The effect of siRNA-mediated Sox4 gene silencing on Wnt/β-catenin signaling pathway of human malignant melanoma cell line A375 was investigated.Two types of dsRNA targeting Sox4 were constructed and transfected into ...The effect of siRNA-mediated Sox4 gene silencing on Wnt/β-catenin signaling pathway of human malignant melanoma cell line A375 was investigated.Two types of dsRNA targeting Sox4 were constructed and transfected into A375 cells,and untreated cells and cells transfected with scramble RNA were used as blank control and negative control respectively.The expression levels of mRNA and protein of Sox4,Wnt3a,β-catenin and Wnt/β-catenin signaling target gene Survivin were detected after real-time PCR and Western blot respectively.MTT assay was used to measure cell proliferation after Sox4 knockdown.β-catenin/TCF transcription reporter assay was used for assessing Wnt/β-catenin signaling pathway activity.Our results showed that the two types of Sox4 siRNA were transfected into A375 cells successfully.As compared with untreated cells,Sox4 siRNAs had no significant influence on Wnt3a expression,and Sox4 siRNAs led to the decrease of β-catenin at protein level.Wnt/β-catenin signaling pathway activity was inhibited significantly.As a target of Wnt/β-catenin signaling,Survivin was decreased at both mRNA and protein levels,and cell proliferation was attenuated.Our study suggests that Sox4 may play an important role in Wnt/β-catenin signaling pathway in human malignant melanoma cells by regulating β-catenin protein level,indicating that Sox4 is involved in the progression of malignant melanoma through Wnt/β-catenin signaling pathway.展开更多
The molecular basis of the carcinogenesis of hepatocellular carcinoma(HCC) has not been adequately clarified, which negatively impacts the development of targeted therapy protocols for this overwhelming neoplasia. The...The molecular basis of the carcinogenesis of hepatocellular carcinoma(HCC) has not been adequately clarified, which negatively impacts the development of targeted therapy protocols for this overwhelming neoplasia. The aberrant activation of signaling in the HCC is primarily due to the deregulated expression of the components of the Wnt-/-β-catenin. This leads to the activation of β-catenin/T-cell factor-dependent target genes that control cell proliferation, cell cycle, apoptosis, and cell motility. The deregulation of the Wnt pathway is an early event in hepatocarcinogenesis. An aggressive phenotype was associated with HCC, since this pathway is implicated in the proliferation, migration, and invasiveness of cancer cells, regarding the cell's own survival. The disruption of the signaling cascade Wnt-/-β-catenin has shown anticancer properties in HCC's clinical evaluations of therapeutic molecules targeted for blocking the Wnt signaling pathway for the treatment of HCC, and it represents a promising perspective. The key to bringing this strategy in to clinical practice is to identify new molecules that would be effective only in tumor cells with aberrant signaling β-catenin.展开更多
目的探讨头框转录因子O家族4(class O of forkhead box transcriptionfactor 4,FOXO4)对喉癌细胞增殖凋亡能力的影响。方法应用Western blot法检测喉癌组织及对应癌旁组织中FOXO4的表达水平。细胞转染FOXO4过表达载体(p-EGFP-C1/FOXO4组...目的探讨头框转录因子O家族4(class O of forkhead box transcriptionfactor 4,FOXO4)对喉癌细胞增殖凋亡能力的影响。方法应用Western blot法检测喉癌组织及对应癌旁组织中FOXO4的表达水平。细胞转染FOXO4过表达载体(p-EGFP-C1/FOXO4组)和空载体(p-EGFP-C1组),同时设置未转染组,未转染组中只加入转染试剂。Western blot法检测转染后细胞中FOXO4蛋白水平。四甲基偶氮唑蓝(MTT)检测细胞增殖,流式细胞术检测细胞凋亡,Western blot检测细胞中活化的含半胱氨酸的天冬氨酸蛋白水解酶3(Cleaved Caspase-3)、Caspase-3、活化的含半胱氨酸的天冬氨酸蛋白水解酶9(Cleaved Caspase-9)、Caspase-9、β-连环蛋白(β-catenin)、Wnt1表达水平。用Wnt/β-catenin信号通路激活剂作用于转染p-EGFP-C1/FOXO4后的喉癌细胞(激活剂组),检测细胞增殖、凋亡情况。结果 FOXO4在喉癌组织中表达水平明显低于癌旁组织(P=0.000)。p-EGFP-C1/FOXO4组细胞中FOXO4表达水平明显高于未转染组(P=0.000)。p-EGFP-C1/FOXO4组细胞存活率及β-catenin、Wnt1水平明显低于未转染组(P=0.002,P=0.004,P=0.006),细胞凋亡率及Cleaved Caspase-3、Caspase-3、Cleaved Caspase-9、C a s p a s e-9表达水平均明显高于未转染组(P=0.0 0 2,P=0.001,h P<0.05,P=0.004,j P<0.05)。Wnt/β-catenin信号通路激活剂可以部分逆转FOXO4抑增殖和促凋亡作用。结论 FOXO4能够促进人喉癌细胞凋亡,抑制喉癌细胞增殖,作用机制可能与Wnt/β-catenin信号通路有关。展开更多
目的探讨β4整合素结合蛋白ITGB4BP对Wnt/β-catenin信号通路的影响。方法将对照组空载体pCMV-3B质粒和实验组pCMV-ITGB4BP质粒分别转染至HEK293细胞中,用Western blot和激光共聚焦技术检测细胞中β-catenin含量的变化,用含TCF/LEF启动...目的探讨β4整合素结合蛋白ITGB4BP对Wnt/β-catenin信号通路的影响。方法将对照组空载体pCMV-3B质粒和实验组pCMV-ITGB4BP质粒分别转染至HEK293细胞中,用Western blot和激光共聚焦技术检测细胞中β-catenin含量的变化,用含TCF/LEF启动子的荧光素酶TOPFlash质粒和内参pRL-TK质粒共转染对照组和实验组的HEK293细胞,用荧光素酶活性分析法检测ITGB4BP转染后HEK293细胞TCF/LEF活性的变化。设不转染质粒组为正常组,对照组和实验组均分别设未加LiCl组和加LiCl组。结果 Western blot检测结果:与正常组或对照组比较,实验组细胞β-catenin表达显著减少(P<0.05)。加LiCl之后,β-catenin的表达显著增强(P<0.05),与未加有LiCl的正常组或对照组比较,加LiCl的实验组细胞内β-catenin仍有较高的表达,但差异无显著性。激光共聚焦技术观察:实验组β-catenin(绿色荧光)表达较对照组降低。加LiCl之后,β-catenin(绿色荧光)表达增强,与未加LiCl的对照组相比,加LiCl的实验组仍有较强的荧光强度。荧光素酶活性分析法检测:实验组的荧光素酶活性较对照组显著降低(P<0.05)。LiCl作用之后,Wnt/β-catenin信号通路活性明显增强(P<0.05),与未加LiCl的对照组相比,加LiCl的实验组仍有较强的荧光素酶活性(P<0.05)。结论ITGB4BP可以下调Wnt/β-catenin信号通路的活性。展开更多
Wnt信号通路在机体多种生理过程中均具有重要作用,已证明有多种蛋白质参与其调节,包括DKK(Dickkopf)家族成员。然而,DKK4在乳腺癌中的生物学功能和分子机制尚不清楚。本研究通过在线数据库TCGA(the cancer genome atlas)和UALCAN(ualcan...Wnt信号通路在机体多种生理过程中均具有重要作用,已证明有多种蛋白质参与其调节,包括DKK(Dickkopf)家族成员。然而,DKK4在乳腺癌中的生物学功能和分子机制尚不清楚。本研究通过在线数据库TCGA(the cancer genome atlas)和UALCAN(ualcan.path.uab.edu/)分析发现,DKK4在乳腺癌中的表达与其甲基化程度负相关,并影响其肿瘤分期和患者生存率。MethHC数据库分析显示,DKK4在多数乳腺癌组织中的表达低于癌旁组织。RT-PCR检测发现,DKK4在8种人乳腺癌细胞株中不表达或低表达,在2种人正常乳腺细胞中表达;qPCR分析发现,13对组织标本中有11对癌组织的表达低于癌旁组织(P<0.0001)。构建过表达DKK4的人乳腺癌细胞株MCF7和YCCB1,克隆形成的结果显示,MCF7和YCCB1稳定细胞株形成的细胞集落数量分别为对照组的28.66%和37.26%,增殖能力明显低于对照组细胞(P<0.001);Transwell实验结果显示,细胞迁移能力减弱(590 vs. 2 052;1 310 vs. 5 137,P<0.001);侵袭能力也明显减弱(220 vs. 872;2 532 vs. 5 089;P<0.001)。流式细胞仪分析发现,DKK4可将乳腺癌细胞周期阻滞于G0/G1期((57.06±0.64)%vs.(50.13±1.08)%;(51.94±0.93)%vs.(31.00±1.03)%,P<0.001),细胞凋亡率明显增高((31.55±0.77)%vs.(9.85±0.58)%;(28.19±0.99)%vs.(17.92±0.58)%,P<0.001)。进一步采用Western印迹检测结果显示,DKK4能够使细胞周期调控蛋白P53、P27、P21和细胞凋亡因子胱天蛋白酶-3、胱天蛋白酶-7、胱天蛋白酶-9表达上调。Western印迹检测过表达DKK4对Wnt/β-catenin信号通路的影响。结果表明,细胞周期蛋白D1(cyclin D1)、C-Myc蛋白、环氧合酶2 (cyclooxygenase 2,Cox 2)、C-Jun蛋白、磷酸化应激活化蛋白激酶(p-JNK)和活化的β-联蛋白(activeβ-catenin)等的表达下调,而上皮型钙黏着蛋白(E-Cadherin)表达上调。综上所述,DKK4通过负调控Wnt/β-catenin信号通路抑制乳腺癌细胞的增殖、迁移和侵袭,阻滞细胞周期,并促进其凋亡。展开更多
OBJECTIVE:To unmask the underlying mechanisms of Yisui granule(益髓颗粒,YSG)for the treatment of Myelodysplastic syndromes(MDS).METHODS:Our study used an SKM-1 mouse xenograft model of MDS to explore the anti-tumor po...OBJECTIVE:To unmask the underlying mechanisms of Yisui granule(益髓颗粒,YSG)for the treatment of Myelodysplastic syndromes(MDS).METHODS:Our study used an SKM-1 mouse xenograft model of MDS to explore the anti-tumor potential of YSG and its safety,assess its effect on overall survival(OS),and evaluate whether its mechanism is associated with the demethylation of the secreted frizzled related protein 5(s FRP5)gene and suppressing Wnt/β-catenin pathway.Bisulfite amplicon sequencing was applied to detect the level of methylation of the s FRP5 gene;western blotting,immunofluorescence staining,and real-time Polymerase Chain Reaction were performed to detect DNA methyltransferase 1(DNMT1),s FRP5,and other Wnt/β-catenin pathway-related m RNA and protein expression.RESULTS:The results showed that high-dosage YSG exerted an anti-tumor effect similar to that of decitabine,improved OS,and reduced long-term adverse effects in the long term.Mechanically,YSG reduced the expression of DNMT1 methyltransferase,decreased the methylation,and increased the expression of the Wnt/β-catenin pathway antagonist-s FRP5.Furthermore,components of the Wnt/β-catenin pathway,including Wnt3a,β-catenin,c-Myc,and cyclin D1,were down-regulated in response to YSG,suggesting that YSG could treat MDS by demethylating the s FRP5 gene and suppressing the Wnt/β-catenin pathway.CONCLUSIONS:Our findings demonstrated that YSG could be used alone or in combination with decitabine to improve outcomes in the MDS animal model,providing an alternative solution for treating MDS.展开更多
基金supported by a grant from National Natural Sciences Foundation of China (No. 81000704)
文摘The effect of siRNA-mediated Sox4 gene silencing on Wnt/β-catenin signaling pathway of human malignant melanoma cell line A375 was investigated.Two types of dsRNA targeting Sox4 were constructed and transfected into A375 cells,and untreated cells and cells transfected with scramble RNA were used as blank control and negative control respectively.The expression levels of mRNA and protein of Sox4,Wnt3a,β-catenin and Wnt/β-catenin signaling target gene Survivin were detected after real-time PCR and Western blot respectively.MTT assay was used to measure cell proliferation after Sox4 knockdown.β-catenin/TCF transcription reporter assay was used for assessing Wnt/β-catenin signaling pathway activity.Our results showed that the two types of Sox4 siRNA were transfected into A375 cells successfully.As compared with untreated cells,Sox4 siRNAs had no significant influence on Wnt3a expression,and Sox4 siRNAs led to the decrease of β-catenin at protein level.Wnt/β-catenin signaling pathway activity was inhibited significantly.As a target of Wnt/β-catenin signaling,Survivin was decreased at both mRNA and protein levels,and cell proliferation was attenuated.Our study suggests that Sox4 may play an important role in Wnt/β-catenin signaling pathway in human malignant melanoma cells by regulating β-catenin protein level,indicating that Sox4 is involved in the progression of malignant melanoma through Wnt/β-catenin signaling pathway.
文摘The molecular basis of the carcinogenesis of hepatocellular carcinoma(HCC) has not been adequately clarified, which negatively impacts the development of targeted therapy protocols for this overwhelming neoplasia. The aberrant activation of signaling in the HCC is primarily due to the deregulated expression of the components of the Wnt-/-β-catenin. This leads to the activation of β-catenin/T-cell factor-dependent target genes that control cell proliferation, cell cycle, apoptosis, and cell motility. The deregulation of the Wnt pathway is an early event in hepatocarcinogenesis. An aggressive phenotype was associated with HCC, since this pathway is implicated in the proliferation, migration, and invasiveness of cancer cells, regarding the cell's own survival. The disruption of the signaling cascade Wnt-/-β-catenin has shown anticancer properties in HCC's clinical evaluations of therapeutic molecules targeted for blocking the Wnt signaling pathway for the treatment of HCC, and it represents a promising perspective. The key to bringing this strategy in to clinical practice is to identify new molecules that would be effective only in tumor cells with aberrant signaling β-catenin.
文摘目的探讨头框转录因子O家族4(class O of forkhead box transcriptionfactor 4,FOXO4)对喉癌细胞增殖凋亡能力的影响。方法应用Western blot法检测喉癌组织及对应癌旁组织中FOXO4的表达水平。细胞转染FOXO4过表达载体(p-EGFP-C1/FOXO4组)和空载体(p-EGFP-C1组),同时设置未转染组,未转染组中只加入转染试剂。Western blot法检测转染后细胞中FOXO4蛋白水平。四甲基偶氮唑蓝(MTT)检测细胞增殖,流式细胞术检测细胞凋亡,Western blot检测细胞中活化的含半胱氨酸的天冬氨酸蛋白水解酶3(Cleaved Caspase-3)、Caspase-3、活化的含半胱氨酸的天冬氨酸蛋白水解酶9(Cleaved Caspase-9)、Caspase-9、β-连环蛋白(β-catenin)、Wnt1表达水平。用Wnt/β-catenin信号通路激活剂作用于转染p-EGFP-C1/FOXO4后的喉癌细胞(激活剂组),检测细胞增殖、凋亡情况。结果 FOXO4在喉癌组织中表达水平明显低于癌旁组织(P=0.000)。p-EGFP-C1/FOXO4组细胞中FOXO4表达水平明显高于未转染组(P=0.000)。p-EGFP-C1/FOXO4组细胞存活率及β-catenin、Wnt1水平明显低于未转染组(P=0.002,P=0.004,P=0.006),细胞凋亡率及Cleaved Caspase-3、Caspase-3、Cleaved Caspase-9、C a s p a s e-9表达水平均明显高于未转染组(P=0.0 0 2,P=0.001,h P<0.05,P=0.004,j P<0.05)。Wnt/β-catenin信号通路激活剂可以部分逆转FOXO4抑增殖和促凋亡作用。结论 FOXO4能够促进人喉癌细胞凋亡,抑制喉癌细胞增殖,作用机制可能与Wnt/β-catenin信号通路有关。
文摘目的探讨β4整合素结合蛋白ITGB4BP对Wnt/β-catenin信号通路的影响。方法将对照组空载体pCMV-3B质粒和实验组pCMV-ITGB4BP质粒分别转染至HEK293细胞中,用Western blot和激光共聚焦技术检测细胞中β-catenin含量的变化,用含TCF/LEF启动子的荧光素酶TOPFlash质粒和内参pRL-TK质粒共转染对照组和实验组的HEK293细胞,用荧光素酶活性分析法检测ITGB4BP转染后HEK293细胞TCF/LEF活性的变化。设不转染质粒组为正常组,对照组和实验组均分别设未加LiCl组和加LiCl组。结果 Western blot检测结果:与正常组或对照组比较,实验组细胞β-catenin表达显著减少(P<0.05)。加LiCl之后,β-catenin的表达显著增强(P<0.05),与未加有LiCl的正常组或对照组比较,加LiCl的实验组细胞内β-catenin仍有较高的表达,但差异无显著性。激光共聚焦技术观察:实验组β-catenin(绿色荧光)表达较对照组降低。加LiCl之后,β-catenin(绿色荧光)表达增强,与未加LiCl的对照组相比,加LiCl的实验组仍有较强的荧光强度。荧光素酶活性分析法检测:实验组的荧光素酶活性较对照组显著降低(P<0.05)。LiCl作用之后,Wnt/β-catenin信号通路活性明显增强(P<0.05),与未加LiCl的对照组相比,加LiCl的实验组仍有较强的荧光素酶活性(P<0.05)。结论ITGB4BP可以下调Wnt/β-catenin信号通路的活性。
文摘Wnt信号通路在机体多种生理过程中均具有重要作用,已证明有多种蛋白质参与其调节,包括DKK(Dickkopf)家族成员。然而,DKK4在乳腺癌中的生物学功能和分子机制尚不清楚。本研究通过在线数据库TCGA(the cancer genome atlas)和UALCAN(ualcan.path.uab.edu/)分析发现,DKK4在乳腺癌中的表达与其甲基化程度负相关,并影响其肿瘤分期和患者生存率。MethHC数据库分析显示,DKK4在多数乳腺癌组织中的表达低于癌旁组织。RT-PCR检测发现,DKK4在8种人乳腺癌细胞株中不表达或低表达,在2种人正常乳腺细胞中表达;qPCR分析发现,13对组织标本中有11对癌组织的表达低于癌旁组织(P<0.0001)。构建过表达DKK4的人乳腺癌细胞株MCF7和YCCB1,克隆形成的结果显示,MCF7和YCCB1稳定细胞株形成的细胞集落数量分别为对照组的28.66%和37.26%,增殖能力明显低于对照组细胞(P<0.001);Transwell实验结果显示,细胞迁移能力减弱(590 vs. 2 052;1 310 vs. 5 137,P<0.001);侵袭能力也明显减弱(220 vs. 872;2 532 vs. 5 089;P<0.001)。流式细胞仪分析发现,DKK4可将乳腺癌细胞周期阻滞于G0/G1期((57.06±0.64)%vs.(50.13±1.08)%;(51.94±0.93)%vs.(31.00±1.03)%,P<0.001),细胞凋亡率明显增高((31.55±0.77)%vs.(9.85±0.58)%;(28.19±0.99)%vs.(17.92±0.58)%,P<0.001)。进一步采用Western印迹检测结果显示,DKK4能够使细胞周期调控蛋白P53、P27、P21和细胞凋亡因子胱天蛋白酶-3、胱天蛋白酶-7、胱天蛋白酶-9表达上调。Western印迹检测过表达DKK4对Wnt/β-catenin信号通路的影响。结果表明,细胞周期蛋白D1(cyclin D1)、C-Myc蛋白、环氧合酶2 (cyclooxygenase 2,Cox 2)、C-Jun蛋白、磷酸化应激活化蛋白激酶(p-JNK)和活化的β-联蛋白(activeβ-catenin)等的表达下调,而上皮型钙黏着蛋白(E-Cadherin)表达上调。综上所述,DKK4通过负调控Wnt/β-catenin信号通路抑制乳腺癌细胞的增殖、迁移和侵袭,阻滞细胞周期,并促进其凋亡。
基金Clinical Translational Research of Beijing Municipal Science and Technology Commission,Administrative Commission of Zhongguancun Science Park-funded Project:Study on Mechanisms and Efficacy of Yisui granule Treating Low and Intermediate Risk of Myelodysplastic Syndromes via DNA Demethylation(No.Z211100002921018)National Natural Science Foundation of Chinafunded Projects:Study on Molecular Mechanisms of Yisui granule Treating Myelodysplastic Syndromes via Regulating DNA Methylation(No.81503575)+1 种基金Mechanism Study of Tea Polyphenols activating c GAS-STING Pathway to Inhibit Lung Adenocarcinoma Immune Escape based on Redox Balance(No.82172760)the Golden Bridge Project of Beijing Association for Science and Technology-funded Project:Study on Mechanisms of Yisui granule Treating Low and Intermediate Risk of Myelodysplastic Syndromes via DNA Demethylation(No.ZZ20059)。
文摘OBJECTIVE:To unmask the underlying mechanisms of Yisui granule(益髓颗粒,YSG)for the treatment of Myelodysplastic syndromes(MDS).METHODS:Our study used an SKM-1 mouse xenograft model of MDS to explore the anti-tumor potential of YSG and its safety,assess its effect on overall survival(OS),and evaluate whether its mechanism is associated with the demethylation of the secreted frizzled related protein 5(s FRP5)gene and suppressing Wnt/β-catenin pathway.Bisulfite amplicon sequencing was applied to detect the level of methylation of the s FRP5 gene;western blotting,immunofluorescence staining,and real-time Polymerase Chain Reaction were performed to detect DNA methyltransferase 1(DNMT1),s FRP5,and other Wnt/β-catenin pathway-related m RNA and protein expression.RESULTS:The results showed that high-dosage YSG exerted an anti-tumor effect similar to that of decitabine,improved OS,and reduced long-term adverse effects in the long term.Mechanically,YSG reduced the expression of DNMT1 methyltransferase,decreased the methylation,and increased the expression of the Wnt/β-catenin pathway antagonist-s FRP5.Furthermore,components of the Wnt/β-catenin pathway,including Wnt3a,β-catenin,c-Myc,and cyclin D1,were down-regulated in response to YSG,suggesting that YSG could treat MDS by demethylating the s FRP5 gene and suppressing the Wnt/β-catenin pathway.CONCLUSIONS:Our findings demonstrated that YSG could be used alone or in combination with decitabine to improve outcomes in the MDS animal model,providing an alternative solution for treating MDS.
