LCRG1基因(laryngeal carcinoma related gene1,LCRG1)是一个新的喉癌候选抑瘤基因,其转录调控机制一直未被阐明.通过限制性内切酶酶切介导对LCRG1基因(-169～+127)区域进行剪切体分析,将LCRG1基因最小启动子定位于-169～-57.应用连接...LCRG1基因(laryngeal carcinoma related gene1,LCRG1)是一个新的喉癌候选抑瘤基因,其转录调控机制一直未被阐明.通过限制性内切酶酶切介导对LCRG1基因(-169～+127)区域进行剪切体分析,将LCRG1基因最小启动子定位于-169～-57.应用连接体扫描突变体分析,将关键顺式作用元件确定在-137～-122.生物信息学提示该区存在SP1、E2F1/DP1、EKLF和ZF9转录因子结合位点.利用已知反式作用因子与报告基因质粒进行共转染,提示Spl为有效的反式作用因子,且能上调LCRG1基因的表达.凝胶迁移阻滞实验确定LCRG1基因关键的顺式作用元件区域具有Spl结合位点.LCRG1基因启动子-137～-122片段在该基因表达过程中可能起重要作用,为LCRG1基因功能研究提供了新的证据.展开更多
BACKGROUND Aberrant expression of stanniocalcin 2 (STC2) is implicated in colon adenocarcinoma (COAD). A previous study identified that STC2 functions as a tumor promoter to drive development of some cancers, but the ...BACKGROUND Aberrant expression of stanniocalcin 2 (STC2) is implicated in colon adenocarcinoma (COAD). A previous study identified that STC2 functions as a tumor promoter to drive development of some cancers, but the role of its overexpression in the development of COAD remains unclear. AIM To evaluate the regulation mechanism of STC2 overexpression in COAD. METHODS The expression of STC2 in COAD was assessed by TCGA COAD database and GEO (GSE50760). Methylation level of the STC2 promoter was evaluated with beta value in UALCAN platform, and the correlation between STC2 expression and survival rate was investigated with TCGA COAD. Transcription binding site prediction was conducted by TRANSFAC and LASAGNA, and a luciferase reporter system was used to identify STC2 promoter activity in several cell lines, including HEK293T, NCM460, HT29, SW480, and HCT116. Western blotting was performed to evaluate the role of Sp1 on the expression of STC2. RESULTS The central finding of this work is that STC2 is overexpressed in COAD tissues and positively correlated with poor prognosis. Importantly, the binding site of the transcription factor Sp1 is widely located in the promoter region of STC2. A luciferase reporter system was successfully constructed to analyze the transcription activity of STC2, and knocking down the expression of Sp1 significantly inhibited the transcription activity of STC2. Furthermore, inhibition of Sp1 remarkably decreased protein levels of STC2. CONCLUSION Our data provide evidence that the transcription factor Sp1 is essential for the overexpression of STC2 in COAD through activation of promoter activity. Taken together, our finding provides new insights into the mechanism of oncogenic function of COAD by STC2.展开更多
药物诱发长QT间期综合征(long QT syndrome,LQTS)已成为临床上重要的研究课题,其中获得性长QT间期综合征(acLQTS)的发生主要是药物抑制人类ether-α-go-go相关基因(the human ether-α-go-go related gene,hERG)通道所致。hERG基因编码...药物诱发长QT间期综合征(long QT syndrome,LQTS)已成为临床上重要的研究课题,其中获得性长QT间期综合征(acLQTS)的发生主要是药物抑制人类ether-α-go-go相关基因(the human ether-α-go-go related gene,hERG)通道所致。hERG基因编码快速激活延迟整流钾离子通道(rapid component of the delayed rectifier potassium current,Ikr)的α亚基,其在动作电位3期复极过程中发挥重要作用,也是大多数抗心律失常药物作用的靶点。本文旨在探讨羟基吴茱萸次碱(hydroxyrutaecarpine,HRU)对hERG通道的影响,评估其心脏安全性。利用全细胞膜片钳技术记录HRU对hERG通道电流及动力学的影响,并验证与hERG通道的结合位点。运用PCR技术测定HRU对hERG mRNA表达水平的影响。利用Western blot技术检测HRU对hERG蛋白和转录因子Sp1(specificity protein 1)表达的影响。采用免疫荧光技术证实HRU对hERG蛋白和转录因子Sp1的定位和表达的影响。研究显示,HRU瞬时给药后对hERG电流具有抑制作用,降低hERG通道的失活电流,缩小失活时间常数,作用位点是S6片段的两个芳香族氨基酸即第656位的苯丙氨酸F656和第652位的酪氨酸Y652。HRU孵育给药能够减少hERG蛋白表达量,并抑制hERG电流,降低hERG mRNA的水平,降低细胞核内转录因子Sp1和细胞浆内hERG蛋白表达水平。激光扫描共聚焦实验也显示细胞核内转录因子Sp1和细胞浆内hERG蛋白表达都减少,说明HRU抑制Sp1表达是导致hERG mRNA表达减少的原因。以上结果表明,HRU瞬时给药抑制hERG电流的作用是通过结合hERG通道内F656和Y652位点,缩小失活时间常数,加快通道失活,从而抑制hERG通道功能。此外,HRU还抑制hERG蛋白表达,主要是通过抑制转录因子Sp1的表达,使hERG通道蛋白的转录功能下调,最终导致hERG蛋白减少。展开更多
文摘LCRG1基因(laryngeal carcinoma related gene1,LCRG1)是一个新的喉癌候选抑瘤基因,其转录调控机制一直未被阐明.通过限制性内切酶酶切介导对LCRG1基因(-169～+127)区域进行剪切体分析,将LCRG1基因最小启动子定位于-169～-57.应用连接体扫描突变体分析,将关键顺式作用元件确定在-137～-122.生物信息学提示该区存在SP1、E2F1/DP1、EKLF和ZF9转录因子结合位点.利用已知反式作用因子与报告基因质粒进行共转染,提示Spl为有效的反式作用因子,且能上调LCRG1基因的表达.凝胶迁移阻滞实验确定LCRG1基因关键的顺式作用元件区域具有Spl结合位点.LCRG1基因启动子-137～-122片段在该基因表达过程中可能起重要作用,为LCRG1基因功能研究提供了新的证据.
基金the Natural Science Foundation of Liaoning Province,China,No.20180550769
文摘BACKGROUND Aberrant expression of stanniocalcin 2 (STC2) is implicated in colon adenocarcinoma (COAD). A previous study identified that STC2 functions as a tumor promoter to drive development of some cancers, but the role of its overexpression in the development of COAD remains unclear. AIM To evaluate the regulation mechanism of STC2 overexpression in COAD. METHODS The expression of STC2 in COAD was assessed by TCGA COAD database and GEO (GSE50760). Methylation level of the STC2 promoter was evaluated with beta value in UALCAN platform, and the correlation between STC2 expression and survival rate was investigated with TCGA COAD. Transcription binding site prediction was conducted by TRANSFAC and LASAGNA, and a luciferase reporter system was used to identify STC2 promoter activity in several cell lines, including HEK293T, NCM460, HT29, SW480, and HCT116. Western blotting was performed to evaluate the role of Sp1 on the expression of STC2. RESULTS The central finding of this work is that STC2 is overexpressed in COAD tissues and positively correlated with poor prognosis. Importantly, the binding site of the transcription factor Sp1 is widely located in the promoter region of STC2. A luciferase reporter system was successfully constructed to analyze the transcription activity of STC2, and knocking down the expression of Sp1 significantly inhibited the transcription activity of STC2. Furthermore, inhibition of Sp1 remarkably decreased protein levels of STC2. CONCLUSION Our data provide evidence that the transcription factor Sp1 is essential for the overexpression of STC2 in COAD through activation of promoter activity. Taken together, our finding provides new insights into the mechanism of oncogenic function of COAD by STC2.
文摘药物诱发长QT间期综合征(long QT syndrome,LQTS)已成为临床上重要的研究课题,其中获得性长QT间期综合征(acLQTS)的发生主要是药物抑制人类ether-α-go-go相关基因(the human ether-α-go-go related gene,hERG)通道所致。hERG基因编码快速激活延迟整流钾离子通道(rapid component of the delayed rectifier potassium current,Ikr)的α亚基,其在动作电位3期复极过程中发挥重要作用,也是大多数抗心律失常药物作用的靶点。本文旨在探讨羟基吴茱萸次碱(hydroxyrutaecarpine,HRU)对hERG通道的影响,评估其心脏安全性。利用全细胞膜片钳技术记录HRU对hERG通道电流及动力学的影响,并验证与hERG通道的结合位点。运用PCR技术测定HRU对hERG mRNA表达水平的影响。利用Western blot技术检测HRU对hERG蛋白和转录因子Sp1(specificity protein 1)表达的影响。采用免疫荧光技术证实HRU对hERG蛋白和转录因子Sp1的定位和表达的影响。研究显示,HRU瞬时给药后对hERG电流具有抑制作用,降低hERG通道的失活电流,缩小失活时间常数,作用位点是S6片段的两个芳香族氨基酸即第656位的苯丙氨酸F656和第652位的酪氨酸Y652。HRU孵育给药能够减少hERG蛋白表达量,并抑制hERG电流,降低hERG mRNA的水平,降低细胞核内转录因子Sp1和细胞浆内hERG蛋白表达水平。激光扫描共聚焦实验也显示细胞核内转录因子Sp1和细胞浆内hERG蛋白表达都减少,说明HRU抑制Sp1表达是导致hERG mRNA表达减少的原因。以上结果表明,HRU瞬时给药抑制hERG电流的作用是通过结合hERG通道内F656和Y652位点,缩小失活时间常数,加快通道失活,从而抑制hERG通道功能。此外,HRU还抑制hERG蛋白表达,主要是通过抑制转录因子Sp1的表达,使hERG通道蛋白的转录功能下调,最终导致hERG蛋白减少。
