Regulation of the number of aetivin receptors that are present in the cell membrane plays a key role in the modulation of cellular responses to activin. In order to find the regulators, a novel protein ARIPzip, intera...Regulation of the number of aetivin receptors that are present in the cell membrane plays a key role in the modulation of cellular responses to activin. In order to find the regulators, a novel protein ARIPzip, interacting with activin type II receptors, was searched and identified by using yeast two-hybrid screening. ARIPzip is a splicing variant of ARIP2. This has been discussed previously. ARIPzip can specifically interact with ActR Ⅱ A, and is widely distributed in mouse tissues. Overexpression of ARIPzip can cause the activin-induced transcriptional activities to increase in a dose-dependent manner while the overexpression of ARIV2 can decrease these activities. These data suggest that the C-terminal rezions of ARIP2 and ARIPzip are involved in the regulation of activin signaling.展开更多
文摘Regulation of the number of aetivin receptors that are present in the cell membrane plays a key role in the modulation of cellular responses to activin. In order to find the regulators, a novel protein ARIPzip, interacting with activin type II receptors, was searched and identified by using yeast two-hybrid screening. ARIPzip is a splicing variant of ARIP2. This has been discussed previously. ARIPzip can specifically interact with ActR Ⅱ A, and is widely distributed in mouse tissues. Overexpression of ARIPzip can cause the activin-induced transcriptional activities to increase in a dose-dependent manner while the overexpression of ARIV2 can decrease these activities. These data suggest that the C-terminal rezions of ARIP2 and ARIPzip are involved in the regulation of activin signaling.
文摘目的:探讨激活素受体相互作用蛋白2(ARIP2)在肝细胞内的表达形式及其介导的生物学作用.方法:采用免疫组织化学及细胞化学染色、Western blot检测ARIP2蛋白在小鼠肝组织及肝癌细胞系Hepal-6细胞内的表达;采用激活素特异应答的CAGA-lux报告基因质粒分析ARIP2对激活素诱导的特异基因转录的影响;MTT法检测ARIP2过表达对Hepal-6细胞增殖的彰响.结果:ARIP2蛋白可在小鼠肝组织及Hepal-6细胞表达.激活素A刺激Hepal-6细胞ARIP2蛋白表达呈时间依赖性升高,于24 h达到高峰;12 h、24 h测定值与对照组相比有显著性意义(1.01±0.16,1.62±0.26 vs 0.82±0.11.P<0.05).pcDNA3-ARIP2转染Hepal-6细胞.可以明显抑制激活素诱导的特异基因转录;MTT检测显示激活素A(5μg/L、10μg/L)可以明显抑制Hepal-6细胞增殖,其570 nm吸光度值与对照组相比有显著差异(1.59±0.03、1.49±0.04 vs 1.79±0.07,P<0.05,P<0.01).在Hepal-6细胞内过表达ARIP2可以阻断激活素A对Hepal-6细胞的增殖抑制作用.结论:ARIP2有望成为治疗激活素诱导的肝脏损伤性疾病的基因调控靶点.
