长寿的肺巨核细胞有助于血小板在血小板缺血模型的恢复
Alison C Livada1,2, Kathleen E McGrath3, Michael W Malloy1
1Aab Cardiovascular Research Institute.
The Journal of clinical investigation
|September 20, 2024
概括
肺巨核细胞 (Mks) 是长寿的,并来自特定的骨髓 (BM) 来源. 这些肺Mks对血小板的产生有显著的贡献,特别是在血小板缺血期间.
科学领域:
- 血液学 血液学 血液学
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
背景情况:
- 肺部巨核细胞 (Mks) 主要是血管外的,具有免疫特征.
- 骨髓 (BM) Mks的寿命短,导致人们假设肺部Mks由BM连续供应.
研究的目的:
- 调查肺部Mks.的起源和功能影响.
- 与BM Mks.相比,要区分肺Mk寿命和对血小板生产的贡献.
主要方法:
- 利用口腔喉输送CFSE染料和生物素用于特定的肺Mk标签.
- 采用了生物体模型和遗传谱系追踪 (MDS1-Cre-ERT2 TdTomato,FlkSwitch mTmG小鼠) 来追踪Mk的起源.
- 从稳定状态的肺Mks中评估了血小板的产生,无菌的血小板缺血,以及疟疾感染模型 (Plasmodium yoelii).
主要成果:
- 标记的肺部Mks持续长达4个月,与BM Mks的寿命 (<1周) 相反.
- 肺Mks起源于通过Flt3独立系的造血干细胞,而不是通过多能原始细胞.
- 肺部居民Mks在稳定状态下贡献了~10%的循环血小板,在血小板缺血和疟疾感染期间增加到~20%.
结论:
- 肺Mks是长寿的,自给自足的细胞,来源于Flt3-独立的BM源.
- 肺部Mks在血小板生产中起着至关重要的作用,特别是在血小板缺血的情况下.
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