オートファージコンポーネントは,アラビドプシスの過敏性細胞死亡に寄与する
Daniel Hofius1, Torsten Schultz-Larsen, Jan Joensen
1Department of Biology, Copenhagen Biocenter, University of Copenhagen, 2200 Copenhagen, Denmark.
Cell
|May 20, 2009
まとめ
オートファギーは生存メカニズムとして作用し,病原体防御中に植物細胞死亡を制限します. オートファジーに欠陥のある突然変異体は,含有病変を示し,植物免疫期間中のプログラム細胞死におけるその役割を明らかにします.
科学分野:
- 植物免疫 植物免疫とは
- 細胞のプロセスは細胞のプロセスです.
- 分子生物学は分子生物学である.
背景:
- オートファギーは,植物の先天性免疫の間にプログラム細胞死 (PCD) を制限する生存のためのメカニズムです.
- 過敏反応 (HR) は,病原体認識によって引き起こされるPCDの一種です.
- 減少したオートファジー遺伝子発現は,HR病変の広がりの増加と関連しています.
研究 の 目的:
- 受容体媒介性HRPCDにおけるオートファギーの役割を調査する.
- オートファギー欠陥アラビドプシス変異体 (atg) のHR反応を分析する.
- オートファジーと異なる免疫受容体経路との関係を決定する.
主な方法:
- アラビドプシスのオートファギー欠陥のノックアウト変異体 (atg) を利用した.
- 感染時に検査された受容体媒介のHRPCD反応.
- Toll/Interleukin-1 (TIR) 型およびcoil-coil (CC) 型免疫受容体によって誘発されたHR細胞死が調査されました.
主要な成果:
- 感染症に起因するHR病変は,以前のモデルとは異なり,ATG変異体にも含まれていた.
- TIR型免疫受容体 (EDS1) によって媒介されるHR細胞死は,ATG変異体において抑制された.
- CC型免疫受容体 (NDR1経由) によって誘発されたPCDは,オートファジーに独立するか,またはオートファージ成分が関与していた.
結論:
- オートファギーはHR PCDに寄与し,特定の文脈でプロ・デス・パスとして作用します.
- オートファジック細胞死は,植物免疫期間の他の細胞死経路と並行して動作することができます.
- HR PCDにおけるオートファギーの役割は,関連する特定の免疫受容体経路に依存しています.
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