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根据C3a/C3a受体的信号传导,SARS-CoV-2尖端蛋白诱导肺内皮细胞功能障碍和血栓炎症
Luca Perico1, Marina Morigi2, Anna Pezzotta2
1Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Bergamo, Italy. luca.perico@marionegri.it.
Scientific reports
|July 14, 2023
概括
在SARS-CoV-2尖端蛋白S1亚单元触发肺血管损伤通过激活补充系统. 通过C3aRa疗法阻断C3a受体可以防止这种S1诱导的肺损伤.
科学领域:
- 免疫学 免疫学 免疫学
- 病理学 病理学 病理学
- 血管生物学 血管生物学
背景情况:
- 尽管SARS-CoV-2尖端蛋白 (S1) 与内皮细胞相互作用,但其在肺血管损伤和损伤机制中的直接作用尚不清楚.
- 了解S1对肺血管系统的影响对于开发向疗法至关重要.
研究的目的:
- 调查SARS-CoV-2尖端蛋白S1亚单元对肺血管损伤的直接影响.
- 阐明S1诱导的肺损伤背后的机制,重点关注补体系统.
主要方法:
- 给小鼠注射了S1转基因用于人类血管素转化酶2 (ACE2).
- 评估肺内皮血栓阻力,C3沉积物,C3a受体 (C3aR) 表达,以及血管/上皮的变化.
- 评估了C3aR抗剂 (C3aRa) 治疗对S1诱导病理的影响.
主要成果:
- 在3天内,S1注射导致肺内皮血栓阻抗 (血栓模块素损失,vWF增加) 的早期丧失.
- 观察到血管和上皮C3沉积物和C3aR表达的增加,先于扩散的膜损伤和7天的纤维素 () /血小板聚合物.
- 治疗C3aRa抑制了C3积累和C3a/C3aR激活,减少了血管血栓炎症和纤维化.
结论:
- SARS-CoV-2 的 S1 子单元直接诱导肺血管功能障碍,并激活补充系统,导致血栓炎性肺损伤.
- C3aR对抗是一种潜在的治疗策略,可以缓解S1-依赖性肺病理.
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