Atg16l1のクローン病変体は,カスパース3による分解を強化する
Aditya Murthy1, Yun Li1, Ivan Peng1
1Department of Immunology, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, USA.
Nature
|February 21, 2014
まとめ
クローン病の一般的なリスク遺伝子変種 (ATG16L1 T300A) は,カスパース-3分裂に対してより敏感である. これは,オートファギーの減少と病原体のクリアランスの低下につながり,クローン病の発症に寄与します.
科学分野:
- 遺伝学と分子生物学について
- 免疫学 免疫学とは
- 胃腸内科 胃腸内科
背景:
- クローン病は,ATG16L1遺伝子変種 (rs2241880,Thr300Ala) と関連している炎症性腸疾患です.
- このクローン病に関連したATG16L1変異体の正確な分子影響は不明のままである.
研究 の 目的:
- ATG16L1遺伝子におけるThr300Ala (T300A) 変異の分子的影響を調査する.
- ATG16L1の処理におけるカスパース3の役割とそのクローン病の病原性との関連を解明する.
主な方法:
- ATG16L1.1.におけるカスパース割れ模様の分析
- ストレス状態 (死亡受容体の活性化,飢餓) の下でのヒトとマウリンのマクロファージの実験.
- T316A変異体 (T300Aのマウイン ekvivalent) を宿すノックインマウスを利用し,遺伝子削除/変異 (Casp3) を用いた.
主要な成果:
- T300Aの変種は,CASPASE-3分裂に対するATG16L1の感受性を高めています.
- 細胞のストレスは,T300A/T316A ATG16L1変種の分解を加速し,オートファギーを減少させます.
- T316Aマウスは,Yersinia enterocoliticaのクリアランスが低下し,炎症反応が高まっている.
結論:
- カスパース3の活性化は,一般的なクロン病リスクアレルの存在において,ATG16L1の分解を加速する.
- この加速された分解は,細胞のストレス,アポトーシス,および障害のあるオートファギーを,クローン病への予備性のある経路で結びつける.
- カスパース3または割れ部位を標的とした治療は,クローン病の治療戦略を提供することができる.
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