HTLV-1トランザクティベータは,NF-kappa B型因子を通してインタールイキン-2受容体発現を誘導する
1Howard Hughes Medical Institute, University of Michigan Medical Center, Department of Internal Medicine, Ann Arbor 48109.
Nature
|June 23, 1988
まとめ
Tリンパ性ヒトウイルスI (HTLV-I) のタットタンパク質は,NF-カッパB型転写因子と相互作用することで,インタールユーキン-2受容体α (IL-2Rα) の発現を誘導する. この相互作用は,ヒト免疫不全ウイルス-1 (HIV-1) がNF-カッパBを使用する方法と似ています.
科学分野:
- ウイルス学 ウイルス学 ウイルス学
- 分子生物学は分子生物学である.
- 免疫学 免疫学とは
背景:
- ヒトTリンパ性ウイルスI (HTLV-I) は霊長類の細胞に感染し,宿主タンパク質の産生を刺激する.
- HTLV-Iに感染したT細胞は,おそらくウイルスのtat-I遺伝子産物によって媒介されるインターレウキン-2受容体α (IL-2Rα) 鎖を合成する.
- 活性化されたT細胞は,転写因子NF-kappa Bを利用して,特定の増強剤配列を介してヒト免疫不全ウイルス-1 (HIV-1) の発現を強化します.
研究 の 目的:
- HTLV-I tat-I遺伝子産物がIL-2Rアルファ発現を誘発するメカニズムを調査する.
- NF-kappa Bに類似する転写因子が,HTLV-I tat-I媒介のIL-2Rα誘導に関与しているかどうかを判断する.
- IL-2Rアルファ遺伝子発現におけるtat-I反応に起因する特定のDNA配列を特定する.
主な方法:
- 配列解析は,IL-2Rアルファ遺伝子の上流の潜在的な規制要素を特定するために行われます.
- エレクトロフォレティック・モビリティ・シフト・アッセイは,同定された配列に結合する転写因子を評価するためのものです.
- レポーター遺伝子アッセイは,タットI応答性をテストするために,識別された配列のコピーが挿入された異質なプロモーターを使用して行われます.
主要な成果:
- IL-2Rαのアップストリーム配列が特定され,NF-カッパB結合部位 (カッパB) と有意なホモロジーを共有しました.
- この識別された配列は,カッパB部位への結合に競争し,プロモーターの上流でマルチメリ化されると,タットI応答要素として機能する.
- tat-I製品は,感染した細胞におけるカッパB結合活性とIL-2RアルファカッパB結合活性の両方を誘発することが示されました.
結論:
- HTLV-I tat-IはNF-kappa B型転写因子と相互作用し,IL-2Rα発現を誘発する.
- HTLV-IとHIV-1は,NF-kappa B型因子を含む同様の転写因子経路を利用しています.
- これらの発見は,ウイルス感染症中に成長因子受容体遺伝子発現を調節するNF-カッパB型因子の潜在的な役割を示唆しています.
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