复合到双链RNA的LL37诱导RIG-I类受体信号和Gasdermin E激活,促进IL-36γ从角质细胞释放
Jennifer Keller1, Judit Danis1,2,3, Isabella Krehl1
1Department of Dermatology, University Hospital Zürich (USZ), University of Zürich (UZH), Raemistrasse 100, 8091, Zürich, Switzerland.
Cell death & disease
|March 23, 2025
概括
角质细胞通过涉及双链RNA (dsRNA) 和LL37的不同途径释放Interleukin-36 gamma (IL-36γ). 这些机制,包括Gasdermin E孔隙形成或炎症酶激活,影响IL-36γ处理和牛皮病原体.
科学领域:
- 免疫学 免疫学 免疫学
- 皮肤病学 皮肤病学
- 细胞生物学 细胞生物学
背景情况:
- 介素-36 (IL-36) 细胞因子对于表皮屏障和适应性免疫的炎症反应至关重要.
- IL-36细胞因子,是Interleukin-1超级家族的一部分,缺乏信号,需要细胞外蛋白质分解才能具有生物活性.
- IL-36家族在牛皮病原发生中的作用已确立,但角质细胞释放机制和刺激仍然不清楚.
研究的目的:
- 研究从人类初级角质细胞中释放IL-36γ的机制.
- 阐明核酸,特别是双链RNA (dsRNA) 和LL37在IL-36γ释放中的作用.
- 了解状细胞中的不同dSRNA感知通路如何影响IL-36γ处理和炎症反应.
主要方法:
- 用dsRNA和/或LL37刺激人类初级角质细胞.
- 信号通路的分析,包括RIG-I类受体和NLRP1炎症酶激活.
- 对Caspase-3,Gasdermin E (GSDME) 和Gasdermin D (GSDMD) 的裂变和孔隙形成进行评估.
- 评估IL-36γ的释放和细胞外处理.
- 用皮病相关的细胞因子IL-17A和IFNγ.
主要成果:
- LL37/dsRNA复合体通过RIG-I-like受体信号传递,Caspase-3和GSDME孔隙形成诱导IL-36γ从角质细胞释放,这在很大程度上独立于细胞死亡.
- 直接的dsRNA转染激活NLRP1炎症体,导致IL-36γ表达和释放以GSDMD-依赖的方式,加上炎症体相关的细胞死亡和细胞外蛋白酶活性.
- 牛皮相关的细胞因子IL-17A和IFNγ增强了LL37/dsRNA诱导的IL-36γ释放.
- 独特的dsRNA感知途径触发了差异性的IL-36γ释放机制,影响了其处理和生物活性.
结论:
- 角质细胞通过不同的dsRNA感应途径释放IL-36γ,要么通过GSDME介导的释放,要么通过细胞外分裂的炎症酶激活.
- dsRNA刺激的背景决定了IL-36γ是否以需要中性粒细胞处理的无活性前形式释放,或作为生物活性细胞因子.
- 这些发现揭示了皮细胞中IL-36γ调节的新机制,与牛皮等炎症性皮肤疾病的发病相关.
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