无意中介的衰变控制了先天免疫感知中的负反循环
bioRxiv : the preprint server for biology
|June 4, 2025
概括
病毒感染期间的双链RNA (dsRNA) 传感抑制了无意中介衰变 (NMD). 这种NMD抑制会产生负反循环,限制dSRNA感知并塑造先天免疫反应.
科学领域:
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
背景情况:
- 无意中介衰变 (NMD) 是一种关键的mRNA监测途径,可以降低异常转录.
- 在生理条件下,NMD调节基因表达和同位素丰富度.
- 在病毒感染期间,NMD的作用是复杂的,表现出抗病毒和前病毒效应,需要进一步调查.
研究的目的:
- 调查NMD在病毒感染期间的双链RNA (dsRNA) 感应中的参与.
- 阐明dRNA传感影响NMD活动的机制.
- 了解NMD调制如何影响对病毒刺激的先天免疫反应.
主要方法:
- 利用EIF4A2外基子10B的纳入作为NMD相关的病毒感染期间替代拼接的模型.
- 评估了dSRNA传感对NMD活动的影响.
- 研究了RNaseL和PKR在NMD抑制中的作用.
- 量化IFN-β诱导,干扰素刺激的基因表达和IRF3激活.
- 测量了dsRNA含量及其对PKR和RNaseL激活和细胞死亡的影响.
主要成果:
- dsRNA传感抑制了NMD,主要是通过RNaseL或PKR介导的转化阻断.
- 发现NMD抑制会限制IFN-β和干扰素刺激基因的诱导,这是在IRF3核转位之前.
- 抑制NMD降低了dsRNA水平,随后降低了PKR和RNaseL的激活和由炎酶介导的细胞死亡.
- 这些发现表明,NMD通过调节dRNA负载直接影响dRNA传感.
结论:
- 在病毒感染期间dSRNA传感通过转化抑制抑制NMD.
- 这种抑制建立了一个负反循环,限制dRNA传感,并防止过度激活抗病毒途径.
- 通过控制dsRNA负载和塑造抗病毒反应,NMD在调节先天免疫和炎症方面发挥着关键作用.
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