肝臓腫瘍発生におけるMYCNの腫瘍性機能と転写ダイナミクス
Xian-Yang Qin1, Yali Xu1, Hricha Mishra1
1Laboratory for Cellular Function Conversion Technology, RIKEN Center for Integrative Medical Sciences, Yokohama, Kanagawa 230-0045, Japan.
まとめ
MYCNは,腫瘍を促進する微小環境を作り出すことによって,肝がんを駆動します. 非腫瘍組織におけるMYCNを用いた新しいスコアは,肝細胞がんの再発リスクを予測することができます.
科学分野:
- 腫瘍学 腫瘍学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 肝細胞癌 (HCC) は,がんによる死亡の主な原因であり,しばしば遅れて診断され,再発率が高くなります.
- 肝臓の微小環境のストレスとがんの発症の間の分子的関連は完全に理解されていません.
- プロトオンコゲンであるMYCNは,がんの幹性を示す可能性があるが,肝がんにおけるその役割は不明である.
研究 の 目的:
- 肝臓腫瘍発生におけるMYCNの腫瘍性作用を調査する.
- MYCNが肝がんの発症時にどのように転写的に調節されるかを理解する.
- 腫瘍マイクロ環境におけるMYCNの役割と,ヒトHCCにおける臨床的関連性を特定する.
主な方法:
- MYCN過剰発現のためにマウスの尾静脈注射ベースの水力動力トランポゾンシステムを利用しました.
- 腫瘍の発達を分析するために,トランスクリプトミクスと時間分解の空間トランスクリプトミクスを行いました.
- 人間のHCCコホートにおける機械学習ベースのMYCNニッチスコアを開発し,検証しました.
主要な成果:
- AKTの活性化と組み合わせたMYCN過剰発現は,マウスの肝臓腫瘍形成を促した.
- MYCN駆動腫瘍は,ヒトHCCサブタイプに似たストレス適応型転写プログラムを示した.
- エピテリアル-メゼンキマトランジション (EMT) とWnt/β-カタニンシグナル伝達を持つMYCNに富んだニッチが特定され,腫瘍進行中に拡大されました.
- MYCNのニッチスコアは,再発リスクを予測し,ヒトHCCにおけるEMTに弱い微小環境を特定し,非腫瘍組織ではより良いパフォーマンスを示した.
結論:
- MYCNは,肝がんにおける腫瘍促進微環境の機能的誘導体および空間的マーカーとして作用する.
- MYCNニッチスコアは,腫瘍以外の肝臓組織のトランスクリプトミクスを分析することによって,高リスクのHCC患者を特定するための臨床的に実行可能な戦略を提供します.
- このアプローチは,新しい腫瘍が発症しやすいがん前ニッチを検出するのに役立ちます.
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