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首页> 外文期刊>Cell cycle >Perturbation of RNA Polymerase I transcription machinery by ablation of HEATR1 triggers the RPL5/RPL11-MDM2-p53 ribosome biogenesis stress checkpoint pathway in human cells
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Perturbation of RNA Polymerase I transcription machinery by ablation of HEATR1 triggers the RPL5/RPL11-MDM2-p53 ribosome biogenesis stress checkpoint pathway in human cells

机译:通过烧蚀HeAtr1扰动RNA聚合酶I转录机械的扰动触发了人细胞中的RPL5 / RPL11-MDM2-P53核糖体生物发生应力检查点途径

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摘要

Ribosome biogenesis is an energy consuming process which takes place mainly in the nucleolus. By producing ribosomes to fuel protein synthesis, it is tightly connected with cell growth and cell cycle control. Perturbation of ribosome biogenesis leads to the activation of p53 tumor suppressor protein promoting processes like cell cycle arrest, apoptosis or senescence. This ribosome biogenesis stress pathway activates p53 through sequestration of MDM2 by a subset of ribosomal proteins (RPs), thereby stabilizing p53. Here, we identify human HEATR1, as a nucleolar protein which positively regulates ribosomal RNA (rRNA) synthesis. Downregulation of HEATR1 resulted in cell cycle arrest in a manner dependent on p53. Moreover, depletion of HEATR1 also caused disruption of nucleolar structure and activated the ribosomal biogenesis stress pathway - RPL5 / RPL11 dependent stabilization and activation of p53. These findings reveal an important role for HEATR1 in ribosome biogenesis and further support the concept that perturbation of ribosome biosynthesis results in p53-dependent cell cycle checkpoint activation, with implications for human pathologies including cancer.
机译:核糖体生物发生是一种能量消耗过程,其主要发生在核仁中。通过将核糖体产生燃料蛋白质合成,它与细胞生长和细胞循环控制密切相关。核糖体生物发生的扰动导致p53肿瘤抑制蛋白的活化促进细胞周期骤停,细胞凋亡或衰老等方法。该核糖体生物发生应力途径通过核糖体蛋白(RPS)的子集来激活P53,通过核糖体蛋白(RPS)的子集,从而稳定P53。这里,我们鉴定人的HEATR1,作为核致蛋白,其呈正调节核糖体RNA(RRNA)合成。 HEATR1的下调导致细胞周期被依赖于P53的方式。此外,HEATR1的耗竭也引起了核仁结构的破坏并激活了核糖体生物发生应力途径 - RPL5 / RPL11依赖性稳定和P53的活化。这些发现揭示了对核糖体生物发生中的HEATR1的重要作用,进一步支持核糖体生物合成扰动的概念导致P53依赖性细胞周期检查点激活,具有对包括癌症的人类病理学的影响。

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