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首页> 外文期刊>Molecular and Cellular Biology >p19Arf Represses Platelet-Derived Growth Factor Receptor β by Transcriptional and Posttranscriptional Mechanisms
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p19Arf Represses Platelet-Derived Growth Factor Receptor β by Transcriptional and Posttranscriptional Mechanisms

机译:p19Arf通过转录和转录后机制抑制血小板衍生的生长因子受体β

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In addition to cancer surveillance, p19Arf plays an essential role in blocking signals stemming from platelet-derived growth factor receptor β (Pdgfrβ) during eye development, but the underlying mechanisms have not been clear. We now show that without Arf, pericyte hyperplasia in the eye results from enhanced Pdgfrβ-dependent proliferation from embryonic day 13.5 (E13.5) of mouse development. Loss of Arf in the eye increases Pdgfrβ expression. In cultured fibroblasts and pericyte-like cells, ectopic p19Arf represses and Arf knockdown enhances the expression of Pdgfrβ mRNA and protein. Ectopic Arf also represses primary Pdgfrβ transcripts and a plasmid driven by a minimal promoter, including one missing the CCAAT element required for high-level expression. p19Arf uses both p53-dependent and -independent mechanisms to control Pdgfrβ. In vivo, without p53, Pdgfrβ mRNA is elevated and eye development abnormalities resemble the Arf ?/? phenotype. However, effects of p53 on Pdgfrβ mRNA do not appear to be due to direct p53 or RNA polymerase II recruitment to the promoter. Although p19Arf controls Pdgfrβ mRNA in a p53-dependent manner, it also blunts Pdgfrβ protein expression by blocking new protein synthesis in the absence of p53. Thus, our findings demonstrate a novel capacity for p19Arf to control Pdgfrβ expression by p53-dependent and -independent mechanisms involving RNA transcription and protein synthesis, respectively, to promote the vascular remodeling needed for normal vision.
机译:除癌症监测外,p19 Arf 在眼睛发育过程中在阻止血小板衍生的生长因子受体β(Pdgfrβ)产生的信号中起着至关重要的作用,但其潜在机制尚不清楚。我们现在显示,在没有 Arf 的情况下,眼睛的周细胞增生是由小鼠发育的胚胎第13.5天(E13.5)起增强的Pdgfrβ依赖性增殖引起的。眼中 Arf 的缺失会增加Pdgfrβ的表达。在培养的成纤维细胞和周细胞样细胞中,异位p19 Arf 抑制和 Arf 敲低可以增强Pdgfrβ mRNA和蛋白的表达。异位的 Arf 还抑制初级Pdgfrβ转录本和由最小启动子驱动的质粒,包括缺少高表达所需CCAAT元件的启动子。 p19 Arf 使用与 p53 无关的机制控制Pdgfrβ。在没有p53的体内体内,Pdgfrβ mRNA升高,并且眼睛发育异常类似于 Arf ?/?表型。但是,p53对Pdgfrβ mRNA的影响似乎不是由于直接将p53或RNA聚合酶II募集到启动子。尽管p19 Arf p53 依赖的方式控制Pdgfrβ mRNA,但在不存在p53的情况下,它也可以通过阻止新蛋白质的合成来钝化Pdgfrβ的蛋白质表达。 。因此,我们的研究结果表明p19 Arf 具有通过 p53 依赖性和非依赖性机制分别控制RNA转录和蛋白质合成来促进血管新生的Pdgfrβ表达的新能力。正常视力需要的重塑。

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