF immunoreactivity was also detected in the regenerated nerve axons. CNTF expression increased with survival time, but even at the longest survival time, it was still significantly less than that in intact nerve. The same change was observed in a short segment proximal to the transected or sutured region. Conclusion:CNTF expression is in the down regulation and is collected with Schwann cell axon in peripheral nerve degeneration and regeneration. The changed distribution of CNFT might provide a supportive environment for axonal regeneration.
出处
《第二军医大学学报》
CAS
CSCD
北大核心
2002年第6期605-607,共3页
Academic Journal of Second Military Medical University
基金
国家自然科学基金资助项目 (3 960 0 162 )
