核酸感应通过偏向的凝血因子VIIa信号传递促进炎症单细胞迁移
Hortensia Zelaya1,2, Kristin Grunz1, T Son Nguyen1
1Center for Thrombosis and Hemostasis, Johannes Gutenberg University Medical Center, Mainz, Germany.
Blood
|December 14, 2023
概括
骨髓细胞因子VIIa (FVIIa) 通过蛋白酶激活受体2 (PAR2) 发出信号,在病毒RNA暴露后驱动肺炎. 这一途径对免疫细胞的招募和迁移至关重要,这表明了对血栓炎症的新治疗点.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 蛋白酶激活受体 (PAR) 将凝血蛋白酶与先天免疫反应联系起来.
- 组织因子 (TF) -因子VIIa (FVIIa) 通过PAR2发出信号,激活ERK和癌细胞迁移.
- 细胞自主TF-FVIIa信号在免疫细胞中的作用尚不清楚.
研究的目的:
- 为了研究骨髓细胞TF-FVIIa信号传递在先天免疫反应中的功能.
- 阐明参与免疫细胞招募和迁移的下游信号通路.
主要方法:
- 使用了耐PAR2裂变或FXa.抗性的转基因小鼠.
- 用于诱导肺炎的多氨酸:多乙酸[Poly (I:C) ].
- 分析了免疫细胞的招募,迁移和ERK酸化.
- 产生了PAR2S365/T368A突变小鼠来评估β-arrestin和ERK支架的作用.
主要成果:
- 骨髓细胞FVII,而不是FX,在Poly (I:C) 挑战后,对肺部的炎症细胞招募至关重要.
- PAR2裂变阻力保护小鼠免受Poly (I:C) 诱导的肺炎.
- 单细胞/巨细胞迁移依赖于ERK激活,MAVS和PAR2介导的信号传递.
- PAR2S365/T368A突变损害了对纤维素素的迁移,并减少了肺免疫细胞的透.
结论:
- TF-FVIIa-PAR2信号,偏向于β-arrestin,驱动肺透作为对病毒核酸的反应.
- 这一途径对于整合素αMβ2依赖于纤维素原的迁移至关重要.
- 针对TF-VIIa信号提供了对血栓炎症疾病的潜在治疗策略.
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