Sarm1-mediated neurodegeneration within the enteric nervous system protects against local inflammation of the colon.

Sarm1-mediated neurodegeneration within the enteric nervous system protects against local inflammation of the colon.
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Sarm1 介导的肠神经系统神经变性可预防结肠局部炎症

DOI:
10.1007/s13238-021-00835-w
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发表时间:
2021-08
期刊:
影响因子:
21.1
通讯作者:
Yang J
Yang J
中科院分区:
生物学1区
文献类型:
--
作者:
Sun Y;Wang Q;Wang Y;Ren W;Cao Y;Li J;Zhou X;Fu W;Yang J

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轴突变性是神经退行性疾病的关键特征之一。在经典的观点中,轴突变性破坏神经连接并促进有害的疾病缺陷。在这里,我们通过先进的3D成像评估了小鼠、非人灵长类动物和人类的肠神经系统(ENS)。我们观察到深刻的神经退行性变的儿茶酚胺能轴突在人类结肠溃疡性结肠炎,同样,在小鼠结肠急性葡聚糖硫酸钠诱导的结肠炎。然而,我们出乎意料地发现,在小鼠中通过Sarm 1缺失阻断这种轴突变性会加剧结肠炎。相反,药物消融或化学抑制的儿茶酚胺能轴突抑制结肠炎症。我们进一步表明,儿茶酚胺能神经递质去甲肾上腺素通过增强IL-17细胞因子的表达而发挥促炎功能。总之,这项研究表明,ENS内的Sarm 1介导的神经变性减轻了结肠的局部炎症,揭示了轴突变性在这种疾病背景下以前未被认识到的有益作用。
Axonal degeneration is one of the key features of neurodegenerative disorders. In the canonical view, axonal degeneration destructs neural connections and promotes detrimental disease defects. Here, we assessed the enteric nervous system (ENS) of the mouse, non-human primate, and human by advanced 3D imaging. We observed the profound neurodegeneration of catecholaminergic axons in human colons with ulcerative colitis, and similarly, in mouse colons during acute dextran sulfate sodium-induced colitis. However, we unexpectedly revealed that blockage of such axonal degeneration by theSarm1deletion in mice exacerbated the colitis condition. In contrast, pharmacologic ablation or chemogenetic inhibition of catecholaminergic axons suppressed the colon inflammation. We further showed that the catecholaminergic neurotransmitter norepinephrine exerted a pro-inflammatory function by enhancing the expression of IL-17 cytokines. Together, this study demonstrated that Sarm1-mediated neurodegeneration within the ENS mitigated local inflammation of the colon, uncovering a previously-unrecognized beneficial role of axonal degeneration in this disease context.
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