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首页> 外文期刊>Cell metabolism >Serine Synthesis via PHGDH Is Essential for Heme Production in Endothelial Cells
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Serine Synthesis via PHGDH Is Essential for Heme Production in Endothelial Cells

机译:通过PHGDH的丝氨酸合成对于内皮细胞中的血红素生产是必不可少的

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摘要

The role of phosphoglycerate dehydrogenase (PHGDH), a key enzyme of the serine synthesis pathway (SSP), in endothelial cells (ECs) remains poorly characterized. We report that mouse neonates with EC-specific PHGDH deficiency suffer lethal vascular defects within days of gene inactivation, due to reduced EC proliferation and survival. In addition to nucleotide synthesis impairment, PHGDH knockdown (PHGDH(KD)) caused oxidative stress, due not only to decreased glutathione and NADPH synthesis but also to mitochondrial dysfunction. Electron transport chain (ETC) enzyme activities were compromised upon PHGDH(KD) because of insufficient heme production due to cellular serine depletion, not observed in other cell types. As a result of heme depletion, elevated reactive oxygen species levels caused EC demise. Supplementation of hem in in PHGDH(KD) ECs restored ETC function and rescued the apoptosis and angiogenesis defects. These data argue that ECs die upon PHGDH inhibition, even without external serine deprivation, illustrating an unusual importance of serine synthesis for ECs.
机译:磷酸钙脱氢酶(PHGHDH)的作用,内皮细胞(ECS)中丝氨酸合成途径(SSP)的关键酶仍然存在差。我们认为,由于EC增殖和存活率降低,鼠标新生儿具有特异性PHGGDH缺乏症的新生儿患有基因失活的致命血管缺陷。除核苷酸合成损伤外,PHGDH敲低(PHGDH(KD))引起氧化应激,由于不仅降低了谷胱甘肽和NADPH合成而且对线粒体功能障碍。由于在其他细胞类型中未观察到,在PHGDH(Kd)上,电子传输链(ETC)酶活性在PHGDH(Kd)上受到损害,因此在其他细胞类型中未观察到。由于血红液耗尽,活性氧物质升高导致EC消亡。在PHGDH(KD)ECS恢复等功能中的补充并救出了凋亡和血管生成缺陷。这些数据认为ECS在PHGDH抑制时死亡,即使没有外部丝氨酸剥夺,也表示ECS的丝氨酸合成的不寻常重要性。

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  • 来源
    《Cell metabolism》 |2018年第4期|共28页
  • 作者单位

    VIB Ctr Canc Biol Lab Angiogenesis &

    Vasc Metab B-3000 Leuven Belgium;

    VIB Ctr Canc Biol Lab Angiogenesis &

    Vasc Metab B-3000 Leuven Belgium;

    VIB Ctr Canc Biol Lab Angiogenesis &

    Vasc Metab B-3000 Leuven Belgium;

    MIT Koch Inst Integrat Canc Res 77 Massachusetts Ave Cambridge MA 02139 USA;

    VIB Ctr Canc Biol Lab Angiogenesis &

    Vasc Metab B-3000 Leuven Belgium;

    VIB Ctr Canc Biol Lab Angiogenesis &

    Vasc Metab B-3000 Leuven Belgium;

    Sun Yat Sen Univ Zhongshan Ophthalm Ctr State Key Lab Ophthalmol Guangzhou 510060 Guangdong;

    MIT Koch Inst Integrat Canc Res 77 Massachusetts Ave Cambridge MA 02139 USA;

    Hebrew Univ Jerusalem Dept Dev Biol &

    Canc Res IL-91120 Jerusalem Israel;

    VIB Ctr Canc Biol Lab Angiogenesis &

    Vasc Metab B-3000 Leuven Belgium;

    VIB Ctr Canc Biol Lab Angiogenesis &

    Vasc Metab B-3000 Leuven Belgium;

    Hebrew Univ Jerusalem Dept Dev Biol &

    Canc Res IL-91120 Jerusalem Israel;

    VIB Ctr Canc Biol Lab Angiogenesis &

    Vasc Metab B-3000 Leuven Belgium;

    RIKEN Brain Sci Inst Lab Mol Membrane Neurosci Wako Saitama 3510198 Japan;

    Kyushu Univ Dept Biosci &

    Biotechnol Fukuoka Fukuoka 8128581 Japan;

    VIB Ctr Canc Biol Lab Angiogenesis &

    Vasc Metab B-3000 Leuven Belgium;

    VIB Ctr Canc Biol Lab Angiogenesis &

    Vasc Metab B-3000 Leuven Belgium;

    VIB Ctr Canc Biol Lab Angiogenesis &

    Vasc Metab B-3000 Leuven Belgium;

    Hebrew Univ Jerusalem Dept Dev Biol &

    Canc Res IL-91120 Jerusalem Israel;

    Sun Yat Sen Univ Zhongshan Ophthalm Ctr State Key Lab Ophthalmol Guangzhou 510060 Guangdong;

    MIT Koch Inst Integrat Canc Res 77 Massachusetts Ave Cambridge MA 02139 USA;

    VIB Ctr Canc Biol Lab Angiogenesis &

    Vasc Metab B-3000 Leuven Belgium;

    VIB Ctr Canc Biol Lab Angiogenesis &

    Vasc Metab B-3000 Leuven Belgium;

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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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