RNA螺旋酶DDX3X通过支持MCL1表达来促进NK细胞的生存
Eshana Mukhopadhyay1,2, Nora Lakes2,3,4, Durga Krishnamurthy2
1Development, Stem Cells, and Regenerative Medicine Graduate Program, University of Cincinnati College of Medicine, Cincinnati, OH, United States.
死亡盒RNA螺旋酶DDX3X对于自然杀手 (NK) 细胞的生存至关重要. 它通过增强生存蛋白MCL1.1的翻译来支持NK细胞的维持.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 包括DDX3X在内的DEAD-boxRNA螺旋酶是RNA处理和新陈代谢的重要调节者.
- 以前的研究表明,Ddx3x在造血细胞中的干扰导致NK细胞丧失,但其在NK细胞中的特定作用尚不清楚.
研究的目的:
- 研究DDX3X在自然杀手 (NK) 细胞的发展和生存中的特定作用.
- 阐明DDX3X影响NK细胞活力的分子机制.
主要方法:
- 使用Ddx3x-floxed和Ncr1-iCre小鼠生成Ddx3x缺乏NK细胞.
- 利用CRISPR介导的删除和药理抑制来研究成熟NK细胞中的DDX3X功能.
- 评估了细胞活力,蛋白质表达 (MCL1,BCL-2,BCL-xL) 和与亡相关的基因删除 (Bak,Bax).
主要成果:
- 在承诺的NK细胞中删除Ddx3x导致NK细胞群体体体内显著缺陷,并阻断了体外生成.
- 在成熟的NK细胞中抑制DDX3X导致了快速的细胞死亡,与降低的MCL1蛋白水平有关.
- DDX3X通过促进其新的翻译来支持MCL1蛋白表达,而不会影响mRNA水平或蛋白质降解.
结论:
- DDX3X在维持NK细胞区间方面发挥着至关重要的作用.
- RNA螺旋酶DDX3X对于NK细胞的存活是必不可少的,它通过对存活蛋白MCL1.1的翻译调节来维持NK细胞的存活.
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