模拟强日光照射导致兔眼视网膜光损伤的实验研究(英文)

Experimental study on light injury of intense solar-stimulated exposure on rabbit retina

目的:探讨短时间模拟强日光照射对兔视网膜组织结构的影响及光损伤的致伤机制。方法:健康新西兰白兔25只随机分为5组,30000lux模拟日光照射兔眼15min和30min。照射后不同时间取视网膜进行光镜、透射电镜观察并对视网膜感光细胞凋亡率进行检测。结果:15min光照组2d时观察;光感受器细胞外节盘膜结构紊乱,板层结构离散,内节线粒体肿胀,部分嵴断裂;外颗粒层细胞胞浆有空泡样改变;感光细胞凋亡率为3.26%±0.98%。30min光照组2d时观察,外节盘膜结构紊乱,板层结构重度离散,内节线粒体肿胀,嵴断裂;外颗粒层细胞胞浆有空泡样改变;感光细胞凋亡率为3.63%±1.25%。30min光照组7d时观察,外节盘膜组织结构紊乱,板层结构消失,空泡化,内节线粒体肿胀,嵴断裂;外颗粒层细胞胞浆肿胀,大量空泡样改变,排列紊乱,部分胞膜破坏;感光细胞凋亡率为19.63%±1.32%。30min光照组14d时观察,外节盘膜组织结构恢复较规则,板层结构较致密,内节线粒体肿胀,嵴断裂;外颗粒层细胞胞浆肿胀减轻,排列较整齐;感光细胞凋亡率为18.98%±1.13%。结论:30000lux模拟强日光照射15min可导致兔视网膜急性光损伤,模拟强日光照射可导致视网膜感光细胞发生退行性变性,感光细胞凋亡是损伤发生的重要机制。

·AIM： To investigate the effect of retinal organizational structure on short term intense light exposure rabbit eye model and the mechanism of light injury.·METHODS： Totally 25 healthy New Zealand white rabbits were randomly divided into 5 groups. Rabbit eyes were exposed to 30000 lux simulated solar for 15 minutes and 30 minutes, Then the retinal tissue ultrastructure was observed and photoreceptor cells apoptosis at different time after exposure was detected. ·RESULTS： Examination results of 15 minutes light