CELL:代谢和先天免疫通过UPR成为特定的炎症反应

2019-05-02 海北 MedSci原创

先天免疫反应与髓样细胞的细胞内代谢错综复杂地联系在一起。 Toll样受体(TLR)刺激将细胞内代谢转变为糖酵解,而抗炎信号依赖于增强的线粒体呼吸。

先天免疫反应与髓样细胞的细胞内代谢错综复杂地联系在一起。 Toll样受体(TLR)刺激将细胞内代谢转变为糖酵解,而抗炎信号依赖于增强的线粒体呼吸。

至今为止,外源性代谢信号如何影响免疫反应尚不清楚。最近,研究人员证明了树突状细胞(DC)的TLR依赖性反应被高脂肪酸(FA)代谢环境加剧。FAs抑制TLR诱导的己糖激酶活性,并扰乱三羧酸循环代谢。这些代谢变化增强了线粒体活性氧(mtROS)的产生,进而增强了未折叠蛋白反应(UPR),导致了以IL-23为标志的独特转录组特征。

有趣的是,糖酵解的化学或基因抑制足以诱导这种特异性免疫反应。

相反,减少mtROS产生或XBP1中的DC特异性缺陷减弱了IL-23依赖性银屑病模型中的IL-23表达和皮肤炎症。

因此,先天免疫的微调取决于代谢需求的优化和mtROS诱导的UPR的最小化。


原始出处:

Mogilenko DA et al. Metabolic and Innate Immune Cues Merge into a Specific Inflammatory Response via the UPR. CELL, 2019; doi: 10.1016/j.cell.2019.03.018.


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