小鼠经角膜视网膜下腔注射的方法学研究  

Methodology of trans-corneally subretinal injection in mice

作　　者：戚艳[1] 戴旭锋[1] 张华[1] 何颖[1] 庞继景[1] 

机构地区：[1]温州医科大学眼视光学院,325027

出　　处：《中华实验眼科杂志》2015年第7期600-605,共6页Chinese Journal Of Experimental Ophthalmology

基　　金：国家自然科学基金项目（g1371060）

摘　　要：背景 小鼠是眼科基因治疗、干细胞移植和眼底病研究的常用动物模型,视网膜下腔注射是上述研究中常用的实验技术,该技术的操作流程对研究的结果产生较大影响,但是目前对具体的视网膜下腔注射操作方法的介绍鲜见报道. 目的 观察小鼠经角膜视网膜下腔注射对视网膜形态和功能的影响. 方法 2月龄SPF级C57 BL/6J小鼠充分扩瞳后,在眼科专用手术显微镜下用301/2G一次性注射针头在角巩膜缘内侧穿刺小鼠右眼角膜,用带有33G平针头的微量进样器沿穿刺口进入并绕过晶状体后到达玻璃体,然后逐渐进针至视网膜下腔隙,缓慢推注1μl质量分数0.1％荧光素钠生理盐水注射液.根据注射后注射液在视网膜下腔的分布范围不同将实验眼分为80％～100％范围组和50％～70％范围组,模拟操作组以相同的方向进针至视网膜下腔但不注射溶液,小鼠的对侧眼（右眼）作为正常对照组,每组4只眼.分别于注射后1、2、3d及注射后5周光学相干断层扫描（OCT）法观察各组小鼠视网膜的形态结构变化;于注射后5周时记录各组小鼠的视网膜电图（ERG）,然后制备小鼠视网膜石蜡切片,采用苏木精-伊红染色观察各组小鼠视网膜的组织病理学改变. 结果 注射眼注射后视网膜绿色荧光范围＞50％且无明显并发症者为注射成功,成功率＞70％.OCT观察显示,注射后1d可见注射区域视网膜神经层与视网膜色素上皮（RPE）层脱离,局部视网膜隆起,注射后2d注射区域视网膜复位.注射后5周,模拟操作组、50％～ 70％范围组、80％～100％范围组和正常对照组小鼠ERG b波振幅分别为（386.25±37.88）、（357.50±41.03）、（324.25±53.45）和（410.50±14.88） μV,4个组间总体比较差异有统计学意义（F=3.574,P=0.047）,正常对照组ERG b波振幅明显高于80％ ～ 100％范围组（均P＜0.05）.组织病理学检查显示,模拟操作组、50％～ 70％范Background Trans-corneally subretinal injection in rodent model is a useful method for genetic therapy,stem cell transplantation and the study on the ophthalmic research.Standarized operation process is critical for the successful treatment.However,there is no literature to report the detailed procedure and the influence of this technique on morphology and function of retina.Objective This sudy was to introduce a method of trans-corneally subretinal injection and evaluate its influence on the morphology and function of retina.Methods Trans-corneallly subretinal injection was performed on the left eyes of 2-month-old SPF C57BL/6J mice after dilation of pupils.A 301/2G disposable needle was used to puncture the cornea within the pupil area near limbus and avoid touching the lens and irises under eye surgery microscope.Then,a 33G blunt needle was used to insert into the vitreous and toward subretinal space via corneal puncture.Normal saline with 0.1% fluorescein sodium of 1 μl was slowly injected into the space,and 2.5% hydroxypropyl methylcellulose was dropped on ocular surface for the observation of the fundus clearly.According to the percentage of the retina filled with subretinally injected solution,the experimental eyes were divided into 80%-100% area group,50%-70% area group after injection,and the mice in the pseudo-injected group,in which injection procedure stopped just before the solution was pushed in to the subretinal space did not inject any solution after punctured.The right uninjected eyes of the mice served as normal control group.Four eyes were selected for each group.The structural changes were evaluated by optical coherance tomograpby （OCT） 1 day,2 days,3 days and 5 weeks after injection,and retinal function was assessed by the recored of electroretinography （ERG） 5 weeks after injection.The retinal sepcimens were prepared to examin the morphological changes by hematoxylin and esosin staning.The use of care followd the Regulations for the Administration of Affair Concerning Experimental A

关 键 词：注射/方法学 眼科手术技术/方法 视网膜/病理 体层摄影术/光学相干性 视网膜电图 近交系C57BL小鼠 

分 类 号：R77[医药卫生—眼科]