MDA5ISGylation对于免疫信号来控制病毒复制和病变发生至关重要
Lucky Sarkar1, GuanQun Liu1, Dhiraj Acharya1
1Florida Research and Innovation Center, Cleveland Clinic, Port St. Lucie, FL 34987, USA.
bioRxiv : the preprint server for biology
|October 10, 2024
概括
通过ISGylation对黑色素瘤分化相关蛋白5 (MDA5) 的翻译后修饰 (PTM) 对抗病毒免疫至关重要. 突变MDA5ISGylation位点在小鼠免疫反应受损和病毒感染的死亡率增加.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 病毒学 病毒学
背景情况:
- 天生的免疫传感器的翻译后修饰 (PTM) 调节了抗病毒反应.
- 黑色素瘤分化相关蛋白5 (MDA5) 在其CARD域中的ISGylation促进信号传递,但其体内相关性尚不清楚.
研究的目的:
- 为了研究MDA5ISGylation在抗病毒免疫中的体内作用.
- 为了确定负责MDA5ISGylation的E3链酶.
主要方法:
- 产生了具有突变MDA5ISGylation位点 (K23,K43) 的 knock-in小鼠.
- 评估了对RNA激动剂和病毒感染 (EMCV,WNV) 的细胞反应.
- 分析了小鼠的生存率,病毒载荷和细胞因子/化学因子诱导.
- 通过分子研究确定了E3链酶.
主要成果:
- 缺乏MDA5ISGylation的细胞显示MDA5的寡合化受损,细胞因子反应减弱.
- 在EMCV感染后,MDA5 ISGylation缺乏的小鼠表现出增加的死亡率,更高的病毒标位,以及降低的细胞因子/化学因子诱导.
- HERC5和HERC6被确定为MDA5ISGylation的主要E3酶.
结论:
- 卡德ISGylation对于MDA5介导的RNA病毒的限制至关重要.
- 这些发现凸显了MDA5ISGylation作为抗病毒和抗炎药物开发的目标.
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