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Blood:衰老造血干细胞驱动衰老相关的免疫重建

2018-06-13 MedSci MedSci原创

中心点:老年小鼠的T/B细胞的表型和功能改变主要是由HSCs老化驱动。CASIN处理衰老的HSCs可重建功能与年轻动物相近的免疫系统。摘要:与衰老相关的免疫系统重构会损害其功能完整性,导致老年人发病率和死亡率增加。适应性免疫系统的所有细胞最初都是起源于造血干细胞(HSCs),HSCs衰老或许在衰老相关的免疫系统重构过程中发挥重要作用。近日,BLood杂志发表一篇文章,研究人员发现HSCs衰老,在一

中心点:

老年小鼠的T/B细胞的表型和功能改变主要是由HSCs老化驱动。

CASIN处理衰老的HSCs可重建功能与年轻动物相近的免疫系统。

摘要:

与衰老相关的免疫系统重构会损害其功能完整性,导致老年人发病率和死亡率增加。适应性免疫系统的所有细胞最初都是起源于造血干细胞(HSCs),HSCs衰老或许在衰老相关的免疫系统重构过程中发挥重要作用。

近日,BLood杂志发表一篇文章,研究人员发现HSCs衰老,在一定程度上,受小血红蛋白酶Cdc42活性增强驱动;在体外,用药物CASIN处理,衰老的HSCs可通过抑制Cdc42活性增强而复活。

为研究来源于青年和老年HSCs的免疫系统质量,研究人员在T/B细胞缺陷的年轻RAG1-/-小鼠中建立HSC移植模型。结果发现随着年龄的增长,免疫系统的表型和功能变化主要是由于在衰老过程中HSCs功能发生变化,而且在很大程度上与胸腺无关,因为年轻和衰老的HSCs均可在RAG1-/-宿主中重组不同的T/B细胞亚集,反映了年轻和年老的免疫系统。

此外,用CASIN处理衰老的HSCs可重建与年轻动物相近的免疫系统,对疫苗产生强烈的免疫反应。

总而言之,本研究结果进一步证明了在衰老的HSCs中印迹的表观遗传特征决定了其衍生的T/B细胞的转录谱和功能。

原始出处:

Hanna Leins,et al. Aged murine hematopoietic stem cells drive aging-associated immune remodeling. Blood  2018  :blood-2018-02-831065;  doi: https://doi.org/10.1182/blood-2018-02-831065

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    2018-06-15 俅侠
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    2018-06-13 如风四月天

    真是神奇的人体!

    0

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    2018-06-13 1ddf0692m34(暂无匿称)

    学习了.谢谢分享

    0

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