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由线粒体衍生的dSRNA诱导的压力颗粒促进IRF3介导的纤维化反应
bioRxiv : the preprint server for biology
|June 4, 2025
概括
转化生长因子-β (TGFβ) 通过线粒体衍生的双链RNA和压力颗粒激活干扰素调节因子3 (IRF3),促进肝纤维化. 阻断这种途径会减少肝星细胞中的纤维化反应.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 肝病学 肝病学是一种肝病学.
背景情况:
- 干扰素调节因子3 (IRF3) 激活由核酸促进抗病毒反应.
- 转化生长因子-β (TGFβ) 信号传输是纤维化疾病的关键驱动因素,包括肝纤维化.
- 肝星细胞是肝纤维化过程中的核心参与者.
研究的目的:
- 阐明将TGFβ刺激与肝星细胞中的IRF3激活联系在一起的分子机制.
- 研究细胞质压力颗粒和线粒体衍生RNA在TGFβ诱导的纤维化反应中的作用.
- 根据新的TGFβ-IRF3通路,确定肝纤维化的潜在治疗点.
主要方法:
- 使用短干扰RNA (siRNA) 来消耗LX2人肝星细胞中的IRF3的基因沉默.
- 无偏见的蛋白质组分析以确定IRF3相互作用蛋白.
- 对细胞质压力颗粒形成和线粒体衍生双链RNA (mt-dsRNA) 积累的评估.
- 功能性试验评估G3BP1阻塞和mt-dsRNA耗尽对纤维化反应的影响.
主要成果:
- 抑制IRF3显著降低了TGFβ诱导的肝星细胞纤维化反应.
- 蛋白质组分析显示,IRF3与关键的细胞质应激颗粒成分相互作用,包括G3BP1,G3BP2和CAPRIN1.
- TGFβ刺激导致了mt-dsRNA在细胞质中的积累,并组装了含有IRF3的压力颗粒.
- 抑制G3BP1活动或减弱mt-dsRNA减弱的TGFβ诱导的纤维化反应.
结论:
- 一个涉及TGFβ,mt-dsRNA和压力颗粒的新型轴促进IRF3激活和随后的肝星细胞纤维化反应.
- 细胞质压力颗粒成为TGFβ介导肝纤维化中的关键调节枢纽.
- 针对已识别的TGFβ-mt-dsRNA-压力颗粒-IRF3通路,为肝纤维化提供了潜在的治疗策略.
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