谷氨酸通过维持IRG1 / itaconate轴,限制了宏细胞中的NLRP3炎症酶激活和烧灭
Xiaoli Chen1, Yuanfeng Zhu1, Lin Xia1
1Clinical Medical Research Center, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China.
The FEBS journal
|April 29, 2025
概括
缺乏谷氨激活NLRP3炎症体,通过损害IRG1/伊他康酸盐通路. 补充谷氨胺可以防止炎症和组织损伤在败血症.
科学领域:
- 免疫学 免疫学 免疫学
- 代谢途径 代谢途径
- 蜂信号传输是如何进行的
背景情况:
- 异常激活含有蛋白3 (NLRP3) 炎症酶的NACHT,LRR和PYD域驱动着炎症性疾病.
- 功能障碍的谷氨胺代谢与炎症有关,但机制尚不清楚.
研究的目的:
- 研究谷氨胺代谢在NLRP3炎症酶激活中的作用.
- 阐明将谷氨酸代谢与NLRP3炎症酶调节联系起来的分子机制.
主要方法:
- 在缺乏谷氨胺的条件下培养了巨细胞.
- 评估了NLRP3炎症酶激活,热和细胞因子释放.
- 分析了谷氨酸溶解,三碳酸 (TCA) 循环中间体和伊塔科纳特生产.
- 使用了免疫反应基因1 (IRG1) 和转录因子EB (TFEB) 的过度表达.
- 用一种小鼠败血症模型来评估治疗潜力.
主要成果:
- 缺少谷氨胺增强了NLRP3炎症酶组合,热和IL-1β/IL-18成熟.
- 抑制谷氨酸溶解模仿谷氨酸剥夺效应,由α-甲酸 (α-KG) 逆转.
- 谷氨胺缺乏通过TFEB损害IRG1/谷氨酸轴,从而降低了谷氨酸的产量.
- 外源性伊塔科纳酸或IRG1过度表达抑制了NLRP3炎症酶激活.
- 谷氨胺补充剂在败血症小鼠中提供保护,防止炎症和组织损伤.
结论:
- 谷氨胺代谢通过IRG1/itaconate通路严格调节NLRP3炎症酶激活.
- 向谷氨胺代谢为炎症性疾病提供了潜在的治疗策略.
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