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目的 观察睫状神经生长因子 ( ciliary neurotrophicfactor,CNTF)和雪旺细胞神经营养活性物质 ( Schwann cellsneurotrophic agent,SCNA)对视神经损伤后轴突的形态和纤维数目变化的作用 .方法 采用镊夹法制作大鼠视神经损伤模型 ,损伤后立即一次性向玻璃体内注射 CNTF( 5 0 ng)或SCNA ( 10μL ) ,在损伤后 1,2 ,3和 4 wk时观察夹伤视神经的形态 ,及进行图像分析和轴突纤维计数 .结果 损伤后视神经轴突减少 ,间质增多 .CNTF组和 SCNA组的轴突数密度在 1wk时分别为正常值 ( 0 .10 65± 0 .0 0 5 6个·μm- 2 )的0 .5 9和 0 .61,而对照组为 0 .5 5 ,实验组与对照组比较差异显著 ( P<0 .0 5 ) .但在夹伤 2 wk后 3个组间、各时间点间数据差异均不显著 ( P>0 .0 5 ) .结论 CNTF及 SCNA一次玻璃体给药能在 1wk内减缓视神经损伤后轴突数目的减少 .
Objective To observe the effects of ciliary neurotrophic factor (CNTF) and Schwann cells neurotrophic agent (SCNA) on the changes of axon morphology and fiber number after optic nerve injury.Methods Rat models of optic nerve injury were injected intravitreally with CNTF (50 ng) or SCNA (10 μL) immediately after injury. Morphology of injured optic nerves was observed at 1, 2, 3, and 4 wk after injury, and images were analyzed and axis The numbers of axons were decreased.Conclusion The number of optic axons decreased and interstitial increased after injury.The axon densities of CNTF group and SCNA group were normal at 1 week (0.10 65 ± 0. 0 056 μm-2 ) Were 0.59 and 0.61, respectively, while the control group was 0.55, there was significant difference between the experimental group and the control group (P <0.05), but in the 3 groups after 2 wk There was no significant difference between the time points (P> 0.05) .Conclusion The intravitreal administration of CNTF and SCNA can reduce the number of axons after optic nerve injury within 1wk.