オートファジー・プロテアゼ ATG4Dは,骨肉腫細胞の増殖と悪性化を促進する
Pei-Feng Liu1,2,3, Shan-Wei Yang4, Wen-Hsin Yang5
1Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung, Taiwan.
まとめ
オートファギーのプロテアゼであるATG4Dをターゲットにすることで,骨髄腫の治療に期待できる. ATG4Dを静止すると,腫瘍の成長や転移を抑制し,小児がんの化学療法に対する感受性を高めます.
科学分野:
- 腫瘍学
- 分子生物学
- 細胞生物学
背景:
- オステオサルコマは,転移した症例の生存率が低い一般的な小児がんです.
- ATG4プロテアゼによって調節されるオートファギーは,癌において役割を果たしますが,骨肉腫におけるその機能は不明です.
- 骨髄腫患者の治療結果を改善するには 新しい治療目標が不可欠です
研究 の 目的:
- オステオサルコマにおけるATG4プロテアースファミリーの役割を調査する.
- ATG4ファミリーのメンバーが骨肉腫の治療標的として機能するかどうかを判断する.
主な方法:
- 小型の干渉RNA (siRNA) と短いヘアピンRNA (shRNA) を用いて,骨肉腫細胞のATG4ファミリーメンバーを静止させました.
- 細胞サイクル,アポトーシス,移住,侵入,腫瘍球形成の測定を行った.
- 臨床的骨肉腫組織の分析とインビオの異種移植マウスモデルを使用した.
主要な成果:
- 細胞サイクル停止と細胞死を引き起こした.
- ATG4Dのノックダウンにより,骨肉腫細胞の移動,侵入,腫瘍球の形成が著しく減少しました.
- ATG4Dの減少は,自己死性のマーカーを高め,飢餓と化学療法に対する細胞の感受性を高め,腫瘍の成長を減少させ,アポトーシスをインビボで増加させた.
- オステオサルコマの組織におけるATG4D発現の上昇は,特に高齢の患者および下肢腫瘍を有する患者の生存率の低下と相関する.
結論:
- ATG4Dは,細胞の運動性と生存を含む,骨肉腫の進行において重要な役割を果たします.
- ATG4Dの抑制は,骨肉腫の治療の可能性を示しています.
- ATG4Dは,骨肉腫の診断バイオマーカーおよび治療標的として機能する.
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