Yes相关蛋白在电离辐射后表皮干细胞分化中的作用

Roles of Yes-associated protein in epidermal stem cell differentiation after ionizing

目的探讨Yes相关蛋白(YAP)在电离辐射(IR)后表皮干细胞(EPSC)分化中的作用。方法①利用打孔器建立小鼠背部皮肤损伤,随后分为IR组(给予^(60)Coγ射线局部照射),对照组(不照射);照射后0,1,3,6,9和12 d收集创面皮肤组织提取RNA和蛋白,Western印迹法检测创面愈合过程中YAP蛋白变化;实时荧光定量PCR(RT-qPCR)检测创面愈合过程中Yap及其下游靶基因结缔组织生长因子(Ctgf)和富含半胱氨酸蛋白61(Cyr61)的mRNA变化。②将EPSC给予60Coγ射线照射,细胞对照组不照射;4或8 Gy剂量照射后4,12,24和36 h收集细胞提取RNA,RT-qPCR检测YAP mRNA变化。4或8 Gy剂量照射36 h收集细胞提取蛋白,Western印迹法检测YAP蛋白水平;③短发夹RNA(shRNA)构建稳定的YAP基因敲低细胞,Western印迹法验证shYAP的敲低效率;RT-qPCR检测IR后YAP敲低对K1和K10 mRNA的影响。结果①与对照组相比,IR组小鼠在创面愈合过程中YAP蛋白水平显著降低(P<0.05,P<0.01),Yap及其下游靶基因Ctgf和Cyr61的mRNA水平显著降低(P<0.05,P<0.01)。②与细胞对照组相比,IR组细胞YAP mRNA和蛋白水平显著降低(P<0.01)。③在shYAP稳转细胞中,YAP蛋白水平显著降低(P<0.01);shYAP在IR后EPSC分化标志物K1和K10的mRNA水平明显降低(P<0.01)。结论YAP调控IR后创面愈合过程中EPSC的分化。

OBJECTIVE To explore the role of Yes-associated protein(YAP)in epidermal stem cell(EPSC)differentiation after ionizing radiation(IR).METHODS①A punch was used to induce skin injuries on the back of mice.The IR group received localized irradiation with ^(60)Coγ-rays,while the normal control group did not.Samples were collected at 0,1,3,6,9,and 12 d for RNA and protein extraction.Western blotting was used to detect changes in YAP protein expressions during wound healing.Real-time quantitative polymerase chain reaction(RT-qPCR)was performed to assess the mRNA levels of Yap and its downstream target genes,connective tissue growth factor(Ctgf),and cysteine-rich protein 61(Cyr61).②EPSCs were exposed to 60Coγat a dose of 4 or 8 Gy,while the control group was not irradiated.Cells were collected to detect the levels of YAP protein via Western blotting.Cells were collected at 4,12,24,and 36 h post-IR to assess the levels of YAP mRNA by RT-qPCR.③Short hairpin RNA(shRNA)was used to establish stable YAP knockdown cell lines,and the knockdown efficiency of shYAP was verified by Western blotting.RT-qPCR was then performed to detect the impact of YAP knockdown on mRNA levels of K1 and K10 after IR.RESULTS①Compared with the control group,the YAP protein level in the IR group during wound healing was significantly reduced(P<0.05,P<0.01),so were the mRNA levels of Yap and its downstream target genes Ctgf and Cyr61(P<0.05,P<0.01).②Compared to the cell control group,the mRNA and protein levels of YAP in the IR group cells were significantly reduced(P<0.01).③In the shYAP cells,the YAP protein level was significantly reduced(P<0.01).Furthermore,the mRNA levels of K1 and K10 were significantly decreased after IR in shYAP cells(P<0.01).CONCLUSION YAP can regulate EPSC differentiation in wound healing after IR.