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
Laryngeal carcinoma related gene 1(LCRG1)是一个喉癌候选抑瘤基因,为进一步深入研究其转录调控机制,应用5′RACE技术确定了该基因的转录起始位点,然后在对人LCRG1基因进行生物信息学分析的基础上,通过PCR定向克隆和酶切亚克隆策略,...Laryngeal carcinoma related gene 1(LCRG1)是一个喉癌候选抑瘤基因,为进一步深入研究其转录调控机制,应用5′RACE技术确定了该基因的转录起始位点,然后在对人LCRG1基因进行生物信息学分析的基础上,通过PCR定向克隆和酶切亚克隆策略,构建了11种含不同长度LCRG1启动子荧光素酶报告基因重组体.启动子活性分析表明,-169~+127区域的启动子活性最高.研究提示,LCRG1基因转录所必需的基因启动子序列在-169~+127范围内.展开更多
目的探讨喉癌相关基因1(laryngeal cancer related gene 1,LCRG1)在喉鳞状细胞癌(laryngeal squmous cell carcinoma,LSCC)中的表达及其与临床病理特征的关系。方法采用免疫组化SP法对89例LSCC、31例喉上皮内瘤变及10例喉部息肉进行检测...目的探讨喉癌相关基因1(laryngeal cancer related gene 1,LCRG1)在喉鳞状细胞癌(laryngeal squmous cell carcinoma,LSCC)中的表达及其与临床病理特征的关系。方法采用免疫组化SP法对89例LSCC、31例喉上皮内瘤变及10例喉部息肉进行检测,观察LCRG1蛋白的表达。分析LCRG1的表达与LSCC患者性别、年龄、临床分型、组织学类型、TNM分期、肿瘤大小、淋巴结转移的关系。结果LCRG1在LSCC中的阳性率为78.65%,低于上皮内瘤变组织和喉部息肉组织(P<0.05),随着组织分化程度的增高,阳性率明显增高(P<0.05);与患者性别、年龄、临床分型、TNM分期、肿瘤大小、淋巴结转移无关。结论LCRG1蛋白在喉癌中表达的降低可能与癌变的发生有关,其表达与组织学分级相关。展开更多
Objective: To investigate whether LCRG1 (Laryngeal Carcinoma Related Gene 1) has tumor suppressor function. Methods: The recombinant plasmid pcDNA3.1(+)/LCRG1 was successfully constructed. The biological effects of LC...Objective: To investigate whether LCRG1 (Laryngeal Carcinoma Related Gene 1) has tumor suppressor function. Methods: The recombinant plasmid pcDNA3.1(+)/LCRG1 was successfully constructed. The biological effects of LCRG1 on Hep-2 cell line were studied by cell transfection, cell growth observation colony formation analysis and tumorigenicity experiments. Results: The LCRG1 gene potently inhibited tumorgenesis in vitro and in vivo, as showed by dramatic growth arrest observed in cell growth analysis and suppression of anchorage-independent growth and tumorigenicity in nude mice. Conclusion: Our results suggested that LCRG1 may be a candidate of tumor suppressor gene.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.
文摘Laryngeal carcinoma related gene 1(LCRG1)是一个喉癌候选抑瘤基因,为进一步深入研究其转录调控机制,应用5′RACE技术确定了该基因的转录起始位点,然后在对人LCRG1基因进行生物信息学分析的基础上,通过PCR定向克隆和酶切亚克隆策略,构建了11种含不同长度LCRG1启动子荧光素酶报告基因重组体.启动子活性分析表明,-169~+127区域的启动子活性最高.研究提示,LCRG1基因转录所必需的基因启动子序列在-169~+127范围内.
文摘目的探讨喉癌相关基因1(laryngeal cancer related gene 1,LCRG1)在喉鳞状细胞癌(laryngeal squmous cell carcinoma,LSCC)中的表达及其与临床病理特征的关系。方法采用免疫组化SP法对89例LSCC、31例喉上皮内瘤变及10例喉部息肉进行检测,观察LCRG1蛋白的表达。分析LCRG1的表达与LSCC患者性别、年龄、临床分型、组织学类型、TNM分期、肿瘤大小、淋巴结转移的关系。结果LCRG1在LSCC中的阳性率为78.65%,低于上皮内瘤变组织和喉部息肉组织(P<0.05),随着组织分化程度的增高,阳性率明显增高(P<0.05);与患者性别、年龄、临床分型、TNM分期、肿瘤大小、淋巴结转移无关。结论LCRG1蛋白在喉癌中表达的降低可能与癌变的发生有关,其表达与组织学分级相关。
基金This work was supported by the National Natural Science Foundation of China(No. 39900052) and a grant from the Ministry of Health of PR China (No. 98-1-118).
文摘Objective: To investigate whether LCRG1 (Laryngeal Carcinoma Related Gene 1) has tumor suppressor function. Methods: The recombinant plasmid pcDNA3.1(+)/LCRG1 was successfully constructed. The biological effects of LCRG1 on Hep-2 cell line were studied by cell transfection, cell growth observation colony formation analysis and tumorigenicity experiments. Results: The LCRG1 gene potently inhibited tumorgenesis in vitro and in vivo, as showed by dramatic growth arrest observed in cell growth analysis and suppression of anchorage-independent growth and tumorigenicity in nude mice. Conclusion: Our results suggested that LCRG1 may be a candidate of tumor suppressor gene.
基金supported by grants from RG is an awardee of The Chinese Scholarship Council(CSC)partially supported by grants from The Canadian Institutes of Health Research to JH+1 种基金The National Basic Research Program of China(2011CB9107040)The National Natural Science Foundation of China(30973289,81272971)~~