小分子はTMED9を標的とし,タンパク質病変を逆転させるためのリソソーム分解を促進する
Moran Dvela-Levitt1, Maria Kost-Alimova2, Maheswarareddy Emani1
1Broad Institute of MIT and Harvard, Cambridge, MA, USA; Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA.
Cell
|July 27, 2019
まとめ
新しい小分子BRD4780は,TMED9受容体を標的にして,毒性Mucin 1腎疾患 (MKD) のタンパク質集積物を除去する. この発見は,MKDやその他のタンパク質病変の治療戦略に希望を示しています.
科学分野:
- 腎臓科
- 分子生物学
- 生物化学
背景:
- 毒性タンパク質病は,標的治療が欠け,細胞内でのタンパク質の誤折り蓄積によるものです.
- ミュチン1型腎臓病 (MKD) は,MUC1遺伝子フレームシフト変異 (MUC1- fs) によって引き起こされ,毒性の細胞内蓄積を引き起こします.
- ATF6展開タンパク質応答 (UPR) 経路は,MUC1- fsの蓄積によって活性化されます.
研究 の 目的:
- Mucin 1 腎臓病 (MKD) の治療戦略を特定する.
- MUC1-fsの細胞内蓄積とクリアランスのメカニズムを調査する.
- 誤った折りたたみのタンパク質の密輸における 貨物受容体の役割を調査する
主な方法:
- MUC1-fsをクリアする小分子のスクリーニング
- 患者の細胞とノックインマウスのモデルと 腎臓のオルガノイドを用いて
- BRD4780,MUC1-fs,およびTMED9貨物受容体の相互作用を調査する.
主要な成果:
- BRD4780は患者の細胞,マウスの腎臓,および器官からMUC1- fsを効果的に除去します.
- MUC1- fsは,初期の分泌経路内のTMED9を含む膀に隔離されます.
- BRD4780はTMED9と結合し,MUC1- fsをリゾソーム分解のために放出し,TMED9の消去効果を模倣する.
結論:
- BRD4780は,ムシン1型腎臓病 (MKD) の有望な治療薬である.
- この研究は,負荷受容体によって 誤った折りたたまれたタンパク質を 捕まえる新しいメカニズムを明らかにしています
- TMED9を標的にすることは,有毒なタンパク質病変において,誤った折りたたまれたタンパク質を放出し,分解するための戦略を提供します.
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