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Monitoring ER/SR Calcium Release with the Targeted Ca2+ Sensor CatchER+
Published on: May 19, 2017
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STIM1はCa2+センサで,CRACチャネルを活性化し,Ca2+貯蔵所からプラズマ膜に移動します
Shenyuan L Zhang1, Ying Yu, Jack Roos
1Department of Physiology and Biophysics and Center for Immunology, University of California, Irvine, California 92697, USA.
Nature
|October 7, 2005
まとめ
蓄積されたカルシウム (SOC) の流入は,細胞シグナル伝達に不可欠です. STIM1は,カルシウムセンサとして作用し,貯蔵庫が枯渇すると,血膜に移動して,カルシウム放出活性カルシウム (CRAC) チャンネルを活性化します.
科学分野:
- 細胞生物学 細胞生物学
- 免疫学 免疫学とは
- 分子生物学は分子生物学である.
背景:
- 蓄積されたカルシウム (SOC) の流入は,興奮不可能な細胞における重要なCa2+の侵入経路である.
- Tリンパ球内のカルシウム放出活性カルシウム (CRAC) チャンネルは,免疫反応,遺伝子発現,増殖に不可欠です.
- SOCとCRACチャネルの分子同一性とゲーティングメカニズムは,ほとんど不明のままである.
研究 の 目的:
- SOCとCRACチャネルの分子同一性とゲーティングメカニズムを解明する.
- CRACチャネル活性化におけるSTIM1の役割を調査する.
- Ca2+貯蔵庫の枯渇とSOCの流入の間の欠けているリンクを特定する.
主な方法:
- STIMまたはSTIM1.1のEFハンド変異体の発現
- 免疫光顕微鏡. 免疫光顕微鏡. 免疫光顕微鏡. 免疫光顕微鏡. 免疫光顕微鏡.
- 電子顕微鏡 (EM) ローカライゼーション.
- 表面バイオチニレーションアッセイ.
主要な成果:
- 構成的に活性化されたCRACチャネルのStimまたはSTIM1のEF-ハンド変異体の発現は,Ca2+貯蔵量を変えることなく.
- STIM1は,Ca2+貯蔵庫の枯渇により,エンドプラズマ網膜のような部位からプラズマ膜に転位した.
- STIM1はCa2+センサとして機能し,Ca2+貯蔵庫の枯渇とSOCの流入を結びつける.
結論:
- STIM1はCRACチャネル活性化の重要な構成要素であり,Ca2+センサとして機能します.
- Ca2+貯蔵庫の枯渇時に,STIM1のプラズマ膜への転位は,SOCの流入に極めて重要です.
- この研究では,STIM1が,貯蔵室で作動するカルシウム流入経路の欠けているリンクであると特定しています.
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