赫克索金酶是一种天生的免疫受体,用于检测细菌糖
Andrea J Wolf1, Christopher N Reyes2, Wenbin Liang3
1F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA; Division of Immunology, Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA.
Cell
|July 5, 2016
概括
格拉姆阳性细菌通过N-乙葡萄糖胺激活NLRP3炎症酶,由代谢酶hexokinase检测到. 这一发现揭示了一种代谢酶作为模式识别受体,影响免疫反应.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 代谢过程中的代谢.
背景情况:
- NLRP3炎症酶 (NLRP3) 调解炎症反应,包括IL-1β和IL-18的分泌.
- 二甲糖在胞体中的降解通常通过NOD2识别muramyl dipeptide激活炎症途径.
- 将细菌成分与NLRP3激活联系在一起的精确机制仍然是活跃的研究领域.
研究的目的:
- 阐明了格拉姆阳性细菌酸甘降解激活NLRP3炎症体的机制.
- 为了确定参与NLRP3炎症酶激活途径的特定细菌成分和宿主传感器.
- 研究代谢酶在天生的免疫模式识别中的作用.
主要方法:
- 研究了NLRP3炎症酶的激活,以应对糖的降解产物.
- 作为实验工具,利用了N-乙葡萄糖胺和六酶抑制.
- 检查了线粒体外膜上赫索金酶的局部.
- 评估了糖解抑制剂和代谢条件对炎症酶激活的影响.
主要成果:
- NLRP3炎症酶激活是由N-乙葡萄糖胺从peptidoglycan的释放触发的.
- 糖解酶hexokinase作为N-乙烯基葡萄糖胺的细胞质传感器.
- 由N-乙烯基葡萄糖胺抑制基酶导致其与线粒体解离,足以激活NLRP3.
- 代谢条件和影响赫索金酶的糖分抑制剂也会诱导炎症酶激活.
结论:
- 一种代谢酶,hexokinase,作为N-乙葡萄糖胺的模式识别受体起作用.
- 这一途径代表了NLRP3炎症酶激活的新机制,与NOD2信号传递不同.
- 这项研究强调了宿主新陈代谢和先天免疫模式识别之间的相互作用.
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