Protective Effect of Interleukin-1β on Motor Neurons after Sciatic Nerve Injury in Rats

Protective effect of interleukin 1β (IL 1β) on motor neurons was studied after peripheral nerve injury. Twenty Wistar rats were divided into 2 groups randomly. The right sciatic nerve of each rat was resected. After silicon tubulization of sciatic nerve in rat, 15 μl 1 ng/ml IL 1β and PBS solution were injected into the silicon capsule respectively. Enzyme histochemistry was performed to show acetyle cholesterase (AchE) and nitric oxide staining (NOS) activity of spinal α motor neurons in spinal segments 2 weeks later. Neurons were counted and the diameter and cross sectional (c/s) area of neurons were analyzed by using computer image analysis system. The results showed that as compared with the normal side, both enzyme activities significantly changed in motor neurons in PBS group. The diameter and c/s area of both neurons changed significantly too ( P< 0 01). These results suggest that exogenous IL 1β protects α motor neurons from degeneration and necrosis after peripheral nerve injury.

联合使用ATP和NGF对周围神经再生作用的实验研究

目的 研究三磷酸腺苷(adenosine tri-phosphate,ATP)和神经生长因子(nerve growth factor,NGF)联合使用时对受损周围神经再生的作用并比较两者作用的强弱。方法 将64只SD大鼠左侧坐骨神经切断后直接作端端缝合,缝合段置于硅胶管室内。根据室内注入药物的不同,分为生理盐水(NS)、ATP、NGF、和ATP加NGF 4组,每组16只大鼠。术后4周和8周(每组均为8只)取标本,作形态学,肌湿重,运动神经传导速度(MNCV)、复合运动动作电位(CMAP)波幅,及组织学的检测。结果 ATP加NGF组的神经纤维数目、大小、髓鞘厚度和MNCV、CMAP及肌湿重均优于其它3个组。NGF组的各项指标比ATP组好。结论 联合使用ATP和NGF时受损周围神经的再生作用明显增强。NGF的作用强于ATP。

纤维蛋白胶载神经生长因子促进周围神经再生的研究

目的 探讨纤维蛋白胶 (FG)作为神经生长因子 (NGF)载体对周围神经再生的促进作用。方法 将Wistar大鼠 96只随机分为 4组 ,即对照组、FG组、NGF组、FG +NGF组 ,每组 2 4只 ,以大鼠左侧坐骨神经为修复神经模型进行实验。术后 2、4、8周进行组织学检查 ,术后 8周进行电生理检查、肌湿重检测、图像分析和透射电镜观察。结果 FG +NGF组的神经传导速度、肌张力、肌湿重、有髓纤维截面积恢复率分别为 ( 84.10± 2 .33) %、( 83 .88± 2 .96 ) %、( 6 2 .5 4± 5 .94) %、( 71.0 1± 3 .6 2 ) % ,吻合口有髓纤维通过率为 ( 6 5 .5 1± 4.5 4) % ,高于对照组、FG组 ( P <0 .0 1) ,高于NGF组 (P <0 .0 5 ) ,FG +NGF组大鼠坐骨神经再生优于单纯NGF组。结论 纤维蛋白胶可作为NGF的载体 ,用纤维蛋白胶载NGF修复周围神经损伤 ,有促进周围神经再生的作用。