摘要
目的 观察早期糖尿病大鼠视网膜上存留的视网膜神经节细胞（RGC） 树突和胞体形态改变。方法 用基因枪技术标记病程3个月的糖尿病大鼠和正常同龄大鼠的RGC，用带Z轴的Leica显微镜和CCD照相机采集RGC照片，按树突和胞体大小及形态分类后比较各组细胞树突野、胞体直径变化及其结构特征变异。Thy-1抗体免疫标记RGC，荧光显微镜下拍照，计数比较早期糖尿病大鼠RGC密度变化。结果 病程3个月时，糖尿病大鼠RGC密度明显下降，被基因枪标记的RGC出现明显的树突野变化。各类细胞树突主干没有很大的变异，部分RGC表现出局部树突的短缩破坏，部分RGC细胞表现为树突小分支稀疏或扭曲变形。糖尿病大鼠A类RGC的树突野直径均值为（401±86） μm,对照组大鼠A类RGC的树突野直径均值为（315±72） μm,二者比较，差异有统计学意义（t=21.249，P〈0.001）；糖尿病大鼠A类RGC的胞体直径均值为（24±6） μm, 对照组大鼠A类RGC的胞体直径均值为（22±5） μm,二者比较，差异无统计学意义（t=0.927，P〉0.05）。B类RGC树突野与胞体直径均值在糖尿病大鼠分别为（170±36）、（14±2） μm，在对照组大鼠分别为（165±36）、（16±2） μm； C类 RGC树突野与胞体直径均值在糖尿病大鼠分别为（265±78）、（17±5） μm，在对照组大鼠分别为（251±57）、（17±4） μm，两两比较，其差异均无统计学意义（t= 1.357，0.798，0.835，1.104，P〉0.05）。结论 糖尿病早期大鼠RGC树突具有相当的可塑性，尤其是A类细胞。树突形态变化比胞体更敏感，可作为早期RGC形态变化的重要指标。糖尿病成年动物RGC表现出良好的可塑性及从树突变化到细胞真正死亡之间存在的时间窗为我们研究及临床开展神经保护提供了依据。
Objective To observe the morphological changes of dendrite and soma in retinal ganglion cells （RGCs） which subsisted in early diabetic rats. Methods The RGCs of 3-months-course diabetic rats and coeval normal rats were marked by gene gun techniques. To collect RGCs photographs by Leica microscope with Z axis and CCD camera;to observe the changes of diameter, variance of structural features in dendritic field and somata after classification which according to the size and morphology. Thy-1 antibody marks on the retinal RGCs, taking a photograph under fluorescent microscope, counting the changes of retinal RGCs density in early diabetic rat. Results In three-month diabetic rats,the density of retinal RGCs was decreased obviously. Morphological changes of RGCs in the dendritic fields were observed with gene gun technique. There was no severe variation in all kinds of the bole of cell dendrite, in which some only showed crispation partially and sparseness also twisting in the dendritic ramus. The mean diameter of dendritic field and soma in class A of diabetic rats was （401±86） μm, the mean diameter of dendritic field in control group was （315±72） μm,compared with each other, there is statistically significant differences （t=21.249,P〈0.001）; the mean diameter of soma in class A of diabetic rats was （24±6） μm, the mean diameter of soma in control group was （22±5） μm, compared with each other, there is no statistically significant differences （t=0.927,P〉0.05）; the mean diameter of dendritic field and soma in class B of diabetic rats were （170±36）、（14±2） μm respectively, in control group were （165±36）、（16±2） μm, the mean diameter of dendritic field and soma in class C of diabetic group were（265±78）、（17±5） μm respectively, in control group were （251±57）、（17±4） μm , compared with each other, there are on statistically significant differences（t=1.357,0.798,0.835,1.104,P〉0.05）. Conclusions In short-term diabetes, the survived R
出处
《中华眼底病杂志》
CAS
CSCD
北大核心
2008年第4期249-254,共6页
Chinese Journal of Ocular Fundus Diseases
