循環型RNAの構造と分解は,先天性免疫におけるPKR活性化を調節する
Chu-Xiao Liu1, Xiang Li1, Fang Nan2
1State Key Laboratory of Molecular Biology, Shanghai Key Laboratory of Molecular Andrology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031, China.
Cell
|April 30, 2019
まとめ
循環型RNA (circRNAs) は,先天的な免疫酵素PKRを阻害する安定した分子である. 早期の免疫反応には 降解が不可欠で 減少はSLEのような 自己免疫疾患と関連しています
科学分野:
- 分子生物学
- 免疫学
- 遺伝学
背景:
- 円形RNA (circRNAs) は豊富であるが,その機能はほとんど不明である.
- circRNAは,線形RNAと異なるユニークな構造を有しています.
- 生まれつきの免疫と自己免疫疾患における彼らの役割は 新興の研究分野です
研究 の 目的:
- 本来の免疫における内生性circRNAの機能を調査する.
- circRNAs,PKR活性化,および全身性白血病 (SLE) の間の関係を調査する.
主な方法:
- 固有のcircRNA構造とPKRとの相互作用の分析
- 免疫刺激中にRNase LによるcircRNAの分解を調査する.
- SLE患者の周辺血液単核細胞 (PBMC) のcircRNAおよびPKRレベルを定量化する.
主要な成果:
- 内生的なcircRNAは不完全なRNA複合体を形成し,二重鎖RNA (dsRNA) 活性化タンパク質キナーゼ (PKR) を阻害する.
- circRNAsは,PKR活性化を促進する,ポリ (I: C) 刺激またはウイルス感染時にRNase Lによって分解されます.
- SLE患者では,PBMCで circRNAsが減少し,PKRのリン酸化が増加している.
- SLE由来細胞でdsRNAを含むcircRNAを過剰発現すると,異常PKR活性化が改善される.
結論:
- circRNAsはPKRの内生性阻害体として機能し,先天的免疫において重要な役割を果たします.
- 細胞の早期抗ウイルス反応において, circRNAの分解は重要なステップです.
- circRNAsとPKRの活性化がSLEの病原性に関与している.
- サークRNAはSLEのような自己免疫疾患の潜在的治療標的である.
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