目的研究遗传性视网膜色素变性大鼠(Royal College of Surgeon’s rat,RCS rat)在视网膜变性发展过程中是否有内源性视网膜干细胞(retinal stem cells,RSCs)激活。方法RCS-p+(视网膜含色素的变性大鼠)按出生后视网膜变性的发展状况分为...目的研究遗传性视网膜色素变性大鼠(Royal College of Surgeon’s rat,RCS rat)在视网膜变性发展过程中是否有内源性视网膜干细胞(retinal stem cells,RSCs)激活。方法RCS-p+(视网膜含色素的变性大鼠)按出生后视网膜变性的发展状况分为变性早期(RCS15d)、中期(RCS30d)、晚期(RCS90d)3个时相点,分别采用相应时期的RCS-rdy+p+(视网膜含色素的正常大鼠)作为对照组(control groups,C15d,C30d,C90d),每组4只8眼,对各组视网膜切片进行免疫荧光组织化学(抗Chx10)实验,以鉴定视网膜干细胞;进一步采用Western blot检测各组视网膜神经上皮总蛋白中Chx10表达。结果①各正常组及变性15d大鼠视网膜各层抗Chx10免疫荧光检测均为阴性,变性中、晚期视网膜光感受细胞层部位Chx10免疫荧光阳性;②Western blot检测各变性组视网膜神经上皮总蛋白中Chx10均有表达,但变性中期Chx10表达显著高于早期和晚期(P<0.05)。结论RCS大鼠变性过程中视网膜感光细胞层出现视网膜干细胞激活。展开更多
The overall cellular gene expression is well realized by the coordinated regulation between nuclear DNA and mitochondria DNA. Coordinated regulation between two genomes plays a key role not only in mitochondria biogen...The overall cellular gene expression is well realized by the coordinated regulation between nuclear DNA and mitochondria DNA. Coordinated regulation between two genomes plays a key role not only in mitochondria biogenesis and protein synthesis but also more importantly in the regulation of gene expression of mitochondria respiratory chain subunits in order to mediate the mitochondrial respiratory function. In the present review, we focus on the mechanism of coordinated regulation between two genomes.展开更多
目的寻找一种适合于遗传性视网膜色素变性的动物模型皇家外科学院大鼠(royal college of surgeons rat,RCS)眼球冰冻切片前的固定方法。方法 RCS大鼠5只,麻醉灌注后,5只眼行4%多聚甲醛固定1 h,30%蔗糖脱水过夜;5只眼用福尔马林、酒精、...目的寻找一种适合于遗传性视网膜色素变性的动物模型皇家外科学院大鼠(royal college of surgeons rat,RCS)眼球冰冻切片前的固定方法。方法 RCS大鼠5只,麻醉灌注后,5只眼行4%多聚甲醛固定1 h,30%蔗糖脱水过夜;5只眼用福尔马林、酒精、冰醋酸混合固定液(Davidson’s Fluid)固定12h后,以5%、10%、20%、30%蔗糖进行梯度脱水各4 h;再行眼杯OCT包埋后冰冻切片。结果 Davidson’s固定后的视网膜组织结构清晰,视网膜各层结构内的细胞排列紧密,无明显裂隙存在,且发生人为视网膜脱离概率低,无自发荧光干扰;相反,采用4%多聚甲醛固定的视网膜组织各层细胞排列较疏松,有一定的裂隙或空泡存在。结论 Davidson’s固定液适用于RCS大鼠视网膜组织的固定,效果优于单纯的4%多聚甲醛固定液。展开更多
文摘The overall cellular gene expression is well realized by the coordinated regulation between nuclear DNA and mitochondria DNA. Coordinated regulation between two genomes plays a key role not only in mitochondria biogenesis and protein synthesis but also more importantly in the regulation of gene expression of mitochondria respiratory chain subunits in order to mediate the mitochondrial respiratory function. In the present review, we focus on the mechanism of coordinated regulation between two genomes.