Objective Vascular smooth muscle cell(VSMC)differentiation from stem cells is one source of the increasing number of VSMCs that are involved in vascular remodeling-related diseases such as hypertension,atherosclerosis...Objective Vascular smooth muscle cell(VSMC)differentiation from stem cells is one source of the increasing number of VSMCs that are involved in vascular remodeling-related diseases such as hypertension,atherosclerosis,and restenosis.MicroRNA-146a(miR-146a)has been proven to be involved in cell proliferation,migration,and tumor metabolism.However,little is known about the functional role of miR-146a in VSMC differentiation from embryonic stem cells(ESCs).This study aimed to determine the role of miR-146a in VSMC differentiation from ESCs.Methods Mouse ESCs were differentiated into VSMCs,and the cell extracts were analyzed by Western blotting and RT-qPCR.In addition,luciferase reporter assays using ESCs transfected with miR-146a/mimic and plasmids were performed.Finally,C57BL/6J female mice were injected with mimic or miR-146a-overexpressing ESCs,and immunohistochemistry,Western blotting,and RT-qPCR assays were carried out on tissue samples from these mice.Results miR-146a was significantly upregulated during VSMC differentiation,accompanied with the VSMC-specific marker genes smooth muscle-alpha-actin(SMαA),smooth muscle 22(SM22),smooth muscle myosin heavy chain(SMMHC),and h1-calponin.Furthermore,overexpression of miR-146a enhanced the differentiation process in vitro and in vivo.Concurrently,the expression of Kruppel-like factor 4(KLF4),predicted as one of the top targets of miR-146a,was sharply decreased in miR-146a-overexpressing ESCs.Importantly,inhibiting KLF4 expression enhanced the VSMC-specific gene expression induced by miR-146a overexpression in differentiating ESCs.In addition,miR-146a upregulated the mRNA expression levels and transcriptional activity of VSMC differentiation-related transcription factors,including serum response factor(SRF)and myocyte enhancer factor 2c(MEF-2c).Conclusion Our data support that miR-146a promotes ESC-VSMC differentiation through regulating KLF4 and modulating the transcription factor activity of VSMCs.展开更多
目的探讨microRNA-1469(miR-1469)在肝细胞癌(HCC)中的表达及其对肝癌细胞生物学行为的影响。方法选取2010年1月至2012年12月于西安交通大学第一附属医院手术切除的HCC组织和对应的癌旁组织(距肿瘤边缘>2 cm)标本各76例,采用实时荧...目的探讨microRNA-1469(miR-1469)在肝细胞癌(HCC)中的表达及其对肝癌细胞生物学行为的影响。方法选取2010年1月至2012年12月于西安交通大学第一附属医院手术切除的HCC组织和对应的癌旁组织(距肿瘤边缘>2 cm)标本各76例,采用实时荧光定量聚合酶链反应检测HCC组织及癌旁组织中miR-1469的表达水平,分析miR-1469表达与HCC临床病理特征的关系,Kaplan-Meier生存曲线分析miR-1469表达与HCC患者3 a总体生存率的关系。采用实时荧光定量聚合酶链反应检测HCC细胞系HepG2、Hep3B、SMMC-7721、Huh7、Bel-7402及正常肝细胞系LO2中miR-1469的表达水平;培养Hep3B和SMMC-7721细胞,当细胞融合度达到70%时,分别应用miR-1469 mimics和相应的阴性对照脂质体转染Hep3B细胞,应用miR-1469 inhibitors和相应的阴性对照脂质体转染SMMC-7721细胞。转染48 h后,采用实时荧光定量聚合酶链反应检测各组细胞中miR-1469的表达水平,采用四甲基偶氮唑盐(MTT)法和平板克隆形成实验观察miR-1469对Hep3B和SMMC-7721细胞增殖及克隆形成能力的影响,流式细胞术检测miR-1469对Hep3B和SMMC-7721细胞周期的影响,Transwell实验观察miR-1469对Hep3B和SMMC-7721细胞侵袭及迁移能力的影响,Western blot法检测Hep3B和SMMC-7721细胞中NDRG1蛋白表达。结果miR-1469在HCC组织和癌旁组织中的相对表达量分别为0.71±0.03、5.49±0.04,HCC组织中miR-1469相对表达量显著低于癌旁组织( P <0.05)。miR-1469表达与肿瘤直径、肿瘤数目、TNM分期、组织分化程度及微血管侵犯相关( P <0.05),而与患者的年龄、性别、血清甲胎蛋白水平、静脉侵犯、Edmondson病理分级、肿瘤部位无相关性( P >0.05)。Kaplan-Meier生存分析显示,miR-1469高表达HCC患者的3 a总体生存率显著高于低表达者( P <0.05)。miR-1469在LO2、HepG2、Hep3B、SMMC-7721、Huh7、Bel-7402细胞中的相对表达量分别为1.01±0.02、0.45±0.01、0.05±0.01、0.61±0.02、0.14±0.01、0.29±0.02;miR-1469在HepG2、Hep3B、SMMC-7721、Huh7、Bel-7402细胞中的相对表达量显著低于LO2细胞( P <0.05);其中Hep3B细胞中miR-1469表达量最低,SMMC-7721细胞中miR-1469表达量最高。miR-1469 mimics组和miR-1469 control mimics组Hep3B细胞中miR-1469相对表达量分别为4.47±0.15、0.05±0.01,miR-1469 mimics组Hep3B细胞中miR-1469相对表达量显著高于miR-1469 control mimics组( P <0.05)。miR-1469 inhibitors组和miR-1469 control inhibitors组SMMC-7721细胞中miR-1469相对表达量分别为0.20±0.11、1.00±0.00,miR-1469 inhibitors组SMMC-7721细胞中miR-1469相对表达量显著低于miR-1469 control inhibitors组( P <0.05)。MTT结果显示,培养24、48、72 h时,miR-1469 mimics组Hep3B细胞增殖能力显著低于miR-1469 control mimics组,miR-1469 inhibitors组SMMC-7721细胞增殖能力显著高于miR-1469 control inhibitors组( P <0.05)。平板克隆实验结果显示,miR-1469 mimics组和miR-1469 control mimics组Hep3B细胞的克隆数分别为17.00±1.73、65.67±2.33,miR-1469 mimics组Hep3B细胞的克隆形成能力显著低于miR-1469 control mimics组( P <0.05);miR-1469 inhibitors组和miR-1469 control inhibitors组SMMC-7721细胞的克隆数分别为93.00±2.08、27.67±1.45,miR-1469 inhibitors组SMMC-7721细胞的克隆形成能力显著高于miR-1469 control inhibitors组( P <0.05)。流式细胞术结果显示,与miR-1469 control mimics组比较,miR-1469 mimics组G 1期Hep3B细胞显著增多,S期Hep3B细胞显著减少( P <0.05),但2组G 2期细胞比例比较差异无统计学意义( P >0.05)。与miR-1469 control inhibitors组比较,miR-1469 inhibitors组G 1期SMMC-7721细胞显著减少,S期SMMC-7721细胞显著增多( P <0.05);但2组G 2期SMMC-7721细胞比例比较差异无统计学意义( P >0.05)。Transwell实验结果显示,miR-1469 mimics组Hep3B细胞迁移数和侵袭数分别为59.00±2.08、29.00±2.08,miR-1469 control mimics组Hep3B细胞迁移数和侵袭数分别为35.00±1.53、20.33±1.45;miR-1469 mimics组Hep3B细胞的迁移和侵袭能力显著高于miR-1469 control mimics组( P <0.05)。miR-1469 inhibitors组SMMC-7721细胞迁移数和侵袭数分别为26.00±1.16、17.33±0.88,miR-1469 control inhibitors组SMMC-7721细胞迁移数和侵袭数分别为56.33±3.18、44.67±1.45;miR-1469 inhibitors组SMMC-7721细胞的迁移和侵袭能力显著低于miR-1469 control inhibitors组( P <0.05)。Western blot结果显示,miR-1469 mimics组和miR-1469 control mimics组Hep3B细胞中NDRG1蛋白相对表达量分别为0.23±0.04、1.00±0.00,miR-1469 mimics组Hep3B细胞中NDRG1蛋白相对表达量显著低于miR-1469 control mimics组( P <0.05);miR-1469 inhibitors组和miR-1469 control inhibitors组SMMC-7721细胞中NDRG1蛋白相对表达量分别为3.90±0.17、1.00±0.00,miR-1469 inhibitors组SMMC-7721细胞中NDRG1蛋白相对表达量显著高于miR-1469 control inhibitors组( P <0.05)。结论 MiR-1469在HCC中表达下调,且其表达与肿瘤数目、肿瘤直径、TNM分期、组织分化程度、微血管侵犯及患者预后密切相关;miR-1469可能通过靶向结合NDRG1并抑制其表达而抑制HCC细胞的增殖、周期、侵袭和迁移。展开更多
基金funded by the National Natural Science Foundation of China(No.82070376 and No.81873491)the Natural Science Foundation of Zhejiang Province(No.LY21H020005)+1 种基金the Zhejiang Medical Science and Technology Project(No.2019KY376 and No.2018KY071)a Ningbo Science and Technology Project(No.202002N3173).
文摘Objective Vascular smooth muscle cell(VSMC)differentiation from stem cells is one source of the increasing number of VSMCs that are involved in vascular remodeling-related diseases such as hypertension,atherosclerosis,and restenosis.MicroRNA-146a(miR-146a)has been proven to be involved in cell proliferation,migration,and tumor metabolism.However,little is known about the functional role of miR-146a in VSMC differentiation from embryonic stem cells(ESCs).This study aimed to determine the role of miR-146a in VSMC differentiation from ESCs.Methods Mouse ESCs were differentiated into VSMCs,and the cell extracts were analyzed by Western blotting and RT-qPCR.In addition,luciferase reporter assays using ESCs transfected with miR-146a/mimic and plasmids were performed.Finally,C57BL/6J female mice were injected with mimic or miR-146a-overexpressing ESCs,and immunohistochemistry,Western blotting,and RT-qPCR assays were carried out on tissue samples from these mice.Results miR-146a was significantly upregulated during VSMC differentiation,accompanied with the VSMC-specific marker genes smooth muscle-alpha-actin(SMαA),smooth muscle 22(SM22),smooth muscle myosin heavy chain(SMMHC),and h1-calponin.Furthermore,overexpression of miR-146a enhanced the differentiation process in vitro and in vivo.Concurrently,the expression of Kruppel-like factor 4(KLF4),predicted as one of the top targets of miR-146a,was sharply decreased in miR-146a-overexpressing ESCs.Importantly,inhibiting KLF4 expression enhanced the VSMC-specific gene expression induced by miR-146a overexpression in differentiating ESCs.In addition,miR-146a upregulated the mRNA expression levels and transcriptional activity of VSMC differentiation-related transcription factors,including serum response factor(SRF)and myocyte enhancer factor 2c(MEF-2c).Conclusion Our data support that miR-146a promotes ESC-VSMC differentiation through regulating KLF4 and modulating the transcription factor activity of VSMCs.
文摘目的探讨microRNA-1469(miR-1469)在肝细胞癌(HCC)中的表达及其对肝癌细胞生物学行为的影响。方法选取2010年1月至2012年12月于西安交通大学第一附属医院手术切除的HCC组织和对应的癌旁组织(距肿瘤边缘>2 cm)标本各76例,采用实时荧光定量聚合酶链反应检测HCC组织及癌旁组织中miR-1469的表达水平,分析miR-1469表达与HCC临床病理特征的关系,Kaplan-Meier生存曲线分析miR-1469表达与HCC患者3 a总体生存率的关系。采用实时荧光定量聚合酶链反应检测HCC细胞系HepG2、Hep3B、SMMC-7721、Huh7、Bel-7402及正常肝细胞系LO2中miR-1469的表达水平;培养Hep3B和SMMC-7721细胞,当细胞融合度达到70%时,分别应用miR-1469 mimics和相应的阴性对照脂质体转染Hep3B细胞,应用miR-1469 inhibitors和相应的阴性对照脂质体转染SMMC-7721细胞。转染48 h后,采用实时荧光定量聚合酶链反应检测各组细胞中miR-1469的表达水平,采用四甲基偶氮唑盐(MTT)法和平板克隆形成实验观察miR-1469对Hep3B和SMMC-7721细胞增殖及克隆形成能力的影响,流式细胞术检测miR-1469对Hep3B和SMMC-7721细胞周期的影响,Transwell实验观察miR-1469对Hep3B和SMMC-7721细胞侵袭及迁移能力的影响,Western blot法检测Hep3B和SMMC-7721细胞中NDRG1蛋白表达。结果miR-1469在HCC组织和癌旁组织中的相对表达量分别为0.71±0.03、5.49±0.04,HCC组织中miR-1469相对表达量显著低于癌旁组织( P <0.05)。miR-1469表达与肿瘤直径、肿瘤数目、TNM分期、组织分化程度及微血管侵犯相关( P <0.05),而与患者的年龄、性别、血清甲胎蛋白水平、静脉侵犯、Edmondson病理分级、肿瘤部位无相关性( P >0.05)。Kaplan-Meier生存分析显示,miR-1469高表达HCC患者的3 a总体生存率显著高于低表达者( P <0.05)。miR-1469在LO2、HepG2、Hep3B、SMMC-7721、Huh7、Bel-7402细胞中的相对表达量分别为1.01±0.02、0.45±0.01、0.05±0.01、0.61±0.02、0.14±0.01、0.29±0.02;miR-1469在HepG2、Hep3B、SMMC-7721、Huh7、Bel-7402细胞中的相对表达量显著低于LO2细胞( P <0.05);其中Hep3B细胞中miR-1469表达量最低,SMMC-7721细胞中miR-1469表达量最高。miR-1469 mimics组和miR-1469 control mimics组Hep3B细胞中miR-1469相对表达量分别为4.47±0.15、0.05±0.01,miR-1469 mimics组Hep3B细胞中miR-1469相对表达量显著高于miR-1469 control mimics组( P <0.05)。miR-1469 inhibitors组和miR-1469 control inhibitors组SMMC-7721细胞中miR-1469相对表达量分别为0.20±0.11、1.00±0.00,miR-1469 inhibitors组SMMC-7721细胞中miR-1469相对表达量显著低于miR-1469 control inhibitors组( P <0.05)。MTT结果显示,培养24、48、72 h时,miR-1469 mimics组Hep3B细胞增殖能力显著低于miR-1469 control mimics组,miR-1469 inhibitors组SMMC-7721细胞增殖能力显著高于miR-1469 control inhibitors组( P <0.05)。平板克隆实验结果显示,miR-1469 mimics组和miR-1469 control mimics组Hep3B细胞的克隆数分别为17.00±1.73、65.67±2.33,miR-1469 mimics组Hep3B细胞的克隆形成能力显著低于miR-1469 control mimics组( P <0.05);miR-1469 inhibitors组和miR-1469 control inhibitors组SMMC-7721细胞的克隆数分别为93.00±2.08、27.67±1.45,miR-1469 inhibitors组SMMC-7721细胞的克隆形成能力显著高于miR-1469 control inhibitors组( P <0.05)。流式细胞术结果显示,与miR-1469 control mimics组比较,miR-1469 mimics组G 1期Hep3B细胞显著增多,S期Hep3B细胞显著减少( P <0.05),但2组G 2期细胞比例比较差异无统计学意义( P >0.05)。与miR-1469 control inhibitors组比较,miR-1469 inhibitors组G 1期SMMC-7721细胞显著减少,S期SMMC-7721细胞显著增多( P <0.05);但2组G 2期SMMC-7721细胞比例比较差异无统计学意义( P >0.05)。Transwell实验结果显示,miR-1469 mimics组Hep3B细胞迁移数和侵袭数分别为59.00±2.08、29.00±2.08,miR-1469 control mimics组Hep3B细胞迁移数和侵袭数分别为35.00±1.53、20.33±1.45;miR-1469 mimics组Hep3B细胞的迁移和侵袭能力显著高于miR-1469 control mimics组( P <0.05)。miR-1469 inhibitors组SMMC-7721细胞迁移数和侵袭数分别为26.00±1.16、17.33±0.88,miR-1469 control inhibitors组SMMC-7721细胞迁移数和侵袭数分别为56.33±3.18、44.67±1.45;miR-1469 inhibitors组SMMC-7721细胞的迁移和侵袭能力显著低于miR-1469 control inhibitors组( P <0.05)。Western blot结果显示,miR-1469 mimics组和miR-1469 control mimics组Hep3B细胞中NDRG1蛋白相对表达量分别为0.23±0.04、1.00±0.00,miR-1469 mimics组Hep3B细胞中NDRG1蛋白相对表达量显著低于miR-1469 control mimics组( P <0.05);miR-1469 inhibitors组和miR-1469 control inhibitors组SMMC-7721细胞中NDRG1蛋白相对表达量分别为3.90±0.17、1.00±0.00,miR-1469 inhibitors组SMMC-7721细胞中NDRG1蛋白相对表达量显著高于miR-1469 control inhibitors组( P <0.05)。结论 MiR-1469在HCC中表达下调,且其表达与肿瘤数目、肿瘤直径、TNM分期、组织分化程度、微血管侵犯及患者预后密切相关;miR-1469可能通过靶向结合NDRG1并抑制其表达而抑制HCC细胞的增殖、周期、侵袭和迁移。