老化的造血干细胞捕获调节性T细胞,以创造一个生存的微环境
Weinian Liao1, Chaonan Liu1, Ke Yang2
1State Key Laboratory of Trauma, Burns, and Combined Injury, Institute of Combined Injury, Chongqing Engineering Research Center for Nanomedicine, College of Preventive Medicine, Army Medical University (Third Military Medical University), 400038, Chongqing, China.
Cellular & molecular immunology
|August 29, 2023
概括
老化的干细胞通过吸引调节性T细胞 (Tregs) 来保护自己,这促进了它们的生存. 这种相互作用有助于突变的造血干细胞 (HSC) 在衰老过程中获得生存优势.
科学领域:
- 干细胞生物学 干细胞生物学
- 免疫学 免疫学 免疫学
- 衰老的研究研究.
背景情况:
- 在衰老过程中,DNA突变会在干细胞中积累.
- 老化干细胞获得克隆优势的机制尚未完全理解.
研究的目的:
- 为了研究DNA突变积累的造血干细胞 (HSCs) 在衰老过程中如何获得克隆优势.
- 阐明调控性T细胞 (Tregs) 在HSC衰老中的作用.
主要方法:
- 利用一只小鼠模型对辐射诱导的过早衰老和中年老鼠进行了研究.
- 分析了HSC中DNA突变积累的情况.
- 研究了主要组织相容性复合物II类 (MHCII) 和Tregs在HSC利基中的作用.
- 检查了连xin 43 (Cx43) 介导的间隙连接和循环腺单酸盐 (cAMP) 信号传输.
主要成果:
- 在HSC中与衰老相关的DNA突变上调了表面MHCII表达.
- 上调的MHCII促进了骨髓 (BM) 居民Tregs的识别,促进Treg扩张和积累.
- BM Tregs与老年HSC建立Cx43介导的间隙结,通过蛋白激酶A (PKA) 信号传递转移cAMP以促进HSC存活.
- 准HSC-Treg相互作用或减少Tregs可以防止HSC过早和生理衰老.
结论:
- 老年HSC使用一个活跃的自我保护机制来生存并获得克隆优势.
- 这种机制涉及将当地Tregs陷入困境,以创造一个生存位.
- HSC-Treg相互作用是干细胞衰老和存活的关键因素.
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