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首页> 外文期刊>Science Signaling >Nuclear PTEN enhances the maturation of a microRNA regulon to limit MyD88-dependent susceptibility to sepsis
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Nuclear PTEN enhances the maturation of a microRNA regulon to limit MyD88-dependent susceptibility to sepsis

机译:核PTEN增强了MICRRNA CONGRON的成熟,以限制对败血症的MYD88依赖性易感性

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摘要

Sepsis-induced organ damage is caused by systemic inflammatory response syndrome (SIRS), which results in substantial comorbidities. Therefore, it is of medical importance to identify molecular brakes that can be exploited to dampen inflammation and prevent the development of SIRS. We investigated the role of phosphatase and tensin homolog (PTEN) in suppressing SIRS, increasing microbial clearance, and preventing lung damage. Septic patients and mice with sepsis exhibited increased PTEN expression in leukocytes. Myeloid-specific Pten deletion in an animal model of sepsis increased bacterial loads and cytokine production, which depended on enhanced myeloid differentiation primary response gene 88 (MyD88) abundance and resulted in mortality. PTEN-mediated induction of the microRNAs (miRNAs) miR125b and miR203b reduced the abundance of MyD88. Loss-and gain-of-function assays demonstrated that PTEN induced miRNA production by associating with and facilitating the nuclear localization of Drosha-Dgcr8, part of the miRNA-processing complex. Reconstitution of PTEN-deficient mouse embryonic fibroblasts with a mutant form of PTEN that does not localize to the nucleus resulted in retention of Drosha-Dgcr8 in the cytoplasm and impaired production of mature miRNAs. Thus, we identified a regulatory pathway involving nuclear PTEN-mediated miRNA generation that limits the production of MyD88 and thereby limits sepsis-associated mortality.
机译:脓毒症诱导的器官损伤是由全身炎症反应综合征(SIRS)引起的,这导致了大量的合并症。因此,鉴定分子制动器的医学重要性是可以利用抑制炎症并防止先生的发展。我们研究了磷酸酶和张素同源物(PTEN)在抑制SIR,增加微生物间隙和预防肺部损伤的作用。脓毒症患者和小鼠患有败血症的小鼠在白细胞中增加了PTEN表达。在败血症增加的细菌载量和细胞因子产生的动物模型中霉菌特异性PTEN缺失,这取决于增强的骨髓分化初级反应基因88(MYD88)丰富,导致死亡率。 PTEN介导的microRNA(miRNA)miR125b和mir203b的诱导降低了MYD88的丰度。丧失和函数的测定证明PTEN诱导的miRNA生产通过与并促进DROSHA-DGCR8的核定位,部分miRNA加工复合物。用PTEN的PTEN缺乏小鼠胚胎成纤维细胞的重构不定位于细胞核的PTEN,导致在细胞质中保留DROSHA-DGCR8并受损的成熟miRNA的产生。因此,我们鉴定了涉及核PTEN介导的miRNA生成的调节途径,限制了MYD88的产生,从而限制了脓毒症相关的死亡率。

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  • 来源
    《Science Signaling》 |2018年第528期|共14页
  • 作者单位

    Indiana Univ Sch Med Dept Microbiol &

    Immunol Indianapolis IN 46202 USA;

    Indiana Univ Sch Med Dept Microbiol &

    Immunol Indianapolis IN 46202 USA;

    Indiana Univ Sch Med Dept Microbiol &

    Immunol Indianapolis IN 46202 USA;

    Indiana Univ Sch Med Dept Microbiol &

    Immunol Indianapolis IN 46202 USA;

    Indiana Univ Sch Med Herman B Wells Ctr Pediat Res Dept Pediat Indianapolis IN 46202 USA;

    Indiana Univ Sch Med Dept Microbiol &

    Immunol Indianapolis IN 46202 USA;

    Vanderbilt Univ Med Ctr Dept Med Div Infect Dis 221 Kirkland Hall Nashville TN 37235 USA;

    Indiana Univ Sch Med Dept Microbiol &

    Immunol Indianapolis IN 46202 USA;

    Univ Sao Paulo Inst Biomed Sci Dept Immunol BR-05508000 Sao Paulo Brazil;

    Cincinnati Childrens Hosp Med Ctr Div Crit Care Med Cincinnati OH 45229 USA;

    Yale Univ Sch Med Dept Internal Med Sect Pulm &

    Critical Care Med New Haven CT 06520 USA;

    Yale Univ Sch Med Dept Internal Med Sect Pulm &

    Critical Care Med New Haven CT 06520 USA;

    Univ Sao Paulo Ribeirao Preto Med Sch Dept Pharmacol BR-14049900 Ribeirao Preto Brazil;

    Univ Sao Paulo Ribeirao Preto Med Sch Dept Pharmacol BR-14049900 Ribeirao Preto Brazil;

    Indiana Univ Sch Med Dept Microbiol &

    Immunol Indianapolis IN 46202 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 细胞生物学;
  • 关键词

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