Yu Yixin, Jiang Haibo, Li Haibo, Song Weitao, Xia Xiaobo
Department of Ophthalmology, Xiangya Hospital, Central South University , Changsha, Hunan Province, China .
Cell Reprogram. 2016 Oct;18(5):327-332. doi: 10.1089/cell.2016.0017.
Cataract, the leading cause of blindness worldwide, is caused by the apoptosis of lens epithelial cells (LECs). αA-crystallin is a major structural protein of the lens. However, the antiapoptotic function of αA-crystallin in lens stem cells remains unclear. In this study, primary LECs were isolated from postnatal 3-5 days of SD rats and transfected by Sendai virus loaded with four factors, OCT3/4, Sox2, c-Myc, and Klf4, to induced pluripotent stem cells (iPSCs). LEC-iPSC-like cells were identified by immunofluorescent staining. CryαA-specific shRNA lentivirus was used to knockdown αA-crystallin in LEC-derived iPSC-like cells, which were treated with tert-Butyl hydroperoxide. The apoptosis of LEC-iPSC-like cells was examined by flow cytometry. We reprogrammed LECs and obtained embryonic stem cell-like colonies. LEC-iPSC-like cells with normal karyotype expressed pluripotent markers such as SSEA-4, TRA-1-60, and TRA-1-81. Knockdown of αA-crystallin increased the apoptosis of LEC-iPSC-like cells and rendered them less resistant to oxidation stress induced by tert-Butyl hydroperoxide. In conclusion, LECs could be reprogrammed into iPSC-like cells and αA-crystallins could protect LEC-iPSC-like cells from oxidation stress-induced apoptosis.
白内障是全球失明的主要原因,由晶状体上皮细胞(LECs)的凋亡引起。αA-晶状体蛋白是晶状体的主要结构蛋白。然而,αA-晶状体蛋白在晶状体干细胞中的抗凋亡功能仍不清楚。在本研究中,从出生后3-5天的SD大鼠中分离出原代LECs,并用携带OCT3/4、Sox2、c-Myc和Klf4四种因子的仙台病毒转染,诱导其成为诱导多能干细胞(iPSCs)。通过免疫荧光染色鉴定LEC-iPSC样细胞。使用CryαA特异性shRNA慢病毒敲低LEC来源的iPSC样细胞中的αA-晶状体蛋白,并用叔丁基过氧化氢处理这些细胞。通过流式细胞术检测LEC-iPSC样细胞的凋亡。我们对LECs进行重编程并获得了胚胎干细胞样集落。具有正常核型的LEC-iPSC样细胞表达多能性标志物,如SSEA-4、TRA-1-60和TRA-1-81。敲低αA-晶状体蛋白增加了LEC-iPSC样细胞的凋亡,并使其对叔丁基过氧化氢诱导的氧化应激的抵抗力降低。总之,LECs可以重编程为iPSC样细胞,并且αA-晶状体蛋白可以保护LEC-iPSC样细胞免受氧化应激诱导的凋亡。