骨髓特异性血栓蛋白-1 缺乏症通过广泛抑制细胞外矩阵蛋白来加剧大动脉破裂
bioRxiv : the preprint server for biology
|August 30, 2024
概括
骨髓细胞中的Thrombospondin-1 (TSP1) 能防止腹腔大动脉动脉瘤 (AAA) 破裂. 这些细胞中TSP1缺乏会增加破裂的风险,突出其在血管壁完整性中的作用.
科学领域:
- 血管生物学 血管生物学
- 动脉样硬化的研究研究.
- 动脉瘤疾病的分子机制
背景情况:
- 腹腔大动脉动脉瘤 (AAA) 破裂带有很高的死亡率.
- 对AAA破裂的分子和细胞驱动因素尚未完全理解.
- 之前的研究表明,血栓蛋白-1 (TSP1) 缺乏通过减少血管炎症来保护血管瘤形成.
研究的目的:
- 为了阐明推动AAA破裂的细胞和分子机制.
- 研究特定细胞类型的TSP1缺陷对AAA破裂事件的影响.
主要方法:
- 在内皮细胞和巨细胞中,TSP1被删除,使用基因杂交 (Thbs1 飞/飞小鼠与VE-cadherin Cre和Lyz2-cre小鼠).
- 在高胆固醇血症小鼠中输注 ангиотензин II 诱导了AAA和破裂.
- 单细胞RNA测序,组织学和Visium空间转录组学被用于分析.
主要成果:
- 骨髓特异性TSP1淘汰赛显著增加了致命的AAA破裂率 (超过2倍).
- 内皮特异性TSP1淘汰并没有增加破裂率.
- 容易破裂的动脉表现出抑制的炎症和细胞外矩阵的产生.
- 在人类AAA组织中,低TSP1表达与大动脉剖析相关.
结论:
- 骨髓细胞衍生的TSP1负面调节AAA破裂.
- TSP1可能通过促进光滑肌肉细胞的矩阵修复来增强血管壁的强度.
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