Objective To investigate the expression of cyclin-dependent kinase 8(CDK8)in esophageal squamous cell carcinoma(ESCC)and its effect on ESCC cells,and to explore its potential molecular mechanism.Methods The expression...Objective To investigate the expression of cyclin-dependent kinase 8(CDK8)in esophageal squamous cell carcinoma(ESCC)and its effect on ESCC cells,and to explore its potential molecular mechanism.Methods The expression level of CDK8 mRNA was analyzed using UALCAN database,and then the expression level of CDK8 protein in tumor tissues of ESCC patients was detected by immunohistochemistry(IHC).Esophageal cancer cell lines Kyse-30 and Kyse-150 were stably transfected with lentivirus to achieve knockdown and overexpression of CDK8.EdU proliferation assay,cell colony formation assay,cell cycle assay,cell scratch assay and invasion assay were used to explore the effect of CDK8 protein expression level on the phenotype of ESCC cells.Subsequently,the effect of CDK8 on the growth of esophageal cancer xenografts in vitro was observed by subcutaneous tumor formation assay in mice.Finally,the expression of proliferation and metastasis related proteins was detected by Western blot.Results CDK8 showed high transcription and protein expression levels in ESCC tissues compared with normal esophageal tissues.Knockdown of CDK8 expression significantly inhibited the proliferation,migration and invasion of ESCC cells.In addition,inhibition of CDK8 expression significantly affected the JAK2/STAT3 pathway and the expression of E-cadherin/N-cadherin,while overexpression of CDK8 reversed these effects.Inhibition of STAT3 pathway reversed the promoting effect of CDK8 overexpression on ESCC cell phenotype.Conclusion CDK8 is a cancer-promoting factor of ESCC,which mediates the phosphorylation of JAK2/STAT3 and epithelial-mesenchymal transition(EMT).展开更多
文摘目的:探讨C3a受体(C3a receptor,C3aR)在人壁层肾祖细胞(CD24^(+)CD133^(+)PEC)向足细胞分化中的作用及其机制。方法:分离和培养原代人CD24^(+)CD133^(+)PEC,诱导分化为足细胞并检测C3aR在分化过程中的表达。构建C3a分泌性表达慢病毒,感染CD24^(+)CD133^(+)PEC,获得C3a过表达细胞株(C3a过表达组)。检测C3a过表达组、空载体组和未感染组细胞的活力、分化情况及E-cadherin、p-ERK1/2的表达。结果:成功分离出CD24^(+)CD133^(+)PEC并诱导其分化为表达Wilms肿瘤蛋白1(Wilms tumor protein 1,WT1)的足细胞,C3aR在分化过程中表达显著降低。C3a过表达组的细胞活力较空载体组和未感染组显著增强(P<0.01);诱导分化第2天,C3a过表达组细胞WT1的表达较空载体组和未感染组显著降低(P<0.01),E-cadherin及p-ERK1/2的表达较空载体组和未感染组显著升高(P<0.01)。结论:C3aR参与了人CD24^(+)CD133^(+)PEC向足细胞分化的过程,C3a过表达促进CD24^(+)CD133^(+)PEC的增殖并抑制其向足细胞分化,可能是通过ERK1/2信号通路发挥作用的。
文摘Objective To investigate the expression of cyclin-dependent kinase 8(CDK8)in esophageal squamous cell carcinoma(ESCC)and its effect on ESCC cells,and to explore its potential molecular mechanism.Methods The expression level of CDK8 mRNA was analyzed using UALCAN database,and then the expression level of CDK8 protein in tumor tissues of ESCC patients was detected by immunohistochemistry(IHC).Esophageal cancer cell lines Kyse-30 and Kyse-150 were stably transfected with lentivirus to achieve knockdown and overexpression of CDK8.EdU proliferation assay,cell colony formation assay,cell cycle assay,cell scratch assay and invasion assay were used to explore the effect of CDK8 protein expression level on the phenotype of ESCC cells.Subsequently,the effect of CDK8 on the growth of esophageal cancer xenografts in vitro was observed by subcutaneous tumor formation assay in mice.Finally,the expression of proliferation and metastasis related proteins was detected by Western blot.Results CDK8 showed high transcription and protein expression levels in ESCC tissues compared with normal esophageal tissues.Knockdown of CDK8 expression significantly inhibited the proliferation,migration and invasion of ESCC cells.In addition,inhibition of CDK8 expression significantly affected the JAK2/STAT3 pathway and the expression of E-cadherin/N-cadherin,while overexpression of CDK8 reversed these effects.Inhibition of STAT3 pathway reversed the promoting effect of CDK8 overexpression on ESCC cell phenotype.Conclusion CDK8 is a cancer-promoting factor of ESCC,which mediates the phosphorylation of JAK2/STAT3 and epithelial-mesenchymal transition(EMT).
