BACKGROUND Colon cancer is among the most commonly diagnosed cancers in the United States with an estimated 97220 new cases expected by the end of 2018.It affects 1.2 million people around the world and is responsible...BACKGROUND Colon cancer is among the most commonly diagnosed cancers in the United States with an estimated 97220 new cases expected by the end of 2018.It affects 1.2 million people around the world and is responsible for about 0.6 million deaths every year.Despite decline in overall incidence and mortality over the past 30 years,there continues to be an alarming rise in early-onset colon cancer cases(<50 years).Patients are often diagnosed at late stages of the disease and tend to have poor survival.We previously showed that the WNT“gatekeeper”gene,secreted frizzled-related protein 4(SFRP4),is over-expressed in early-onset colon cancer.SFRP4 is speculated to play an essential role in cancer by inhibiting the epithelial mesenchymal transition(EMT).AIM To investigate the correlation between SFRP4 expression and EMT-linked genes in colon cancer and how it affects patient survival.METHODS SFRP4 expression relative to that of EMT-linked genes and survival analysis were performed using the University of California Santa Cruz Cancer Browser interface.RESULTS SFRP4 was found to be co-expressed with the EMT-linked markers CDH2,FN1,VIM,TWIST1,TWIST2,SNAI1,SNAI2,ZEB1,ZEB2,POSTN,MMP2,MMP7,MMP9,and COL1A1.SFRP4 expression negatively correlated with the EMTlinked suppressors CLDN4,CLDN7,TJP3,MUC1,and CDH1.The expression of SFRP4 and the EMT-linked markers was higher in mesenchymal-like samples compared to epithelial-like samples which potentially implicates SFRP4-EMT mechanism in colon cancer.Additionally,patients overexpressing SFRP4 presented with poor overall survival(P=0.0293).CONCLUSION Considering the implication of SFRP4 in early-onset colon cancer,particularly in the context of EMT,tumor metastasis,and invasion,and the effect of increased expression on colon cancer patient survival,SFRP4 might be a potential biomarker for early-onset colon cancer that could be targeted for diagnosis and/or disease therapy.展开更多
目的:研究贲门腺癌(gastric cardia adenocarcinoma,GCA)中分泌型卷曲相关蛋白4(secreted frizzled related protein4,SFRP4)及SFRP5基因启动子区甲基化状态与贲门腺癌发生发展的关系。方法:采用甲基化特异性PCR(methylation specific P...目的:研究贲门腺癌(gastric cardia adenocarcinoma,GCA)中分泌型卷曲相关蛋白4(secreted frizzled related protein4,SFRP4)及SFRP5基因启动子区甲基化状态与贲门腺癌发生发展的关系。方法:采用甲基化特异性PCR(methylation specific PCR,MSP)方法检测94例GCA组织及47例相应癌旁正常组织中SFRP4和SFRP5基因的甲基化情况,并分析其与临床病理特征之间的关系。结果:94例GCA组织中SFRP4基因甲基化率为68.1%(64/94),显著高于癌旁正常组织中的甲基化发生率8.5%(4/47)(P<0.01);SFRP5基因在贲门腺癌组织中的甲基化发生率为79.8%(75/94),显著高于癌旁正常组织中的甲基化发生率12.8%(16/47)(P<0.01)。SFRP4基因在高、中分化腺癌组甲基化发生率为35%(14/40),显著低于低分化腺癌组的发生率92.6%(50/54)(P<0.01);SFRP4基因在无淋巴结转移组的甲基化发生率为60.5%(23/38),低于有淋巴结转移组73.2%(41/56),但其差异无统计学意义(P>0.05)。SFRP5基因在低分化腺癌组甲基化发生率为85.1%(46/54),高于高、中分化腺癌组甲基化发生率72.5%(29/40),但其差异无统计学意义(P>0.05);SFRP5基因甲基化发生率在无淋巴结转移组为65.8%(25/38),显著低于有淋巴结转移组89.3%(50/56)(P<0.05)。57例贲门腺癌组织中SFRP4和SFRP5基因同时发生甲基化者,高、中分化18例,低分化39例,两者间的差异具有统计学意义(P<0.05)。结论:SFRP4和SFRP5基因可能参与了贲门腺癌的发生,SFRP4,SFRP5基因的高甲基化状态与贲门腺癌的恶性行为有关。展开更多
目的探究分泌型卷曲相关蛋白4(SFRP4)在DNA错配修复(MMR)功能正常与MMR功能缺陷的Ⅱ期结肠癌中的表达及意义。方法收集新鲜的Ⅱ期结肠癌组织标本,并根据MMR状态分为pMMR和dMMR组。利用Affymetrix Human oeLncRNA基因芯片检测两组不同MM...目的探究分泌型卷曲相关蛋白4(SFRP4)在DNA错配修复(MMR)功能正常与MMR功能缺陷的Ⅱ期结肠癌中的表达及意义。方法收集新鲜的Ⅱ期结肠癌组织标本,并根据MMR状态分为pMMR和dMMR组。利用Affymetrix Human oeLncRNA基因芯片检测两组不同MMR状态结肠癌组织中差异表达的mRNA情况。通过q-PCR和Westernblot技术检测dMMR和pMMR肠癌组织、细胞株中SFRP4的表达并分析两组间表达差异情况;通过免疫组化技术检测增殖标志物Ki-67的表达并分析SFRP4与Ki-67表达的相关关系。利用HCT116细胞株,干扰SFRP4的表达,通过流式细胞术检测干扰SFRP4前与干扰后HCT116细胞株的凋亡率并分析其差异。结果 PCR和Western blot的结果提示SFRP4在dMMR状态的肠癌组织、细胞株中的表达明显高于pMMR的肠癌组织(P=0.014)、细胞株(P=0.0079),免疫组化结果提示SFRP4与Ki-67蛋白在肠癌组织的表达呈负相关关系(P=0.041)。siRNA干扰SFRP4的表达后HCT116细胞株凋亡率下降,包括早期凋亡(P=0.003)和晚期凋亡率(P=0.024)。结论 SFRP4在dMMR型肠癌表达较pMMR型表达增高,促进肠癌细胞凋亡、抑制增殖,可能有助于改善MMR缺陷型Ⅱ期肠癌预后。展开更多
分泌型卷曲相关蛋白4(secreted frizzled-related protein 4,SFRP4)是Wnt信号通路可溶解的调控子.通过高通量测序(Solexa)技术、实时定量PCR(RT-qPCR)技术对瘦肉型和脂肪型猪不同生长阶段脂肪组织、脂肪细胞中SFRP4表达规律进行研究;用...分泌型卷曲相关蛋白4(secreted frizzled-related protein 4,SFRP4)是Wnt信号通路可溶解的调控子.通过高通量测序(Solexa)技术、实时定量PCR(RT-qPCR)技术对瘦肉型和脂肪型猪不同生长阶段脂肪组织、脂肪细胞中SFRP4表达规律进行研究;用JNK信号通路特异性抑制剂SP600125处理猪原代前体脂肪细胞,研究抑制JNK信号通路对猪前体脂肪分化以及SFRP4 mRNA和蛋白表达的影响.结果显示,SFRP4在脂肪型猪脂肪组织表达量显著高于瘦肉型猪(P<0.01);不同组织检测结果发现,SFRP4广泛表达于各个组织,并高表达于脂肪组织;前体脂肪细胞向成熟脂肪细胞分化过程中SFRP4表达量逐渐升高;SP600125促进前体脂肪细胞分化,引起PPARγ、FABP4、ATGL、Perilipin的显著升高(P<0.01),而SFRP4表达被显著抑制.本研究为调控脂肪细胞分化关键基因的筛选提供新的理论参考.展开更多
基金Supported by the SAGES research grant(to Nfonsam VN)
文摘BACKGROUND Colon cancer is among the most commonly diagnosed cancers in the United States with an estimated 97220 new cases expected by the end of 2018.It affects 1.2 million people around the world and is responsible for about 0.6 million deaths every year.Despite decline in overall incidence and mortality over the past 30 years,there continues to be an alarming rise in early-onset colon cancer cases(<50 years).Patients are often diagnosed at late stages of the disease and tend to have poor survival.We previously showed that the WNT“gatekeeper”gene,secreted frizzled-related protein 4(SFRP4),is over-expressed in early-onset colon cancer.SFRP4 is speculated to play an essential role in cancer by inhibiting the epithelial mesenchymal transition(EMT).AIM To investigate the correlation between SFRP4 expression and EMT-linked genes in colon cancer and how it affects patient survival.METHODS SFRP4 expression relative to that of EMT-linked genes and survival analysis were performed using the University of California Santa Cruz Cancer Browser interface.RESULTS SFRP4 was found to be co-expressed with the EMT-linked markers CDH2,FN1,VIM,TWIST1,TWIST2,SNAI1,SNAI2,ZEB1,ZEB2,POSTN,MMP2,MMP7,MMP9,and COL1A1.SFRP4 expression negatively correlated with the EMTlinked suppressors CLDN4,CLDN7,TJP3,MUC1,and CDH1.The expression of SFRP4 and the EMT-linked markers was higher in mesenchymal-like samples compared to epithelial-like samples which potentially implicates SFRP4-EMT mechanism in colon cancer.Additionally,patients overexpressing SFRP4 presented with poor overall survival(P=0.0293).CONCLUSION Considering the implication of SFRP4 in early-onset colon cancer,particularly in the context of EMT,tumor metastasis,and invasion,and the effect of increased expression on colon cancer patient survival,SFRP4 might be a potential biomarker for early-onset colon cancer that could be targeted for diagnosis and/or disease therapy.
文摘目的:研究贲门腺癌(gastric cardia adenocarcinoma,GCA)中分泌型卷曲相关蛋白4(secreted frizzled related protein4,SFRP4)及SFRP5基因启动子区甲基化状态与贲门腺癌发生发展的关系。方法:采用甲基化特异性PCR(methylation specific PCR,MSP)方法检测94例GCA组织及47例相应癌旁正常组织中SFRP4和SFRP5基因的甲基化情况,并分析其与临床病理特征之间的关系。结果:94例GCA组织中SFRP4基因甲基化率为68.1%(64/94),显著高于癌旁正常组织中的甲基化发生率8.5%(4/47)(P<0.01);SFRP5基因在贲门腺癌组织中的甲基化发生率为79.8%(75/94),显著高于癌旁正常组织中的甲基化发生率12.8%(16/47)(P<0.01)。SFRP4基因在高、中分化腺癌组甲基化发生率为35%(14/40),显著低于低分化腺癌组的发生率92.6%(50/54)(P<0.01);SFRP4基因在无淋巴结转移组的甲基化发生率为60.5%(23/38),低于有淋巴结转移组73.2%(41/56),但其差异无统计学意义(P>0.05)。SFRP5基因在低分化腺癌组甲基化发生率为85.1%(46/54),高于高、中分化腺癌组甲基化发生率72.5%(29/40),但其差异无统计学意义(P>0.05);SFRP5基因甲基化发生率在无淋巴结转移组为65.8%(25/38),显著低于有淋巴结转移组89.3%(50/56)(P<0.05)。57例贲门腺癌组织中SFRP4和SFRP5基因同时发生甲基化者,高、中分化18例,低分化39例,两者间的差异具有统计学意义(P<0.05)。结论:SFRP4和SFRP5基因可能参与了贲门腺癌的发生,SFRP4,SFRP5基因的高甲基化状态与贲门腺癌的恶性行为有关。
文摘分泌型卷曲相关蛋白4(secreted frizzled-related protein 4,SFRP4)是Wnt信号通路可溶解的调控子.通过高通量测序(Solexa)技术、实时定量PCR(RT-qPCR)技术对瘦肉型和脂肪型猪不同生长阶段脂肪组织、脂肪细胞中SFRP4表达规律进行研究;用JNK信号通路特异性抑制剂SP600125处理猪原代前体脂肪细胞,研究抑制JNK信号通路对猪前体脂肪分化以及SFRP4 mRNA和蛋白表达的影响.结果显示,SFRP4在脂肪型猪脂肪组织表达量显著高于瘦肉型猪(P<0.01);不同组织检测结果发现,SFRP4广泛表达于各个组织,并高表达于脂肪组织;前体脂肪细胞向成熟脂肪细胞分化过程中SFRP4表达量逐渐升高;SP600125促进前体脂肪细胞分化,引起PPARγ、FABP4、ATGL、Perilipin的显著升高(P<0.01),而SFRP4表达被显著抑制.本研究为调控脂肪细胞分化关键基因的筛选提供新的理论参考.
