SHIPまたはSHP-1の削除は,抑制信号伝達の2つの異なる経路を明らかにします
1Laboratory of Molecular Genetics and Immunology, The Rockefeller University, New York, New York 10021, USA.
Cell
|July 25, 1997
まとめ
免疫抑制コアレセプターは,シグナル伝達のために,SHP-1 (SH2を含むイノシトール・フォスファタゼ1) またはSHIP (SH2を含むイノシトール・フォスファタゼ) という異なるフォスファタゼを利用する. この選択的募集は,B細胞受容体誘発のアポトーシスの結果を決定する.
科学分野:
- 免疫学 免疫学とは
- 細胞シグナル伝達 細胞信号伝達
- 分子生物学は分子生物学である.
背景:
- 抑制性核受容体は,免疫受容体の活性化を調節する.
- イノシトールポリリン酸5'-リン酸塩 (SHIP) とチロシンリン酸塩SHP-1は,重要なシグナル伝達分子である.
- 阻害信号伝達経路におけるそれらの特定の役割は,まだ完全に解明されていない.
研究 の 目的:
- 免疫抑制信号伝達におけるSHIPとSHP-1の必要性,相互作用,冗長性を調査する.
- これらのフォスファタゼによって媒介される抑制反応の異なるクラスを定義する.
- B細胞受容体 (BCR) 誘発によるアポプトシスへの影響を理解するために.
主な方法:
- SHP-1欠乏症およびSHIP欠乏症のB細胞系を生成する.
- これらの細胞系における抑制信号伝達能力の評価.
- レセプターエンゲージメントに反応したBCR誘発のアポトーシスの分析.
主要な成果:
- 抑制反応の2つの異なるクラスが特定され,選択的にSHP-1またはSHIPを募集しました.
- FcガンマRIIB媒介の阻害信号は,SHP-1ではなく,SHIPを必要とします.
- KIR媒介の阻害信号は,SHIPではなく,SHP-1を必要とします.
- SHP-1のシグナリングはアポトーシスをブロックし,SHIPのシグナリングはFc gammaRIIBによって開始されたプロアポトーシス信号を弱める.
結論:
- SHIPとSHP-1は,抑制性核受容体シグナル伝達を媒介する際の,異なる非冗長な役割を担っています.
- これらのフォスファタゼの選択的徴募は,細胞の結果,特にBCR誘発のアポトーシスを決定する.
- この選択的徴募は,免疫反応を微調整するメカニズムを提供します.
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