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首页> 外文期刊>Cell metabolism >Rewiring of Glutamine Metabolism Is a Bioenergetic Adaptation of Human Cells with Mitochondrial DNA Mutations
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Rewiring of Glutamine Metabolism Is a Bioenergetic Adaptation of Human Cells with Mitochondrial DNA Mutations

机译:谷氨酰胺代谢的重新灌注是用线粒体DNA突变的人体细胞的生物能量适应

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摘要

Using molecular, biochemical, and untargeted stable isotope tracing approaches, we identify a previously unappreciated glutamine-derived alpha-ketoglutarate (alpha KG ) energy-generating anaplerotic flux to be critical in mitochondrial DNA (mtDNA) mutant cells that harbor human disease-associated oxidative phosphorylation defects. Stimulating this flux with alpha KG supplementation enables the survival of diverse mtDNA mutant cells under otherwise lethal obligatory oxidative conditions. Strikingly, we demonstrate that when residual mitochondrial respiration in mtDNA mutant cells exceeds 45% of control levels, alpha KG oxidative flux prevails over reductive carboxylation. Furthermore, in a mouse model of mitochondrial myopathy, we show that increased oxidative alpha KG flux in muscle arises from enhanced alanine synthesis and release into blood, concomitant with accelerated amino acid catabolism from protein breakdown. Importantly, in this mouse model of mitochondriopathy, muscle amino acid imbalance is normalized by alpha KG supplementation. Taken together, our findings provide a rationale for alpha KG supplementation as a therapeutic strategy for mitochondrial myopathies.
机译:使用分子,生化和未明确的稳定同位素跟踪方法,我们鉴定先前未被覆盖的谷氨酰胺衍生的α-酮酮(Alpha kg)能量产生的肛门扑络合物,以归属于患有人类疾病相关氧化的线粒体DNA(MTDNA)突变细胞中临界磷酸化缺陷。用αkg补充刺激该助焊剂使得能够在诸如致死的致命氧化条件下存活不同的MTDNA突变体细胞。令人醒目的是,我们证明,当MTDNA突变细胞中的残留线粒体呼吸超过45%的对照水平时,αKg氧化通量在还原羧化上占该氧化剂。此外,在线粒体肌病的小鼠模型中,我们表明肌肉中的氧化αkg通量增加,从增强的丙氨酸合成和释放到血液中,伴随着来自蛋白质分解的加速氨基酸分解代谢。重要的是,在这种线粒体调节病的小鼠模型中,通过αkg补充,肌肉氨基酸不平衡归一化。我们的发现在一起,提供了αKg补充的理由,作为线粒体肌病的治疗策略。

著录项

  • 来源
    《Cell metabolism》 |2018年第5期|共24页
  • 作者单位

    Weill Cornell Med Dept Pharmacol New York NY 10065 USA;

    Weill Cornell Med Feil Family Brain &

    Mind Res Inst New York NY 10065 USA;

    Weill Cornell Med Feil Family Brain &

    Mind Res Inst New York NY 10065 USA;

    Weill Cornell Med Feil Family Brain &

    Mind Res Inst New York NY 10065 USA;

    Weill Cornell Med Feil Family Brain &

    Mind Res Inst New York NY 10065 USA;

    Weill Cornell Med Feil Family Brain &

    Mind Res Inst New York NY 10065 USA;

    Weill Cornell Med Feil Family Brain &

    Mind Res Inst New York NY 10065 USA;

    Univ Cattolica Sacro Cuore Inst Neurol Rome Italy;

    Sloan Kettering Inst Canc Res Ctr Stem Cell Biol New York NY 10065 USA;

    Bellaria Hosp Inst Neurol Sci Bologna IRCCS Bologna Italy;

    Washington State Univ Coll Pharm Dept Pharmaceut Sci Spokane WA 99210 USA;

    Weill Cornell Med Feil Family Brain &

    Mind Res Inst New York NY 10065 USA;

    Weill Cornell Med Dept Pharmacol New York NY 10065 USA;

    Weill Cornell Med Feil Family Brain &

    Mind Res Inst New York NY 10065 USA;

    Weill Cornell Med Feil Family Brain &

    Mind Res Inst New York NY 10065 USA;

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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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