RIG-I媒介による5'-二リン酸塩を含むRNAの認識による抗ウイルス免疫
Delphine Goubau1, Martin Schlee2, Safia Deddouche1
1Immunobiology Laboratory, Cancer Research UK, London Research Institute, 44 Lincoln's Inn Fields, London WC2A 3LY, UK.
Nature
|August 15, 2014
まとめ
RIG-I (レチノ酸誘導性遺伝子I) は,5'-二リン酸 (5'pp) を含むウイルスRNAを認識し,先天的免疫におけるその役割を拡大する. この発見は,細胞がウイルス侵入者を自己細胞と区別する方法の理解を深める.
科学分野:
- 生まれながらの免疫力
- 分子ウイルス学 分子ウイルス学
- RNAセンシング RNAセンシング
背景:
- 哺乳類の細胞は,RIG-IとMDA5を含むRIG-I型受容体 (RLR) を用いて,細胞細胞内のウイルスRNAを検出する.
- RIG-Iは,通常,5'-トリフォスファート (ppp) 末端と鈍い末端の塩基配列の領域を持つウイルスRNAを感知します.
- RIG-Iの活性化は,抗ウイルス防御に不可欠なタイプIインターフェロン産生につながるシグナルカスケードを開始します.
研究 の 目的:
- RIG-Iが5'-二酸化塩素 (5'pp) terminiを持つウイルスRNAに対する抗ウイルス反応を媒介できるかどうかを調査する.
- 5'-ppp RNAを超えたRIG-I認識のための最小のRNA構造要件を決定する.
主な方法:
- RIG-Iと様々な5'pp-RNA (リオウイルス,酵母 L-Aウイルス,インビトロ転写,化学合成) を用いた結合分析.
- 5'pp-RNAに対するRIG-I依存の抗ウイルス反応を評価するための機能検査.
- 培養細胞とマウスの感染研究で,レオウイルス感染症の制御におけるRIG-Iの役割を評価する.
主要な成果:
- RIG-Iは,レオウイルスゲノムや酵母L-AウイルスRNAを含む5'pp末端のウイルスRNAに結合し,活性化します.
- 塩基配列5'pp-RNAは,起源に関係なく,RIG-Iアゴニストとして機能する.
- RIG-Iに依存するレオウイルス感染の制御は,細胞培養とマウスモデルの両方で不可欠です.
結論:
- RIG-I認識の最小決定因子は,5'-二酸化塩素 (5'pp) 部分を持つ塩基配列RNAである.
- 5'pp-RNAの認識は,RIG-Iによって検出されるウイルス構造のレパートリーを拡大します.
- この発見は,5'pp-RNAの認識を,ウイルス病原体に対する先天性免疫自己/非自己差別のための重要なメカニズムとして強調しています.
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