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Aging Cell:Rag1免疫缺陷诱导早衰和慢性炎症

2019-07-27 海北 MedSci原创

在哺乳动物中,重组激活基因1(RAG1)在适应性免疫中起关键作用,产生大量免疫球蛋白。

在哺乳动物中,重组激活基因1(RAG1)在适应性免疫中起关键作用,产生大量免疫球蛋白。 

Rag1 - / - 斑马鱼(Danio rerio)在标准的非无菌条件下是可行的,并且到达成年期没有明显的传染病迹象,这表明可以增强先天免疫以补偿适应性免疫的缺乏。

通过使用微阵列分析,研究人员证实了rag1 - / - 鱼中免疫和凋亡相关基因的表达增加。该工具还使研究人员注意到rag1 - / - 斑马鱼中DNA修复和细胞周期机制的改变。

研究人员分析了几种衰老和衰老标志物。除了rag1 - / - 斑马鱼与其野生型(wt)兄弟姐妹相比具有比较低的寿命外,rag1 - / - 显示出更高的细胞周期停滞和凋亡发生率,更多的磷酸化组蛋白H2AX,氧化应激和衰退的抗氧化机制,衰老相关基因的上调表达,衰老相关β-半乳糖苷酶的活性增加,端粒长度缩短,以及视网膜和肝脏中的异常自我更新和修复能力。

代谢组学分析也证明了wt和rag1 - / - 鱼之间的明显差异,以及rag1 - / - 鱼中抗氧化剂代谢物l-乙酰肉碱(ALCAR)的缺乏。

因此,Rag1活性似乎不限于V(D)J重组,其也参与衰老。

此外,研究人员证实了ABT-263(一种已知的衰老致死化合物)的作用,并且首次证实了抗氧化剂ALCAR的体内杀死衰老细胞活性,表明该代谢物对于避免过早衰老是必需的。

原始出处:

Beatriz Novoa et al. Rag1 immunodeficiency‐induced early aging and senescence in zebrafish are dependent on chronic inflammation and oxidative stress. Aging Cell, 2019; DOI: https://doi.org/10.1111/acel.13020


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    2020-02-02 维他命
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    2019-07-27 一个字-牛

    学习了谢谢分享

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