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半乳糖诱导大鼠晶状体上皮细胞凋亡与白内障形成的关系
Relationship between galactose-induced apoptosis of lens epithelial cells and cataractogenesis
【摘要】 目的研究半乳糖对大鼠晶状体上皮细胞凋亡的影响,并探讨细胞凋亡与白内障形成的关系。方法将半乳糖单侧眼球后注射W istar大鼠,裂隙灯下观察晶状体混浊情况,运用流式细胞仪检测各组晶状体上皮细胞C-MYC水平,用末端标记(Tunel)法检测细胞凋亡。结果半乳糖诱导第7天半数以上晶状体混浊度为Ⅱ期,至14 d时87%晶状体混浊度为Ⅳ~Ⅴ期,在第24天时100%晶状体混浊度Ⅳ~Ⅴ期;乳糖诱导第7天细胞凋亡率为5.6%~8.4%,从第7天开始凋亡细胞数逐渐增多,第14天时细胞凋亡率达30.2%~41.8%,第24天时镜下最多可观察到60%的凋亡细胞;晶状体上皮细胞C-MYC水平在半乳糖诱导第7天和14天均高于对照组(P<0.05),24 d接近正常水平。结论半乳糖诱导大鼠白内障形成过程中出现晶状体上皮细胞的凋亡,其机制可能与半乳糖诱导晶状体上皮细胞C-MYC高表达有关。
【Abstract】 Objective To explore the relationship between galactose-induced apoptosis of lens epithelial cells and cataractogenesis.Methods Galactose was injected retrobulbarly into Wistar rats.The opacity of lens was examined by slit lamp.The expression of C-MYC was measured by flow cytometer.The apoptosis of lens epithelial cells was observed by TUNEL techniques.Results More than 50 percent of lenses were in the Ⅱ stage of cataractogenesis on the(7 d) after galactose induction;Eighty-seven percent of lenses were in the Ⅳ-Ⅴ stage on the(14 d),and 100 percent of lenses were in the Ⅳ-Ⅴ stage on the(24 d).The rate of apoptotic cell on the(7 d) and on the(14 d) after galactose induction was respectively 5.6%~8.4% and 30.2%~41.8%,and 60% apoptotic cells were observed on the(24 d).The levels of C-MYC expression in lens epithelial cells induced by galactose on the(7 d) and(14 d) were higher than that of normal lenses,but the level of C-MYC expression backed to normal level on the(24 d).Conclusion It was suggested that there are some apoptosis of the lens epithelial cells during galactose-induced cataractogenesis and that the apoptosis of the lens epithelial cells might be caused by higher expression of C-MYC.
【Key words】 cataract; lens epithelial cell; apoptosis; C-MYC; galactose;
- 【文献出处】 基础医学与临床 ,Basic & Clinical Medicine , 编辑部邮箱 ,2006年08期
- 【分类号】R776.1
- 【被引频次】17
- 【下载频次】143