細胞アイデンティティスイッチは,残留BCCがヘッジホッグ経路の阻害を生き残ることを可能にします
Brian Biehs1, Gerrit J P Dijkgraaf1, Robert Piskol2
1Department of Molecular Oncology, Genentech, San Francisco, CA, USA.
Nature
|October 10, 2018
まとめ
ヴィスモデジブのようなヘッジホッグ経路阻害剤は,再発する基礎細胞癌 (BCC) の残留腫瘍を残す可能性があります. これらの残留BCCは 幹細胞のようなアイデンティティに切り替わり 治療を回避します
科学分野:
- 腫瘍学
- 皮膚科
- 分子生物学
背景:
- 基礎細胞癌 (BCC) はしばしばヘッジホッグ経路阻害剤で治療されます.
- 治療中止後,残留疾患と再発が起こることがあります.
- 効果的なBCC治療には,耐性メカニズムを理解することが重要です.
研究 の 目的:
- スムージド阻害剤ビスマデジブによる治療後に残留した基礎細胞癌 (BCC) 腫瘍の行動を調べる.
- BCCにおける治療抵抗性の基礎となる細胞および分子メカニズムを解明する.
- 抵抗を克服するための潜在的な治療戦略を特定する.
主な方法:
- 基礎細胞癌 (BCC) のPtch1-Trp53マウスモデルを使用した.
- 腫瘍と観察された残留疾患の治療にヴィスマデジブを投与した.
- 残留と未処理のBCCを比較するために転写プロファイリングを行いました.
- クロマチンの状態と WNT経路の活性化と 超強化器の再プログラム
主要な成果:
- ビスマデジブ治療は静止状態の残留BCCを引き起こし,薬の投与を中止すると再発した.
- 残留BCCは,卵泡間表皮細胞と間溝幹細胞に似たトランスクリプションプログラムを採用した.
- このアイデンティティスイッチは 許容性クロマチンの Wnt経路の活性化と 超強化器の再プログラムを含んでいます
- ビジモデジブとWnt経路阻害剤を併用した治療は,残留腫瘍負担を軽減し,分化を促進した.
結論:
- 腫瘍細胞は,代替的な幹細胞のようなアイデンティティを採用することで,vismodegib治療を回避することができます.
- この抵抗メカニズムは,元の腫瘍発生因子への依存を回避します.
- ヘッジホッグとWntの両方の経路をターゲットにすることで,BCC治療の有効性を高め,再発を予防する戦略を提供することができます.
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