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首页> 外文期刊>Cell metabolism >FBW7 Mediates Senescence and Pulmonary Fibrosis through Telomere Uncapping
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FBW7 Mediates Senescence and Pulmonary Fibrosis through Telomere Uncapping

机译:FBW7通过端粒Undaplation介导衰老和肺纤维化

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摘要

Tissue stem cells undergo premature senescence under stress, promoting age-related diseases; however, the associated mechanisms remain unclear. Here, we report that in response to radiation, oxidative stress, or bleomycin, the E3 ubiquitin ligase FBW7 mediates cell senescence and tissue fibrosis through telomere uncapping. FBW7 binding to telomere protection protein 1 (TPP1) facilitates TPP1 multisite polyubiquitination and accelerates degradation, triggering telomere uncapping and DNA damage response. Overexpressing TPP1 or inhibiting FBW7 by genetic ablation, epigenetic interference, or peptidomimetic telomere dysfunction inhibitor (TELODIN) reduces telomere uncapping and shortening, expanding the pulmonary alveolar AEC2 stem cell population in mice. TELODIN, synthesized from the seventh b strand blade of FBW7 WD40 propeller domain, increases TPP1 stability, lung respiratory function, and resistance to senescence and fibrosis in animals chronically exposed to environmental stress. Our findings elucidate a pivotal mechanism underlying stress-induced pulmonary epithelial stem cell senescence and fibrosis, providing a framework for aging-related disorder interventions.
机译:组织干细胞在压力下过早衰老,促进与年龄相关的疾病;然而,相关机制仍不清楚。在这里,我们报告了E3泛素连接酶FBW7在辐射、氧化应激或博莱霉素的反应中,通过端粒解封介导细胞衰老和组织纤维化。FBW7与端粒保护蛋白1(TPP1)结合,促进TPP1多位点泛素化,加速降解,触发端粒解包裹和DNA损伤反应。通过基因消融、表观遗传干扰或拟肽端粒功能障碍抑制剂(TELODIN)过度表达TPP1或抑制FBW7可减少端粒的解包裹和缩短,从而扩大小鼠肺泡AEC2干细胞群。TELODIN由FBW7 WD40螺旋桨结构域的第七个b链叶片合成,在长期暴露于环境应激的动物中增加TPP1稳定性、肺呼吸功能和抗衰老和纤维化的能力。我们的发现阐明了应激诱导肺上皮干细胞衰老和纤维化的关键机制,为衰老相关疾病干预提供了框架。

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  • 来源
    《Cell metabolism》 |2020年第5期|共27页
  • 作者单位

    Hangzhou Normal Univ Sch Med Inst Ageing Res Hangzhou 311121 Zhejiang Peoples R China;

    Hangzhou Normal Univ Sch Med Inst Ageing Res Hangzhou 311121 Zhejiang Peoples R China;

    Hangzhou Normal Univ Sch Med Inst Ageing Res Hangzhou 311121 Zhejiang Peoples R China;

    Hangzhou Normal Univ Sch Med Inst Ageing Res Hangzhou 311121 Zhejiang Peoples R China;

    Hangzhou Normal Univ Sch Med Inst Ageing Res Hangzhou 311121 Zhejiang Peoples R China;

    Hangzhou Normal Univ Sch Med Inst Ageing Res Hangzhou 311121 Zhejiang Peoples R China;

    Hangzhou Normal Univ Sch Med Inst Ageing Res Hangzhou 311121 Zhejiang Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 内分泌腺疾病及代谢病;
  • 关键词

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