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【摘要】 目的 探讨神经干细胞 (NSCs) 移植对视神经受损SD大鼠视网膜节细胞 (RGCs) 的保护作用。 方法 将48只健康成年SD大鼠随机分为N组 (NSCs移植组) 和C组 (对照组),均使用精确校准方法在右眼造成部分视神经损伤,左眼作为正常对照。从胚胎SD大鼠海马分离NSCs,利用细胞培养和体内移植技术,将培养后的NSCs注入N 组大鼠右眼玻璃体内,C组大鼠右眼玻璃体内注入同等体积的PBS,处死前3 d在双上丘注射3%快蓝逆行标记双眼RGCs。将大鼠分别于注射NSCs或PBS后7 d、14 d、21 d、28 d处死,各分为4组,每组6只,分离视网膜置于荧光显微镜下,摄影输入计算机图像分析仪计数RGC,计算RGC标识率。另取6只健康成年SD大鼠作NSCs移植,分别于移植后7 d、28 d处死,每时间段3只,通过视网膜免疫荧光切片观察NSCs在视网膜的存活、整合情况。 结果 N组大鼠各时间段RGCs标识率与C组同时间段比较均增高,有显著性差异 (P + a( U* P' _* J4 Y1 q6 g$ y* I 【关键词】干细胞移植 视神经损伤 视网膜神经节细胞 大鼠 Sprague-Dawley & C9 [2 g5 c; G/ i" g4 R8 v Protective effect of neural stem cell transplantation on retinal ganglion cells) r' ]! E3 r+ I2 D% G. O9 P. e4 a$ \7 I
1 [& j2 x9 D" p; _8 Q/ Mof rats with optic nerve injury+ s% U: v# Q2 V
4 @6 w* P' c& b( k" t, r! ?3 P, tLIU Haoran1, YANG Changhong2, GAO Junwei1, et al 7 [) W8 I/ R- X8 ]8 o3 @# } # F+ `9 {; U1 E; Y' K9 H U+ b0 D1. Department of Neurosurgery, Xiangya Hospital of Central South University, Changsha 410008, China; 2. Department of Neurosurgery, Hospital for Guangdong Frontier General Team, Chinese People's Armed Police Forces, Shenzhen 518029, China - b+ c+ b, h# i+ C! y ^ Q- y1 B7 ~7 g$ l' @
Abstract:ObjectiveTo investigate the protective effect of neural stem cell (NSC) transplantation on retinal ganglion cells (RGCs) ofSprague-Dawley rats with optic nerve injury.MethodsForty-eight adult Sprague-Dawley rats were randomly divided into group N (NSC) and group C (control). Optic nerve crush injury was induced in the right eyes by a calibrated method, and the left eyes served as the normal control. NSCs were taken from embryonic SD rat hippocampus and cultured in vitro and grafted in vivo. NSCs were injected into the vitreous body of right eyes of rats in group N. Rats in group C were injected with isovolumetric PBS. Three days before sacrifice, 3% fast blue was injected into the superior colliculi bilaterally. According to the time interval between the optic nerve crush and sacrifice, both group N and C were divided respectively into four subgroups (day 7, day 14, day 21 and day 28) with 6 rats in each one. The eyes were enucleated after the rat was sacrificed, and flat mounts of the retina from both eyes were observed under a fluorescence microscope. The labeled RGCs were counted by a computerized image analyzer. The label rate of RGCs was calculated for statistical analysis. In addition, 6 adult SD rats were treated as group N, and sacrificed on days 7 and 28 after transplantation with 3 rats each time. Survival and integration of grafted NSCs in the retina of the host animals were detected by the immunofluorescence technique.ResultsThe label rate of RGCs in group N was significantly higher than that in group C at each time period (P8 L' x( Z' Y& ?6 p$ }5 y
( x7 c6 {2 R: j, W" W; DKey words:stem cell transplantation;optic nerve injuries;retinal ganglion cells;rats, Sprague-Dawley) D3 S: R7 Y; l' r Y: N
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本实验取胚鼠神经干细胞 (NSCs) 体外培养后植入视神经损伤SD大鼠视网膜内,在不同时间段观察神经节细胞的变化,以探讨NSCs移植对神经节细胞修复的影响。4 @1 p; W- z. G: c7 K
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1材料与方法 ) J. G X! @& L0 v1 c" M: N( ^6 w1 t) {' {0 y. O: J p6 `4 w
1.1实验动物及分组选用48只健康成年SD大鼠,月龄2~3个月,雌雄不限,体质量300~350 g。制作视神经损伤模型后,按随机数字表法分为N组 (NSCs移植组) 和C组 (对照组),各24只,分别于注射NSCs或PBS后7 d、14 d、21 d、28 d各处死6只,作视网膜铺片及视网膜节细胞 (RGCs) 计数。另取6只SD大鼠制作视神经损伤模型后,玻璃体下腔注射定量NSCs,分别于移植后7 d、28 d各处死3只,取视网膜作免疫荧光切片。 3 w: V( A' o% ^/ p( r" d; x# T% Q; O1 l
1.2实验方法7 O& c" C, N0 J0 ^6 r
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[14] Kurimoto Y, Shibuki H, Kaneko Y, et al. Transplantation of adult rat hippocampus-derived neural stem cells into retina injured by transient ischemia [J]. Neurosci Lett, 2001; 306(1-2): 57-60.作者: 陈晴 时间: 2015-5-31 22:27