目的:研究小干扰RNA(small interfering R N A,s i R N A)沉默人胰腺癌Capan-2、PANC-1细胞中叉头框蛋白C1(fork head box C1,FOXC1)基因对胰腺癌细胞增殖能力的影响及作用机制.方法:以胰腺癌细胞、原发胰腺癌组织为研究对象,实时定量...目的:研究小干扰RNA(small interfering R N A,s i R N A)沉默人胰腺癌Capan-2、PANC-1细胞中叉头框蛋白C1(fork head box C1,FOXC1)基因对胰腺癌细胞增殖能力的影响及作用机制.方法:以胰腺癌细胞、原发胰腺癌组织为研究对象,实时定量逆转录聚合酶链反应(quantitative real-time reverse transcription polymerase chain reaction,q RT-PCR)检测FOXC1 m RNA在胰腺癌细胞及组织中的表达情况;将人胰腺癌细胞分为2组:FOXC1s i R N A组(实验组)、N C s i R N A组(阴性对照组),脂质体转染法将FOXC1 si RNA转染入胰腺癌细胞,q RT-PCR、Western blot技术检测胰腺癌细胞FOXC1 m RNA及蛋白表达变化,5-乙炔基-2'-脱氧尿苷(5-ethynyl-2'-deoxyuridine,Ed U)细胞增殖法检测各组胰腺癌细胞增殖情况;流式细胞技术(flow cytometry,FCM)检测各组胰腺癌细胞的周期分布,Western blot技术分析周期相关蛋白P21、P53、Cyclin D1蛋白表达情况.结果:q RT-PCR结果提示:相比正常胰腺上皮细胞和癌旁胰腺组织,FOXC1 m RNA在胰腺癌细胞及胰腺癌组织中表达较高(P<0.05);q RT-P C R及Westernblo t结果显示FOXC1 si RNA有效沉默了胰腺癌细胞F O X C1基因的转录和表达,E d U细胞增殖实验提示:沉默了胰腺癌细胞F O X C1基因表达后,胰腺癌细胞胞的增殖能力明显下降,较阴性对照组,差异有统计学意义(P<0.05);F C M结果显示:沉默了胰腺癌细胞FOXC1基因表达后胰腺癌细胞被阻滞在G0/G1期,较阴性对照组,差异有统计学意义(P<0.05);Western blot结果显示:较阴性对照组,P21、P53表达水平无明显变化,Cyclin D1表达水平下降,差异有统计学意义(P<0.05).结论:FOXC1 si RNA能够有效沉默人胰腺癌Capan-2、PANC-1细胞FOXC1基因的表达,抑制其增殖,将细胞周期阻滞于G0/G1期,提示FOXC1影响细胞增殖可能是通过调控细胞周期实现的,其机制可能是部分通过调控细胞周期蛋白Cyclin D1的表达而实现.展开更多
Objective： Axenfeld-Rieger syndrome （ARS） is phenotypically and genetically heterogeneous. In this study we identified the underlying genetic defect in a Chinese family with ARS. Methods： A detailed family history...Objective： Axenfeld-Rieger syndrome （ARS） is phenotypically and genetically heterogeneous. In this study we identified the underlying genetic defect in a Chinese family with ARS. Methods： A detailed family history and clinical data were recorded. The ocular phenotype was documented using slit-lamp photography and systemic anomalies were also documented where available. The genomic DNA was extracted from peripheral blood leukocytes. All coding exons and intron-exon junctions of paired-like homeodomain transcription factor 2 （PITX2） gene and the forkhead box C1 （FOXC1） gene were amplified by polymerase chain reaction （PCR） and screened for mutation by direct DNA sequencing. Variations detected in exon 5 of PITX2 were further evaluated with cloning sequencing. The exon 5 of PITX2 was also sequenced in 100 healthy controls, unrelated to the family, for comparison. Structural models of the wild type and mutant homeodomain of PITX2 were investigated by SWISS-MODEL. Results： Affected individuals exhibited variable ocular phenotypes, whereas the systemic anomalies were similar. After direct sequencing and cloning sequencing, a heterozygous deletion/insertion mutation c. 198_201delinsTTTCT （p.M661fs＊133） was revealed in exon 5 of PITX2. This mutation co-segregated with all affected individuals in the family and was not found either in unaffected family members or in 100 unrelated controls. Conclusions： We detected a novel frameshift mutation p.M661fs＊133 in PITX2 in a Chinese family with ARS. Although PITX2 mutations and polymorphisms have been re- ported from various ethnic groups, we report for the first time the identification of a novel deletion/insertion mutation that causes frameshift mutation in the homeodomain of PITX2 protein.展开更多
文摘目的:研究小干扰RNA(small interfering R N A,s i R N A)沉默人胰腺癌Capan-2、PANC-1细胞中叉头框蛋白C1(fork head box C1,FOXC1)基因对胰腺癌细胞增殖能力的影响及作用机制.方法:以胰腺癌细胞、原发胰腺癌组织为研究对象,实时定量逆转录聚合酶链反应(quantitative real-time reverse transcription polymerase chain reaction,q RT-PCR)检测FOXC1 m RNA在胰腺癌细胞及组织中的表达情况;将人胰腺癌细胞分为2组:FOXC1s i R N A组(实验组)、N C s i R N A组(阴性对照组),脂质体转染法将FOXC1 si RNA转染入胰腺癌细胞,q RT-PCR、Western blot技术检测胰腺癌细胞FOXC1 m RNA及蛋白表达变化,5-乙炔基-2'-脱氧尿苷(5-ethynyl-2'-deoxyuridine,Ed U)细胞增殖法检测各组胰腺癌细胞增殖情况;流式细胞技术(flow cytometry,FCM)检测各组胰腺癌细胞的周期分布,Western blot技术分析周期相关蛋白P21、P53、Cyclin D1蛋白表达情况.结果:q RT-PCR结果提示:相比正常胰腺上皮细胞和癌旁胰腺组织,FOXC1 m RNA在胰腺癌细胞及胰腺癌组织中表达较高(P<0.05);q RT-P C R及Westernblo t结果显示FOXC1 si RNA有效沉默了胰腺癌细胞F O X C1基因的转录和表达,E d U细胞增殖实验提示:沉默了胰腺癌细胞F O X C1基因表达后,胰腺癌细胞胞的增殖能力明显下降,较阴性对照组,差异有统计学意义(P<0.05);F C M结果显示:沉默了胰腺癌细胞FOXC1基因表达后胰腺癌细胞被阻滞在G0/G1期,较阴性对照组,差异有统计学意义(P<0.05);Western blot结果显示:较阴性对照组,P21、P53表达水平无明显变化,Cyclin D1表达水平下降,差异有统计学意义(P<0.05).结论:FOXC1 si RNA能够有效沉默人胰腺癌Capan-2、PANC-1细胞FOXC1基因的表达,抑制其增殖,将细胞周期阻滞于G0/G1期,提示FOXC1影响细胞增殖可能是通过调控细胞周期实现的,其机制可能是部分通过调控细胞周期蛋白Cyclin D1的表达而实现.
基金Project supported by the Qianjiang Talents Project of Zhejiang Province(No.2010R10067)the Zhejiang Key Innovation Team Project of China(No.2009R50039)the Zhejiang Key Laboratory Foundation of China(No.2011E10006)
文摘Objective： Axenfeld-Rieger syndrome （ARS） is phenotypically and genetically heterogeneous. In this study we identified the underlying genetic defect in a Chinese family with ARS. Methods： A detailed family history and clinical data were recorded. The ocular phenotype was documented using slit-lamp photography and systemic anomalies were also documented where available. The genomic DNA was extracted from peripheral blood leukocytes. All coding exons and intron-exon junctions of paired-like homeodomain transcription factor 2 （PITX2） gene and the forkhead box C1 （FOXC1） gene were amplified by polymerase chain reaction （PCR） and screened for mutation by direct DNA sequencing. Variations detected in exon 5 of PITX2 were further evaluated with cloning sequencing. The exon 5 of PITX2 was also sequenced in 100 healthy controls, unrelated to the family, for comparison. Structural models of the wild type and mutant homeodomain of PITX2 were investigated by SWISS-MODEL. Results： Affected individuals exhibited variable ocular phenotypes, whereas the systemic anomalies were similar. After direct sequencing and cloning sequencing, a heterozygous deletion/insertion mutation c. 198_201delinsTTTCT （p.M661fs＊133） was revealed in exon 5 of PITX2. This mutation co-segregated with all affected individuals in the family and was not found either in unaffected family members or in 100 unrelated controls. Conclusions： We detected a novel frameshift mutation p.M661fs＊133 in PITX2 in a Chinese family with ARS. Although PITX2 mutations and polymorphisms have been re- ported from various ethnic groups, we report for the first time the identification of a novel deletion/insertion mutation that causes frameshift mutation in the homeodomain of PITX2 protein.
