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Assays for the Degradation of Misfolded Proteins in Cells
Published on: August 28, 2016
ポリグルタミンプレアミロイドオリゴマーの心筋筋細胞発現は,心不全を引き起こす
J Scott Pattison1, Atsushi Sanbe, Alina Maloyan
1Department of Pediatrics, Division of Molecular Cardiovascular Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA.
Circulation
|May 21, 2008
まとめ
心臓細胞内で発現する溶性プレアミロイドオリゴーマー (PAO) は,マウスにおいて毒性と心不全を引き起こす. この研究は,PAOが心臓機能不全と細胞死を引き起こすのに十分であることを確認し,その病原性の役割を強調しています.
科学分野:
- 心血管生物学 心血管生物学
- 神経変性疾患のメカニズム 神経変性疾患のメカニズム
- 分子毒理学 分子毒理学
背景:
- 溶性プレアミロイドオリゴーマー (PAO) は神経毒性に関与しており,ヒトの心不全サンプルで観察されています.
- 長いポリグルタミン (PQ) リピート (>50) はPAOを形成し,ハンティントン病のような神経変性疾患に関連しています.
研究 の 目的:
- 細胞内で発現する溶性プレアミロイドオリゴマー (PAO) の細胞毒性を研究する.
- 心筋細胞に制限されたPAOの蓄積が心不全を引き起こすのに十分であるかどうかをテストする.
主な方法:
- 83残留のPQリピート (PQ83) または非病原性19残留のPQコントロール (PQ19) のいずれかの心筋細胞自律的な発現を持つトランスジェニックマウスを生成した.
- PQ83とPQ19を発現したマウスの心臓機能,形態,寿命の比較.
- PQ83タンパク質の蓄積,アグレソーム形成,細胞死とオートファジー/リソソーム経路のマーカーを分析した.
主要な成果:
- PQ83を発現したマウスは,心臓機能の低下,膨張,および死亡率を8ヶ月後に発症した.
- PQ19対照マウスは正常な心機能,形質,寿命を維持した.
- PQ83タンパク質がアグレソームに蓄積され,心臓はオートファジー/リソソームマーカーと死滅性細胞死亡指標の増加を示しています.
結論:
- この研究は,心筋細胞における外因的なPAO形成ペプチドの発現が有毒であることを確認した.
- 心筋細胞制限によるPAO発現は,ネズミのモデルで心筋細胞損失と心不全を誘発するのに十分である.
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