Angiogenic factor with G-patch and FHA domains 1(AGGF1) exhibits a dynamic distribution from the nucleus to the cytoplasm in endothelial cells during angiogenesis, but the biological significance and underlying mechan...Angiogenic factor with G-patch and FHA domains 1(AGGF1) exhibits a dynamic distribution from the nucleus to the cytoplasm in endothelial cells during angiogenesis, but the biological significance and underlying mechanism of this nucleocytoplasmic transport remains unknown. Here, we demonstrate that the dynamic distribution is essential for AGGF1 to execute its angiogenic function. To search the structural bases for this nucleocytoplasmic transport, we characterized three potential nuclear localization regions, one potential nuclear export region, forkhead-associated(FHA), and G-patch domains to determine their effects on nucleocytoplasmic transport and angiogenesis, and we show that AGGF1 remains intact during the dynamic subcellular distribution and the region from 260 to 288 amino acids acts as a signal for its nuclear localization. The distribution of AGGF1 in cytoplasm needs both FHA domain and 14-3-3α/β. Binding of AGGF1 via FHA domain to 14-3-3α/β is required to complete the transport. Thus, we for the first time established structural bases for the nucleocytoplasmic transport of AGGF1 and revealed that the FHA domain of AGGF1 is essential for its nucleocytoplasmic transport and angiogenesis.展开更多
DAWDLE (DDL) gene encodes a protein that contains an N-terminal arginine-rich domain and a C-terminal Fork Head Associated (FHA) domain in Arabidopsis thaliana. DDL protein is believed to function in microRNA biogenes...DAWDLE (DDL) gene encodes a protein that contains an N-terminal arginine-rich domain and a C-terminal Fork Head Associated (FHA) domain in Arabidopsis thaliana. DDL protein is believed to function in microRNA biogenesis by mediating the recruitment of pri-microRNA to DICER-LIKE 1 and also stabilizing the microRNA. The aim of this study was to conduct a structure-function analysis to identify the regions in DDL that are of functional significance. Targeted Induced Local Lesions in Genome screen was performed in the Columbia erecta-105 background of Arabidopsis resulting in the identification of eight point mutations spanning DDL. The mutants were characterized by phenotypic and molecular analyses based on the prior knowledge on ddl knockout mutants. Height of the plant, hypocotyl and root length, and fertility were measured for phenotypic characterization, and microRNA172 levels were measured to assess the mutation effect at the molecular level. Phenotypic and molecular analyses of the mutants revealed effects resulting in ddl phenotypes of varying degrees in different organs and each mutant displayed at least one phenotype studied. Reduction in fertility and increase in stem length were two phenotypes that most of the mutants consistently displayed. Identification and characterization of several key residues in the arginine rich region and FHA domain will serve as an important tool for elucidation of DDL signaling pathway.展开更多
目的:探讨结直肠癌(colorectal cancer,CRC)中非染色体结构维持蛋白凝缩蛋白复合体I亚单位H(non-SMC condensin I complex subunit H,NCAPH)、G补缀FHA域血管新生因子1(angiogenic factor with G and FHA domains 1,AGGF1)及跨膜4L六家...目的:探讨结直肠癌(colorectal cancer,CRC)中非染色体结构维持蛋白凝缩蛋白复合体I亚单位H(non-SMC condensin I complex subunit H,NCAPH)、G补缀FHA域血管新生因子1(angiogenic factor with G and FHA domains 1,AGGF1)及跨膜4L六家族成员1(transmembrane-4-L-six-family-1,TM4SF1)蛋白质表达之间的关系及临床意义。方法:收集145例CRC术后标本和30例癌旁正常黏膜组织标本,采用免疫组织化学法检测CRC和癌旁正常黏膜组织中NCAPH、AGGF1及TM4SF1蛋白质的表达情况,分析其表达与各种临床病理因素的关系以及三者之间的相关性。结果:在CRC和癌旁组织中,NCAPH、AGGF1及TM4SF1的阳性表达率分别为55.2%、53.1%、60.7%和3.3%、6.6%、0,差异均有统计学意义(均P<0.001)。3种蛋白质的表达均与CRC的组织学分化和TNM分期有关(均P<0.001);NCAPH和TM4SF1的表达均与CRC的淋巴结转移有关(均P<0.05);NCAPH和AGGF1的表达均与CRC组织脉管侵犯有关(均P<0.05);AGGF1和TM4SF1的表达均与CRC的肿瘤浸润深度有关(均P<0.01)。TM4SF1的表达分别与NCAPH和AGGF1的表达呈正相关(r值分别为0.311和0.517,均P<0.001);同时,AGGF1与NCAPH的表达亦呈正相关(r=0.291,P=0.001)。Kaplan-Meier生存分析表明:NCAPH、AGGF1及TM4SF1的表达上调均与患者的生存率有关,NCAPH、AGGF1及TM4SF1阳性的患者生存率明显低于三者阴性患者(均P<0.05)。多因素分析表明:TNM分期、NCAPH、AGGF1及TM4SF1的表达和肿瘤脉管侵犯均是影响CRC根治术后患者预后的独立因素(均P<0.05)。结论:CRC组织中NCAPH、AGGF1及TM4SF1的表达上调与CRC的分化程度、转移和预后等因素相关,这些指标的联合检测可能作为判断CRC进展及患者预后的重要指标。展开更多
目的探讨泛素连接酶蛋白(checkpoint with FHA and RING finger domains,CHFR)通过转化生长因子β1(transforming growth factor beta 1,TGF-β1)通路参与并改善肝纤维化的机制。方法将30只小鼠随机分为正常组和模型组,每组15只。模型...目的探讨泛素连接酶蛋白(checkpoint with FHA and RING finger domains,CHFR)通过转化生长因子β1(transforming growth factor beta 1,TGF-β1)通路参与并改善肝纤维化的机制。方法将30只小鼠随机分为正常组和模型组,每组15只。模型组通过四氯化碳(carbon tetrachloride,CCL4)制备肝纤维化模型,模型制备成功后采用Masson染色观察小鼠肝脏纤维化情况,并采用Western blot方法检测小鼠肝脏组织中CHFR的表达水平。体外实验通过构建CHFR质粒转染HEK293T细胞成功高表达后,将转染后的细胞分为载体组和mCHFR组,采用Western blot方法检测载体组、mCHFR组TGF-β1和重组丝/苏氨酸激酶受体Smad家族成员3(Smad family member 3,Smad3)的表达量,从基因和蛋白水平探讨CHFR在肝纤维化中的作用机制。结果Masson染色结果显示,正常组小鼠肝脏汇管区无纤维化现象,肝小叶结构清晰完整,肝细胞分界清楚。模型组小鼠肝脏中的汇管区小叶结构紊乱,形成宽而粗大的纤维条索和纤维间隔。Western blot结果显示,与正常小鼠肝脏相比,模型组CHFR表达量减弱(P<0.05);与载体组对比,mCHFR组TGF-β1和Smad3的表达量减少(P均<0.05)。结论CHFR可能通过TGF-β1通路改善肝纤维化的发生发展,并且可能为肝纤维化的治疗提供靶标。展开更多
基金This work was supported by grants from the National Natural Science Foundation of China(30730047,81070262,81130003 and 81630034).
文摘Angiogenic factor with G-patch and FHA domains 1(AGGF1) exhibits a dynamic distribution from the nucleus to the cytoplasm in endothelial cells during angiogenesis, but the biological significance and underlying mechanism of this nucleocytoplasmic transport remains unknown. Here, we demonstrate that the dynamic distribution is essential for AGGF1 to execute its angiogenic function. To search the structural bases for this nucleocytoplasmic transport, we characterized three potential nuclear localization regions, one potential nuclear export region, forkhead-associated(FHA), and G-patch domains to determine their effects on nucleocytoplasmic transport and angiogenesis, and we show that AGGF1 remains intact during the dynamic subcellular distribution and the region from 260 to 288 amino acids acts as a signal for its nuclear localization. The distribution of AGGF1 in cytoplasm needs both FHA domain and 14-3-3α/β. Binding of AGGF1 via FHA domain to 14-3-3α/β is required to complete the transport. Thus, we for the first time established structural bases for the nucleocytoplasmic transport of AGGF1 and revealed that the FHA domain of AGGF1 is essential for its nucleocytoplasmic transport and angiogenesis.
文摘DAWDLE (DDL) gene encodes a protein that contains an N-terminal arginine-rich domain and a C-terminal Fork Head Associated (FHA) domain in Arabidopsis thaliana. DDL protein is believed to function in microRNA biogenesis by mediating the recruitment of pri-microRNA to DICER-LIKE 1 and also stabilizing the microRNA. The aim of this study was to conduct a structure-function analysis to identify the regions in DDL that are of functional significance. Targeted Induced Local Lesions in Genome screen was performed in the Columbia erecta-105 background of Arabidopsis resulting in the identification of eight point mutations spanning DDL. The mutants were characterized by phenotypic and molecular analyses based on the prior knowledge on ddl knockout mutants. Height of the plant, hypocotyl and root length, and fertility were measured for phenotypic characterization, and microRNA172 levels were measured to assess the mutation effect at the molecular level. Phenotypic and molecular analyses of the mutants revealed effects resulting in ddl phenotypes of varying degrees in different organs and each mutant displayed at least one phenotype studied. Reduction in fertility and increase in stem length were two phenotypes that most of the mutants consistently displayed. Identification and characterization of several key residues in the arginine rich region and FHA domain will serve as an important tool for elucidation of DDL signaling pathway.
文摘目的:探讨结直肠癌(colorectal cancer,CRC)中非染色体结构维持蛋白凝缩蛋白复合体I亚单位H(non-SMC condensin I complex subunit H,NCAPH)、G补缀FHA域血管新生因子1(angiogenic factor with G and FHA domains 1,AGGF1)及跨膜4L六家族成员1(transmembrane-4-L-six-family-1,TM4SF1)蛋白质表达之间的关系及临床意义。方法:收集145例CRC术后标本和30例癌旁正常黏膜组织标本,采用免疫组织化学法检测CRC和癌旁正常黏膜组织中NCAPH、AGGF1及TM4SF1蛋白质的表达情况,分析其表达与各种临床病理因素的关系以及三者之间的相关性。结果:在CRC和癌旁组织中,NCAPH、AGGF1及TM4SF1的阳性表达率分别为55.2%、53.1%、60.7%和3.3%、6.6%、0,差异均有统计学意义(均P<0.001)。3种蛋白质的表达均与CRC的组织学分化和TNM分期有关(均P<0.001);NCAPH和TM4SF1的表达均与CRC的淋巴结转移有关(均P<0.05);NCAPH和AGGF1的表达均与CRC组织脉管侵犯有关(均P<0.05);AGGF1和TM4SF1的表达均与CRC的肿瘤浸润深度有关(均P<0.01)。TM4SF1的表达分别与NCAPH和AGGF1的表达呈正相关(r值分别为0.311和0.517,均P<0.001);同时,AGGF1与NCAPH的表达亦呈正相关(r=0.291,P=0.001)。Kaplan-Meier生存分析表明:NCAPH、AGGF1及TM4SF1的表达上调均与患者的生存率有关,NCAPH、AGGF1及TM4SF1阳性的患者生存率明显低于三者阴性患者(均P<0.05)。多因素分析表明:TNM分期、NCAPH、AGGF1及TM4SF1的表达和肿瘤脉管侵犯均是影响CRC根治术后患者预后的独立因素(均P<0.05)。结论:CRC组织中NCAPH、AGGF1及TM4SF1的表达上调与CRC的分化程度、转移和预后等因素相关,这些指标的联合检测可能作为判断CRC进展及患者预后的重要指标。
文摘目的探讨泛素连接酶蛋白(checkpoint with FHA and RING finger domains,CHFR)通过转化生长因子β1(transforming growth factor beta 1,TGF-β1)通路参与并改善肝纤维化的机制。方法将30只小鼠随机分为正常组和模型组,每组15只。模型组通过四氯化碳(carbon tetrachloride,CCL4)制备肝纤维化模型,模型制备成功后采用Masson染色观察小鼠肝脏纤维化情况,并采用Western blot方法检测小鼠肝脏组织中CHFR的表达水平。体外实验通过构建CHFR质粒转染HEK293T细胞成功高表达后,将转染后的细胞分为载体组和mCHFR组,采用Western blot方法检测载体组、mCHFR组TGF-β1和重组丝/苏氨酸激酶受体Smad家族成员3(Smad family member 3,Smad3)的表达量,从基因和蛋白水平探讨CHFR在肝纤维化中的作用机制。结果Masson染色结果显示,正常组小鼠肝脏汇管区无纤维化现象,肝小叶结构清晰完整,肝细胞分界清楚。模型组小鼠肝脏中的汇管区小叶结构紊乱,形成宽而粗大的纤维条索和纤维间隔。Western blot结果显示,与正常小鼠肝脏相比,模型组CHFR表达量减弱(P<0.05);与载体组对比,mCHFR组TGF-β1和Smad3的表达量减少(P均<0.05)。结论CHFR可能通过TGF-β1通路改善肝纤维化的发生发展,并且可能为肝纤维化的治疗提供靶标。
