ストレス・グラニュル・アセンブリ 核細胞質輸送を妨害する
Ke Zhang1, J Gavin Daigle1, Kathleen M Cunningham2
1Department of Neurology, School of Medicine, Johns Hopkins University, Baltimore, MD 21205, USA; Brain Science Institute, School of Medicine, Johns Hopkins University, Baltimore, MD 21205, USA.
Cell
|April 10, 2018
まとめ
細胞のストレスは,ALSやFTDのような神経変性疾患において,ストレス粒子を形成することで,核細胞質の輸送を妨げます. 例えばアタキシン2を標的としてこれらの粒子を抑制すると,輸送障害や神経変性が予防できます.
科学分野:
- 神経科学
- 分子生物学
- 遺伝学
背景:
- 核サイトプラズマの輸送欠陥は,アミオトロフィック横筋硬化症 (ALS) とフロントテンポラル認知症 (FTD) の主要な原因であり,しばしばC9ORF72の再発拡大に関連しています.
- 他の神経変性疾患におけるタンパク質の集積は,共有された病原性メカニズムとして,中断された核細胞質輸送を示唆している.
研究 の 目的:
- C9ORF72媒介のALS/FTDの文脈で細胞ストレスが核細胞質輸送にどのように影響するかを調査する.
- ストレス粒子の分子結合と神経変性における核細胞質輸送欠陥を特定する.
主な方法:
- 細胞のストレス条件下での核細胞質輸送因子の局所化を調べた.
- 核細胞プラズマ輸送障害におけるストレス粒子の役割を調査した.
- C9ORF72-ALS/FTDモデルにおいて,ストレス粒子の組成を抑制する治療的可能性を評価した.
主要な成果:
- 細胞のストレスにより,重要な核細胞質輸送因子がストレス粒に蓄積される.
- ストレス粒子は核細胞の輸送を妨害する直接的な要因である.
- ストレス粒子の形成を抑制し,特にアタキシン-2レベルを低下させることで,C9ORF72-ALS/FTDにおける核細胞質輸送欠陥と神経変異を改善します.
結論:
- C9ORF72媒介のALS/FTDにおけるストレス粒子の組成と核細胞質輸送機能障害の間の直接的な関連が確立された.
- ストレス粒子はALS/FTDおよびタンパク質ストレスを含む他の潜在的神経変性疾患の重要な治療目標として強調されています.
- C9ORF72-ALS/FTDの主要な病理的特徴を緩和することが示された.
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