ERストレスは,S1Pのカスパース-2活性化によるリポゲネシスとステアトヘパチスを誘発する
Ju Youn Kim1, Ricard Garcia-Carbonell1, Shinichiro Yamachika1
1Laboratory of Gene Regulation and Signal Transduction, Departments of Pharmacology and Pathology, University of California San Diego, School of Medicine, La Jolla, CA 92093, USA.
Cell
|September 18, 2018
まとめ
カスパース2の活性化により,非アルコール性脂肪肝疾患 (NAFLD) が非アルコール性脂肪肝炎 (NASH) に進行し,自由コレステロールが増加します. カスパース2を阻害することで,NASHの発症を防ぐことができる.
科学分野:
- ヘパトロジー
- 分子生物学
- 生物化学
背景:
- 非アルコール性脂肪肝 (NAFLD) は,エンドプラズマ網膜 (ER) のストレスにより非アルコール性脂肪肝炎 (NASH) に進行することがあります.
- NASHの進行は,デノボリポゲネシスを伴う単純なステアトーシスとは異なり,肝細胞のフリーコレステロールの蓄積と関連しています.
研究 の 目的:
- NASHの進行中の肝臓のフリーコレステロールとトリグリセリドの蓄積におけるカスパース-2の役割を調査する.
- NASHの潜在的な治療目標とバイオマーカーとしてカスパース-2を調査する.
主な方法:
- 人間とマウスのNASHモデルにおけるカスパース-2発現を調べた.
- サイト1プロテアゼ (S1P) とカスパース-2の相互作用とそのステロール調節要素結合タンパク質 (SREBP) への作用を調査した.
- ダイエット誘発のNASHモデルにおいて,カスパース-2除去と薬理学的抑制を活用した.
主要な成果:
- カスパース2発現はERストレス誘発性であり,NASHでは上昇する.
- カスパース2はSCAPとは独立してS1Pを分裂させ,コレステロールとトリグリセリドの蓄積につながります.
- カスパース2抑制は,食事によるステアトーシスとNASHの進行をマウスで防止した.
結論:
- カスパース2は,肝臓のフリーコレステロールとトリグリセリドのレベルを制御することによって,NASHの進行を促す上で重要な役割を果たします.
- ストレスに起因する脂肪肝疾患の治療や予防に 有望な戦略です
- カスパース2で生成されたS1P断片は,NASHの潜在的なバイオマーカーです.
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