基因重组碱性成纤维细胞生长因子对大鼠视网膜神经节细胞的影响

Effects of recombinant basic fibroblast growth factor on retinal ganglion cells of rats

目的 :研究基因重组碱性成纤维细胞生长因子 (rbFGF)对大鼠视网膜神经节细胞 (RGCs)的影响。方法 :大鼠在视神经部分损伤后 ,球后注射生理盐水、维生素B12 、rbFGF ,伤后 4周进行轴突定量、视网膜神经节细胞定量以及RGCs凋亡的检测 ,观察视神经损伤修复情况。结果 :伤后 4周时 ,生理盐水和维生素B12 对RGCs无挽救作用 ,80 0U、160 0U和 2 4 0 0U的rbFGF对RGCs挽救率分别为 2 4 5 %、2 7 3 %、2 8 5 % ,80 0UrbFGF组、160 0UrbFGF组和2 4 0 0UrbFGF组未发生溃变的轴突数分别是损伤未治疗组的 2 0 3、2 4 3、2 3 1倍。流式细胞仪检测结果显示 :rbFGF治疗 7d后 ,RGCs凋亡率显著减少。结论 :rbFGF可提高视网膜神经节细胞的存活率 ,减少轴突溃变 ,有抗凋亡作用 。

AIM: To investigate the pharmacological effects of recombined basic fibroblast growth factor (rbFGF) on retinal ganglion cells (RGCs) of rats. METHODS: Using calibrated cross-action forceps a moderate crush injury was inflicted on the nerve. After crush injury, rbFGF, saline and VB 12 were administered by retrobublar injection. Four weeks after injury , the apoptosis of RGCs was measured with flow cytometer. RESULTS: Four weeks after operation, it was shown that the rbFGF, but not saline or VB 12 injection could significantly improve the maintainance of RGCs of rats. After 800 U, 1600 U and 2400 U rbFGF injection, the injured RGCs were rescued by 24.5%, 27.3% and 28.5% respectively. Furthermore, it was also found that rbFGF injection could effectively prevent the axons from injury. The flow cytometer showed that the rate of apoptosis was reduced markedly on 7 days at rbFGF group. CONCLUSION: rbFGF can significantly promote the functional repair of injured optic nerve. [