The Mitochondrion-lysosome Axis in Adaptive and Innate Immunity: Effect of Lupus Regulator Peptide P140 on Mitochondria Autophagy and NETosis.

The Mitochondrion-lysosome Axis in Adaptive and Innate Immunity: Effect of Lupus Regulator Peptide P140 on Mitochondria Autophagy and NETosis.
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DOI:
10.3389/fimmu.2018.02158
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发表时间:
2018
影响因子:
7.3
通讯作者:
Muller S
Muller S
中科院分区:
医学2区
文献类型:
--
作者:
Bendorius M;Neeli I;Wang F;Bonam SR;Dombi E;Buron N;Borgne-Sanchez A;Poulton J;Radic M;Muller S

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线粒体作为细胞能量稳态和代谢状态的传感器值得特别关注。此外,线粒体整合细胞内和细胞外信号以确定从增殖到细胞死亡的适当细胞反应。在自身免疫中,与其他炎症性慢性疾病一样,免疫细胞的代谢可能会被广泛重塑,扰乱敏感的耐受机制。在这里,我们检查了称为 P140 的治疗性 21 聚体肽的分布和作用,它在调节炎症环境中的免疫反应方面显示出显着的功效。我们测量了 P140 和对照肽对分离线粒体的影响、活细胞中肽的分布及其对关键自噬调节因子水平的影响。我们的数据表明,虽然 P140 靶向宏观和伴侣介导的自噬过程,但它对线粒体自噬几乎没有影响(如果有的话)。然而,值得注意的是,它抑制暴露于固定 NET-抗 DNA IgG 复合物的中性粒细胞的 NET 释放。总之,我们的结果表明,在线粒体-溶酶体轴(可能是 NETosis 和炎症的驱动因素)中,P140 肽并不通过直接影响线粒体来发挥作用。
Mitochondria deserve special attention as sensors of cellular energy homeostasis and metabolic state. Moreover, mitochondria integrate intra- and extra-cellular signals to determine appropriate cellular responses that range from proliferation to cell death. In autoimmunity, as in other inflammatory chronic disorders, the metabolism of immune cells may be extensively remodeled, perturbing sensitive tolerogenic mechanisms. Here, we examine the distribution and effects of the therapeutic 21-mer peptide called P140, which shows remarkable efficacy in modulating immune responses in inflammatory settings. We measured P140 and control peptide effects on isolated mitochondria, the distribution of peptides in live cells, and their influence on the levels of key autophagy regulators. Our data indicate that while P140 targets macro- and chaperone-mediated autophagy processes, it has little effect, if any, on mitochondrial autophagy. Remarkably, however, it suppresses NET release from neutrophils exposed to immobilized NET-anti-DNA IgG complexes. Together, our results suggest that in the mitochondrion-lysosome axis, a likely driver of NETosis and inflammation, the P140 peptide does not operate by affecting mitochondria directly.
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