【摘要】 目的 :研究神经生长因子 (NGF)对脑缺血再灌注引起的听力及耳蜗损伤的作用。方法 :本研究给实验组大鼠脑缺血再灌注前后肌注NGF ,对照组动物肌注等量生理盐水 ,于处理前后对两组的听力损失及耳蜗结构变化加以比较。结果 :缺血 30min再灌注 60min和 2 4h ,实验组的听力损失明显小于对照组 (P <0 0 1 )。耳蜗的扫描和透射电镜观察发现 ,对照组毛细胞静纤毛粘连、部分脱落 ,外毛细胞肿胀、散在性坏死缺失 ,螺旋神经节神经元变性 ,线粒体水肿、嵴断裂。实验组耳蜗Corti’s器毛细胞及螺旋神经节神经元的损伤明显轻于对照组。结论 :NGF能减轻脑缺血再灌注引起的听力及耳蜗损伤。更多还原

【Abstract】 AIM: To investigate the effect of nerve growth factor (NGF) on auditory and cochlear damage induced by brain ischemia and reperfusion. METHODS: The rats with brain ischemia and reperfusion were divided into two groups at random. In the experimental group, the rats were injected intramuscularly with NGF . In control group, the animals were injected with normal saline instead of NGF. Then the hearing loss and cochlear structural changes of rats in both groups were compared. RESULTS: It was found that the hearing loss of rats in NGF group were less significantly than that of control group ( P< 0.01) after 60 min and 24 h reperfusion following 30 min ischemia. Scanning and transmission microscopy showed that the damage of the outer hair cells and the spiral neurons of rats in NGF group was much slighter than that of control group. CONCLUSION: NGF prevents auditory and cochlear injury induced by brain ischemia and reperfusion.更多还原