活性化されたT細胞の核因子には,FosとJunが含まれています
J Jain1, P G McCaffrey, V E Valge-Archer
1Division of Tumor Virology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115.
Nature
|April 30, 1992
まとめ
FosおよびJunタンパク質を含む転写因子AP-1は,NF-ATの新たに合成された核成分である. この発見は,T細胞におけるNF-ATの2段階の活性化プロセスを明らかにしています.
科学分野:
- 免疫学 免疫学とは
- 分子生物学は分子生物学である.
- セルラー・シグナリング
背景:
- 活性化されたT細胞の核因子 (NF-AT) は,T細胞におけるインタールイキン-2 (IL-2) 遺伝子誘導に不可欠である.
- NF-ATは,サイクロスポリンA (CsA) やFK506.6のような免疫抑制薬の主要標的である.
- NF-AT誘導には,CsA感受性およびCsA耐性活性化ステップが含まれています.
研究 の 目的:
- NF-AT.の新たに合成された核成分を特定する.
- T細胞におけるNF-AT活性化の基礎となる分子メカニズムを解明する.
- NF-ATコンポーネント間の相互作用を特徴付けるために.
主な方法:
- タンパク質とDNAの結合を研究するための電泳運動シフトアッセイ (EMSA)
- 特定のタンパク質を検出するためのウェスタン・ブラッティング (Fos, Jun).
- 機能的相互作用を検証するための再構成および共伝染実験.
主要な成果:
- NF-ATの誘導可能な核形態は,FosとJunタンパク質で構成され,AP-1を合成成分として識別します.
- 刺激されていないT細胞で,以前に存在していたNF-AT結合因子が特定されました.
- NF-ATの活性化には,CsAに敏感な既存の因子の改変/転位,その後CsAに敏感でないAP-1 (Fos/Jun) の添加が伴う.
結論:
- 転写因子AP-1は,NF-ATの新たに合成された成分です.
- NF-ATの活性化は,既にある因子と新たに合成された因子の両方を含む多段階のプロセスです.
- この発見は,T細胞活性化と免疫抑制の標的のより深い理解を提供します.
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