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Circulation:核蛋白S-亚硝基化对诱导多能干细胞的产生至关重要

2019-09-26 MedSci MedSci原创

研究人员发现,细胞自主先天性免疫信号会导致表观遗传修饰因子表达发生全局变化,从而促进细胞核向多能性重新编程。诱导型一氧化氮合酶(NO)的S-亚硝基化作用是先天性免疫的一个重要效应,在成纤维细胞向内皮细胞的转分化中已有报道。因此,研究人员推测s-亚硝基化在细胞核多潜能重编程中也可能发挥作用。研究人员采用小鼠胚胎成纤维小细胞,经一系列实验来验证上述推测。结果显示,最优的先天性免疫激活区,即诱导多能干细

研究人员发现,细胞自主先天性免疫信号会导致表观遗传修饰因子表达发生全局变化,从而促进细胞核向多能性重新编程。诱导型一氧化氮合酶(NO)的S-亚硝基化作用是先天性免疫的一个重要效应,在成纤维细胞向内皮细胞的转分化中已有报道。因此,研究人员推测s-亚硝基化在细胞核多潜能重编程中也可能发挥作用。

研究人员采用小鼠胚胎成纤维小细胞,经一系列实验来验证上述推测。

结果显示,最优的先天性免疫激活区,即诱导多能干细胞最大产量,是由激活的B细胞的核转录因子k-轻链增强子的激活程度、NO合成、核蛋白的S-亚硝基化和DNA可及性决定的。基因或药物抑制诱导型NO合酶可降低DNA的可及性,抑制诱导多能干细胞的产生。NO对DNA可及性的影响部分受核蛋白(包括MTA3、NuRD复合物的亚单位)的S-亚硝基化介导。MTA3的S-亚硝基化与NuRD活性减弱相关。过表达突变型MTA3可影响诱导多能干细胞的产生。

本研究首次提示DNA可及性和诱导多能干细胞产量取决于细胞自主先天性免疫激活的程度和NO的产生。炎症信号和表观遗传可塑性的“黄金区”可能对细胞命运和表型流动性有更广泛的影响。

原始出处:

Palas K. Chanda, et al.Nuclear S-Nitrosylation Defines an Optimal Zone for Inducing Pluripotency.Circulation. 2019;140:1081–1099

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    2020-01-14 showtest
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    2019-09-29 独孤立克

    干细胞是热点,但是进入临床仍然需要时间和临床疗效验证哦

    0

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