Colorectal cancer(CRC) is fourth most common cancer in men and third in women worldwide. Developing a diagnostic panel of sensitive and specific biomarkers for the early detection of CRC is recognised as to be crucial...Colorectal cancer(CRC) is fourth most common cancer in men and third in women worldwide. Developing a diagnostic panel of sensitive and specific biomarkers for the early detection of CRC is recognised as to be crucial for early initial diagnosis, which in turn leads to better long term survival. Most of the research on novel potential CRC biomarkers in the last 2 decades has been focussed on stool DNA analysis. In this paper, we describe the recent advances in non-invasive CRC screening and more specifically in molecular assays for aberrantly methylated BMP3 and NDRG4 promoter regions. In several research papers these markers showed superior rates for sensitivity and specificity in comparison to previously described assays. These tests detected the majority of adenomas ≥ 1 cm in size and the detection rates progressively increased with larger adenomas. The methylation status of the BMP3 and NDRG4 promoters demonstrated effective detection of neoplasms at all sites throughout the colon and was not affected by common clinical variables. Recently, a multitarget stool DNA test consisting of molecular assays for aberrantly methylated BMP3 and NDRG4 promoter regions, mutant KRAS and immunochemical assay for human haemoglobin has been made commercially available and is currently reimbursed in the United States. Although this is the most sensitive noninvasive CRC screening test, there is the need for further research in several areas- establishment of the best timeframe for repeated DNA stool testing; validation of the results in populations outside of North America; usefulness for surveillance and prognosis of patients; cost-effectiveness of DNA stool testing in real-life populations.展开更多
Cerebral ischemia is a major cause of mortality and long-term morbidity worldwide.NDRG4 has been shown to protect against cerebral ischemia,although the underlying mechanisms remain largely unclear.Here we found that ...Cerebral ischemia is a major cause of mortality and long-term morbidity worldwide.NDRG4 has been shown to protect against cerebral ischemia,although the underlying mechanisms remain largely unclear.Here we found that NDRG4 expression was decreased in the brain tissues of ischemia/reperfusion(IR)rats,indicating increased apoptosis rates among cerebral cells.NDRG4 restoration via an adenovirus significantly attenuated cerebral infarct sizes and impairments in IR rats.Furthermore,adenovirus-mediated NDRG4 inhibited cell apoptosis in the brains of IR rats and regulated the expression of Bcl-2,Bax,caspase-3,and c-Fos.Moreover,we found that NDRG4 increased expression of BDNF,which is strongly related to cerebral ischemia and cellular apoptosis.Altogether,our findings demonstrate that NDRG4 protects cerebral IR injury by inhibiting cell apoptosis and regulates cerebral cell apoptosis by increasing BDNF expression.These results suggest that NDRG4 may be a therapeutic target for IR treatment.展开更多
目的:研究N-MYC下游调控基因4在宫颈癌细胞中的表达及其对宫颈癌细胞增殖、凋亡及周期的影响。方法:通过荧光实时定量聚合酶链反应和免疫印迹检测HeLa细胞中NDRG4的表达,构建NDRG4稳转细胞系HeLa-NDRG4。CCK-8法检测NDRG4对Hela细胞增...目的:研究N-MYC下游调控基因4在宫颈癌细胞中的表达及其对宫颈癌细胞增殖、凋亡及周期的影响。方法:通过荧光实时定量聚合酶链反应和免疫印迹检测HeLa细胞中NDRG4的表达,构建NDRG4稳转细胞系HeLa-NDRG4。CCK-8法检测NDRG4对Hela细胞增殖的影响,流式细胞术检测NDRG4对Hela细胞凋亡及周期的影响。结果:宫颈癌细胞中NDRG4 m RNA和蛋白表达水平均较人正常宫颈内皮细胞显著降低,HeLa-NDRG4细胞的增殖能力显著低于HeLa-MOCK细胞,而凋亡能力显著高于HeLa-MOCK细胞。与HeLa-MOCK细胞相比,HeLa-NDRG4细胞周期被阻滞于G1期。HeLa-NDRG4细胞中p-Akt的蛋白水平较HeLa-MOCK细胞显著降低,而PTEN的蛋白水平较HeLa-MOCK细胞显著升高。结论 :NDRG4在宫颈癌中作为抑癌基因发挥作用。展开更多
目的探讨NDRG4甲基化检测在结直肠癌诊断中的价值。方法从84例结直肠癌手术切除癌组织、癌旁组织及其术前粪便、尿、血中提取DNA,应用巢式甲基化特异性PCR(nested methylation specific PCR,nMSP)检测结直肠癌粪便、尿、血中NDRG4基因...目的探讨NDRG4甲基化检测在结直肠癌诊断中的价值。方法从84例结直肠癌手术切除癌组织、癌旁组织及其术前粪便、尿、血中提取DNA,应用巢式甲基化特异性PCR(nested methylation specific PCR,nMSP)检测结直肠癌粪便、尿、血中NDRG4基因甲基化水平。比较结直肠癌组织和粪便、尿、血中NDRG4甲基化检测在结直肠癌诊断中的敏感性和特异性。结果在84例结直肠癌中,癌组织NDRG4检出率为81.0%,癌旁组织检出率为8.3%,敏感性为81.0%,特异性为91.7%;结直肠癌中粪便NDRG4基因甲基化的敏感性和特异性在3个微量DNA中最高,尿次之。结论结直肠癌组织NDRG4基因甲基化异常发生率高;粪便和尿中NDRG4甲基化异常可作为结直肠癌早期诊断的肿瘤标志物。展开更多
Objective:the N-myc downstream regulatory gene 4(NDRG4)is involved in cell growth,cell proliferation,cell survival and tumor invasion.In this paper,the role of NDRG4 in glioma was explored.Method:the expression of NDR...Objective:the N-myc downstream regulatory gene 4(NDRG4)is involved in cell growth,cell proliferation,cell survival and tumor invasion.In this paper,the role of NDRG4 in glioma was explored.Method:the expression of NDRG4 in glioma clinical specimens and its relationship with the prognosis of glioma patients were analyzed by the Cancer Genome Atlas(TCGA)and the Chinese Glioma Genome Atlas(CGGA),and the expression of NDRG4 protein and mRNA in glioma cell lines were tested and verified by Western blot and quantitative real-time fluorescence polymerase chain reaction(qRT-PCR).Result:it showed that the expression of NDRG4 in glioma tissues and cell lines is closely related to the prognosis of glioma patients.Conclusion:NDRG4 is a highly potential target gene for glioma therapy.展开更多
文摘Colorectal cancer(CRC) is fourth most common cancer in men and third in women worldwide. Developing a diagnostic panel of sensitive and specific biomarkers for the early detection of CRC is recognised as to be crucial for early initial diagnosis, which in turn leads to better long term survival. Most of the research on novel potential CRC biomarkers in the last 2 decades has been focussed on stool DNA analysis. In this paper, we describe the recent advances in non-invasive CRC screening and more specifically in molecular assays for aberrantly methylated BMP3 and NDRG4 promoter regions. In several research papers these markers showed superior rates for sensitivity and specificity in comparison to previously described assays. These tests detected the majority of adenomas ≥ 1 cm in size and the detection rates progressively increased with larger adenomas. The methylation status of the BMP3 and NDRG4 promoters demonstrated effective detection of neoplasms at all sites throughout the colon and was not affected by common clinical variables. Recently, a multitarget stool DNA test consisting of molecular assays for aberrantly methylated BMP3 and NDRG4 promoter regions, mutant KRAS and immunochemical assay for human haemoglobin has been made commercially available and is currently reimbursed in the United States. Although this is the most sensitive noninvasive CRC screening test, there is the need for further research in several areas- establishment of the best timeframe for repeated DNA stool testing; validation of the results in populations outside of North America; usefulness for surveillance and prognosis of patients; cost-effectiveness of DNA stool testing in real-life populations.
基金Funding:This work was supported by the National Natural Science Foundation of China[No.81271306].
文摘Cerebral ischemia is a major cause of mortality and long-term morbidity worldwide.NDRG4 has been shown to protect against cerebral ischemia,although the underlying mechanisms remain largely unclear.Here we found that NDRG4 expression was decreased in the brain tissues of ischemia/reperfusion(IR)rats,indicating increased apoptosis rates among cerebral cells.NDRG4 restoration via an adenovirus significantly attenuated cerebral infarct sizes and impairments in IR rats.Furthermore,adenovirus-mediated NDRG4 inhibited cell apoptosis in the brains of IR rats and regulated the expression of Bcl-2,Bax,caspase-3,and c-Fos.Moreover,we found that NDRG4 increased expression of BDNF,which is strongly related to cerebral ischemia and cellular apoptosis.Altogether,our findings demonstrate that NDRG4 protects cerebral IR injury by inhibiting cell apoptosis and regulates cerebral cell apoptosis by increasing BDNF expression.These results suggest that NDRG4 may be a therapeutic target for IR treatment.
文摘目的:研究N-MYC下游调控基因4在宫颈癌细胞中的表达及其对宫颈癌细胞增殖、凋亡及周期的影响。方法:通过荧光实时定量聚合酶链反应和免疫印迹检测HeLa细胞中NDRG4的表达,构建NDRG4稳转细胞系HeLa-NDRG4。CCK-8法检测NDRG4对Hela细胞增殖的影响,流式细胞术检测NDRG4对Hela细胞凋亡及周期的影响。结果:宫颈癌细胞中NDRG4 m RNA和蛋白表达水平均较人正常宫颈内皮细胞显著降低,HeLa-NDRG4细胞的增殖能力显著低于HeLa-MOCK细胞,而凋亡能力显著高于HeLa-MOCK细胞。与HeLa-MOCK细胞相比,HeLa-NDRG4细胞周期被阻滞于G1期。HeLa-NDRG4细胞中p-Akt的蛋白水平较HeLa-MOCK细胞显著降低,而PTEN的蛋白水平较HeLa-MOCK细胞显著升高。结论 :NDRG4在宫颈癌中作为抑癌基因发挥作用。
文摘目的探讨NDRG4甲基化检测在结直肠癌诊断中的价值。方法从84例结直肠癌手术切除癌组织、癌旁组织及其术前粪便、尿、血中提取DNA,应用巢式甲基化特异性PCR(nested methylation specific PCR,nMSP)检测结直肠癌粪便、尿、血中NDRG4基因甲基化水平。比较结直肠癌组织和粪便、尿、血中NDRG4甲基化检测在结直肠癌诊断中的敏感性和特异性。结果在84例结直肠癌中,癌组织NDRG4检出率为81.0%,癌旁组织检出率为8.3%,敏感性为81.0%,特异性为91.7%;结直肠癌中粪便NDRG4基因甲基化的敏感性和特异性在3个微量DNA中最高,尿次之。结论结直肠癌组织NDRG4基因甲基化异常发生率高;粪便和尿中NDRG4甲基化异常可作为结直肠癌早期诊断的肿瘤标志物。
文摘Objective:the N-myc downstream regulatory gene 4(NDRG4)is involved in cell growth,cell proliferation,cell survival and tumor invasion.In this paper,the role of NDRG4 in glioma was explored.Method:the expression of NDRG4 in glioma clinical specimens and its relationship with the prognosis of glioma patients were analyzed by the Cancer Genome Atlas(TCGA)and the Chinese Glioma Genome Atlas(CGGA),and the expression of NDRG4 protein and mRNA in glioma cell lines were tested and verified by Western blot and quantitative real-time fluorescence polymerase chain reaction(qRT-PCR).Result:it showed that the expression of NDRG4 in glioma tissues and cell lines is closely related to the prognosis of glioma patients.Conclusion:NDRG4 is a highly potential target gene for glioma therapy.
