激活增强子结合蛋白4(activating enhancer binding protein 4,AP4)是近年来发现的一个重要转录因子。AP4是c-MYC的重要下游因子,广泛调控细胞增殖与分化、细胞周期、细胞凋亡、免疫应答等进程。AP4可促进正常细胞恶性转化,独立地诱导...激活增强子结合蛋白4(activating enhancer binding protein 4,AP4)是近年来发现的一个重要转录因子。AP4是c-MYC的重要下游因子,广泛调控细胞增殖与分化、细胞周期、细胞凋亡、免疫应答等进程。AP4可促进正常细胞恶性转化,独立地诱导肿瘤细胞发生上皮间充质转化(epithelial-mesenchymal transition,EMT),增强肿瘤细胞的迁移侵袭能力,促进肿瘤转移,在临床上与多种肿瘤密切相关。本文综述了AP4的分子特征与作用机制,并介绍了AP4的调控网络和在肿瘤发生发展中的研究进展。对AP4的深入研究将有助于了解生命活动的基本原理,并为肿瘤诊治提供新的思路和方法。展开更多
[目的]预测分析人转录因子激活增强子结合蛋白4(activating enhancer binding protein 4,AP4)的性质、结构和功能。[方法]采用生物信息学方法对人AP4蛋白的理化性质、物种间同源性、信号肽与跨膜区、亲水性、蛋白亚细胞定位、蛋白质二/...[目的]预测分析人转录因子激活增强子结合蛋白4(activating enhancer binding protein 4,AP4)的性质、结构和功能。[方法]采用生物信息学方法对人AP4蛋白的理化性质、物种间同源性、信号肽与跨膜区、亲水性、蛋白亚细胞定位、蛋白质二/三级结构、三级结构可靠性、蛋白质相互作用等方面进行预测和分析。[结果]人AP4蛋白全长338个氨基酸,理论等电点5.63,相对分子质量38.73 kDa。AP4在进化上较为保守,不含信号肽与跨膜区,属于亲水性蛋白质,94.1%可信度定位于细胞核。二级结构含10个α螺旋区,占全部氨基酸的54.14%,5个β折叠区,占7.99%,其余37.87%的氨基酸处于无规卷曲状态。三维建模结果可靠。预测到10个与AP4存在相互作用的蛋白。[结论]系统预测分析了人AP4蛋白的性质、结构和功能。展开更多
Cystic fibrosis is a life-threatening, wide spread genetic disease diagnosed in 1 to 3000 livebirths of the Caucasian population. Here a mouse model for this disease is described and optimized using the CFTR-channel s...Cystic fibrosis is a life-threatening, wide spread genetic disease diagnosed in 1 to 3000 livebirths of the Caucasian population. Here a mouse model for this disease is described and optimized using the CFTR-channel selective inhibitor CFTR(inh 172). The target parameter was mucociliary clearance measured using microdialysis of the transported fluorescent dye rhodamine in the mouse trachea in situ. The impact of Ap4A (diadenosine tetraphosphate) as a potential drug was investigated. Its inhalation was effective at low concentrations;established compounds such as Salbutamol and UTP increased mucociliary clearance as well. Our data show a functioning model of cystic fibrosis and the effectiveness of the newly tested Ap4A.展开更多
文摘Cystic fibrosis is a life-threatening, wide spread genetic disease diagnosed in 1 to 3000 livebirths of the Caucasian population. Here a mouse model for this disease is described and optimized using the CFTR-channel selective inhibitor CFTR(inh 172). The target parameter was mucociliary clearance measured using microdialysis of the transported fluorescent dye rhodamine in the mouse trachea in situ. The impact of Ap4A (diadenosine tetraphosphate) as a potential drug was investigated. Its inhalation was effective at low concentrations;established compounds such as Salbutamol and UTP increased mucociliary clearance as well. Our data show a functioning model of cystic fibrosis and the effectiveness of the newly tested Ap4A.
