双链RNA通过关节动物的Dicer-2/Ampk/FoxO轴诱导抗病毒转录反应
Jie Gao1, Chen-Fei Liu1, Ping-Ping Liu1
1Shandong Provincial Key Laboratory of Animal Cells and Developmental Biology, School of Life Sciences, Shandong University, Qingdao 266237, China.
概括
在双链RNA (dsRNA) 的Dicer-2处理过程中利用ATP水解来触发序列独立的抗病毒防御. 这种机制涉及到ATP的耗尽,激活Ampk和FoxO,提供了新的天生的免疫洞察力.
科学领域:
- 无脊椎动物免疫学 无脊椎动物免疫学
- 分子病毒学分子病毒学.
- 生物化学 生化学
背景情况:
- 无脊椎动物主要使用序列特异性RNA干扰 (RNAi) 来进行抗病毒防御.
- 双链RNA (dsRNA) 触发了序列独立的保护,Dicer-2 是必不可少的,但机制尚不清楚.
研究的目的:
- 阐明无脊椎动物中dsrna诱导的序列独立抗病毒保护背后的机制.
- 调查Dicer-2活动及其相关生化过程的作用.
主要方法:
- 研究了Dicer-2的酶活性,重点关注其酶域和ATP依赖性.
- 监测ATP水平和下游信号通路,包括Ampk激活和FoxO核转移.
- 比较了加工小干扰RNAs (siRNAs) 与未加工的dsRNA对抗病毒反应的影响.
主要成果:
- 通过Dicer-2的dsRNA裂变是依赖ATP的,导致ATP的水解和耗尽.
- 缺少ATP会激活腺单酸活性蛋白激酶 (Ampk).
- 激活的Ampk诱导了福克头盒O (FoxO) 的核定位,这是对抗病毒基因表达至关重要的转录因子.
结论:
- 在中,一种新的,独立于序列的抗病毒机制依赖于Dicer-2的dsRNA处理过程中的ATP水解.
- 这一途径激活Ampk和FoxO,与siRNA介导的RNAi不同.
- 这些发现揭示了独特的先天抗病毒策略,并表明抗病毒免疫的进化联系.
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