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在雄性小鼠中,衰老会影响肺毛细血管内皮细胞在肺损伤后的重编程
Marin Truchi1,2, Marine Gautier-Isola1,2, Grégoire Savary3
1Université Côte d'Azur, UMR CNRS 7275 Inserm U1323, IPMC, Valbonne, France.
Nature communications
|August 6, 2025
概括
衰老会损害肺部再生,改变肺毛细体内皮细胞 (PCEC) 和它们对损伤的反应. 这些与年龄相关的PCEC变化可能会导致老年肺部的持续性纤维化.
科学领域:
- 肺部医学 肺部医学
- 细胞生物学 细胞生物学
- 衰老研究研究 衰老研究
背景情况:
- 衰老是纤维瘤疾病的主要危险因素,其特点是组织再生受损.
- 纤维性疾病,如异常性肺纤维化,显著影响肺功能和患者的结果.
研究的目的:
- 为了研究衰老对白素诱导的损伤后肺再生的影响.
- 为了比较肺毛细血管内皮细胞 (PCEC) 的转录组形状,在纤维化解决过程中,年轻与老年小鼠之间的比较.
- 确定与年龄相关的PCEC分子变化,这些变化可能会导致持续性肺纤维化.
主要方法:
- 使用了纵向单细胞RNA测序和空间转录组学.
- 在三个不同的时间点 (峰值纤维化,再生,分辨率) 进行了从年轻和老年雄性小鼠的白胺诱导纤维化肺部的转录组分析.
- 分析了PCEC亚群的基因表达差异和信号通路变化.
主要成果:
- 肺损伤诱导了三种PCEC亚群的转录组变化,与亲血管性信号传递和Lrg1表达有关.
- 纤维化的解决在年轻和老年小鼠之间有显著差异,在老年人中改变了PCEC标志物的表达.
- 在老年PCEC中发现的与分辨率相关的标志物也在PCEC中检测到来自异常性肺纤维化患者的PCEC.
- 老化改变了PCEC转录组,表现出亲纤维和亲炎症的特征.
结论:
- 在特定的PCEC亚群中,与年龄相关的变化可能会阻碍肺前细胞的分化.
- 这些PCEC变化可能有助于在衰老的肺部和人类纤维性肺部疾病中观察到的持续性纤维化过程.
- 针对与年龄相关的PCEC功能障碍为纤维化肺部疾病提供了潜在的治疗策略.
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