重血管化的中性粒细胞需要通过TNFα激活CCR6和CCL20
Holger Lörchner1,2, Laia Cañes Esteve1, Maria Elisa Góes1
1Department of Cardiac Development and Remodeling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (H.L., L.C.E., M.E.G., R.H., N.B., S.G., T.B.).
Circulation research
|August 29, 2023
概括
瘤坏死因子α (TNFα) 信号通过CCL20-CCR6轴招募益血管性中性粒细胞来修复缺血性肌肉组织. 这一途径增强了重血管化,特别是在糖尿病患者的条件下.
科学领域:
- 免疫学 免疫学 免疫学
- 血管生物学 血管生物学
- 再生医学是一种再生医学.
背景情况:
- 免疫-炎症通路,特别是瘤亡因子α (TNFα) 信号传递,对于在缺血性损伤后修复外围肌肉组织至关重要.
- 精确的机制,TNFα编排的招募亲血管原性免疫细胞到缺血部位仍然在很大程度上是未知的.
研究的目的:
- 阐明TNFα信号传导在指导益血管性免疫细胞招募以增强肌肉组织再血管化的作用.
- 研究C-C动机化学因子连接体20 (CCL20) -C-C化学因子受体6 (CCR6) 轴在TNFα介导的血管修复中的参与.
主要方法:
- 利用激光多普勒成像和光片光显微镜来监测肌肉组织重血管化在小鼠后关节动脉绑定.
- 采用骨髓移植,流细胞计和分子技术来研究TNFα信号传递和CCL20-CCR6轴在体外和体内.
- 研究了中性粒细胞及其相关因子,如血管内皮生长因子A (VEGFA) 的功能.
主要成果:
- 瘤亡因子受体1 (TNFR1) 的TNFα介导激活,而不是TNFR2,对于后缺血性再血管化至关重要.
- 鉴定了一种由TNFα诱导的新型益血管性中性粒细胞 (CCR6+粒细胞) 种群,表达了增加的VEGFA.
- 证明TNFR1激活在血管细胞中调节CCL20,促进CCR6在中性粒细胞上的转位,以便在依赖CCL20的情况下招募到缺血部位.
- 在糖尿病小鼠中观察到受损的血管再循环,与降低的亲血管性中性粒细胞和CCL20水平有关.
- 表明,复合CCL20的管理改善了糖尿病缺血肌肉中中性粒细胞的招募和重血管化,并进一步增强了fluvastatin.
结论:
- 由TNFα对CCL20-CCR6轴的局部特异激活会将亲血管性VEGFA表达性中性粒细胞招募到缺血性损伤部位,从而启动肌肉组织的再血管化.
- 这些发现为组织再血管化提供了一个有希望的治疗策略,对糖尿病患者尤其有益.
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