目的检测组蛋白甲基化转移酶2(SET and MYND domain containing 2,SMYD2)在糖尿病小鼠肾组织中的表达变化,分析其与上皮细胞⁃间充质细胞转化(epithelial⁃mesenchymal transformation,EMT)的相关性,为临床上治疗糖尿病肾病(diabetic neph...目的检测组蛋白甲基化转移酶2(SET and MYND domain containing 2,SMYD2)在糖尿病小鼠肾组织中的表达变化,分析其与上皮细胞⁃间充质细胞转化(epithelial⁃mesenchymal transformation,EMT)的相关性,为临床上治疗糖尿病肾病(diabetic nephropathy,DN)提供新的方向。方法24只雄性C57BL/6小鼠随机分为正常对照(NC)组、DM12周组、DM24周组和DM28周组,每组6只。采用腹腔注射链脲佐菌素(streptozotocin,STZ)复制DM小鼠模型,处死小鼠后收集血清和肾组织,全自动生化分析仪测血糖(BG)、血肌酐(Scr)和尿素氮(BUN);利用HE和Masson染色进行肾脏病理分析;应用Western blot方法检测α⁃平滑肌肌动蛋白(α⁃SMA)、波形蛋白(Vimentin)、SMYD2、转化生长因子⁃β1(TGF⁃β1)和E⁃钙黏素(E⁃cadherin)的表达。结果与NC组相比,DM组小鼠BG、Scr和BUN水平均明显增加(P<0.05),24周组和28周组肾组织出现明显的病理改变和纤维增生,α⁃SMA、Vimentin、SMYD2和TGF⁃β1蛋白表达增加(P<0.05),E⁃cadherin蛋白表达减少(P<0.05),其中SMYD2与E⁃cadherin的表达呈负相关,与α⁃SMA,Vimentin和TGF⁃β1的表达呈正相关。结论SMYD2在DM小鼠肾组织中表达上调,推测其可能和TGF⁃β1表达上调共同参与EMT的发生,进而参与调控DN的发生发展。展开更多
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
文摘目的检测组蛋白甲基化转移酶2(SET and MYND domain containing 2,SMYD2)在糖尿病小鼠肾组织中的表达变化,分析其与上皮细胞⁃间充质细胞转化(epithelial⁃mesenchymal transformation,EMT)的相关性,为临床上治疗糖尿病肾病(diabetic nephropathy,DN)提供新的方向。方法24只雄性C57BL/6小鼠随机分为正常对照(NC)组、DM12周组、DM24周组和DM28周组,每组6只。采用腹腔注射链脲佐菌素(streptozotocin,STZ)复制DM小鼠模型,处死小鼠后收集血清和肾组织,全自动生化分析仪测血糖(BG)、血肌酐(Scr)和尿素氮(BUN);利用HE和Masson染色进行肾脏病理分析;应用Western blot方法检测α⁃平滑肌肌动蛋白(α⁃SMA)、波形蛋白(Vimentin)、SMYD2、转化生长因子⁃β1(TGF⁃β1)和E⁃钙黏素(E⁃cadherin)的表达。结果与NC组相比,DM组小鼠BG、Scr和BUN水平均明显增加(P<0.05),24周组和28周组肾组织出现明显的病理改变和纤维增生,α⁃SMA、Vimentin、SMYD2和TGF⁃β1蛋白表达增加(P<0.05),E⁃cadherin蛋白表达减少(P<0.05),其中SMYD2与E⁃cadherin的表达呈负相关,与α⁃SMA,Vimentin和TGF⁃β1的表达呈正相关。结论SMYD2在DM小鼠肾组织中表达上调,推测其可能和TGF⁃β1表达上调共同参与EMT的发生,进而参与调控DN的发生发展。
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).