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在蛇头Channa argus中识别和功能性表征cGAS和cGAS类
Hong Qing Zhang1, Long Wei Cai1, Yu Hang Deng2
1School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China.
Fish & shellfish immunology
|July 16, 2025
概括
蛇头鱼具有循环GMP-AMP合成酶 (cGAS) 和cGAS类 (cGASL) 蛋白质,参与抗病毒免疫. cGAS促进I型干扰素的产生,而cGASL抑制它,显示出复杂的免疫调节.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 鱼类生物学 鱼类生物学
背景情况:
- 循环GMP-AMP合成酶 (cGAS) 是哺乳动物细胞质dDNA的关键传感器,通过刺痛信号发射启动I型干扰素 (IFN) 反应.
- 鱼类抗病毒免疫中cGAS及其同类cGAS类 (cGASL) 的精确调节功能在很大程度上仍未被描述.
研究的目的:
- 研究cGAS和cGASL在蛇头鱼 (Channa argus) 中的识别和功能作用.
- 阐明cGAS和cGASL调节抗病毒免疫通路的独特机制,特别是I型IFN和RLR信号.
主要方法:
- 在Channa argus中识别和表征cGAS和cGASL基因.
- 分析蛋白质域组织,包括NTase,MAB21和跨膜域.
- 在EPC细胞中进行同传染实验,以评估cGAS和cGASL对IFN刺激基因 (ISG) 和RLR通路组件 (tbk1,mda5) 的影响.
主要成果:
- 标识了蛇头cGAS和cGASL蛋白质,cGASL具有额外的跨膜域.
- 发现cGAS结合了Sting,增强了I型IFN和ISG的产生,需要其完整的域结构才能发挥作用.
- 与tbk1和mda5同时表达cGAS或cGASL导致ISG表达的抑制.
- cGAS表现出双重功能,促进了依赖刺的IFN反应,同时也抑制了RLR通路激活.
- cGASL仅作为RLR通路的抑制剂起作用.
结论:
- 蛇头鱼中的cGAS和cGASL在抗病毒免疫中表现出独特而复杂的免疫调节作用.
- cGAS 作为双重调节器,通过 Sting 促进 IFN 生产,并抑制 RLR 信号传输.
- cGASL主要作为RLR通路的抑制剂起作用.
- 这些发现突出了鱼类中cGAS/cGASL的特定免疫调节途径,扩大了我们对先天抗病毒防御机制的理解.
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