エピジェネティック・セラピーは,転移前のニッチを破壊することによって転移を抑制する
Zhihao Lu1,2,3, Jianling Zou2, Shuang Li2
1Department of Surgery, The Johns Hopkins University School of Medicine, Baltimore, MD, USA.
Nature
|February 28, 2020
まとめ
低用量エピジェネティックセラピーは,転移前の微環境を形成する,骨髄系由来抑制細胞 (MDSCs) をターゲットにすることで,がんの再発を予防します. このアプローチは転移の形成と成長を阻害し,原発腫瘍の除去後の生存率を向上させます.
科学分野:
- 腫瘍学
- 免疫学
- エピジェネティクス
背景:
- 手術後の癌の再発は 重要な臨床的課題です
- ミエロイド由来抑制細胞 (MDSC) は,先発性微環境を作り,遠隔の腫瘍の拡散を助長する.
- 現在,転移前ニッチ形成を防ぐための介入は不足しています.
研究 の 目的:
- 低用量の副産物遺伝療法が癌の再発を予防する効果を調査する.
- 主要腫瘍切除後のメタスタシス前ニッチ形成におけるMDSCの役割を決定する.
- エピジェネティック療法がMDSCと転移に及ぼすメカニズムを探求する.
主な方法:
- 主要腫瘍切除後の肺転移のマウスモデルを使用した.
- 5- アザチチジンとエンチノスタットを使った低用量の補助的表皮遺伝療法.
- MDSCの流通,分化,および肺の前立方体ニッチでの蓄積を分析した.
- 化学療法と比較して,無病期および全生存期への影響を評価した.
主要な成果:
- 低用量エピジェネティックセラピーは,肺,乳がん,食道がんのモデルにおいて,前兆微環境を効果的に破壊した.
- 治療は選択的にMDSCを標的とし,CCR2とCXCR2のダウンレギュレーションによってそのトラフィックを抑制した.
- インタースティシャル・マクロファージのようなフェノタイプへのMDSCの分化が促進された.
- 転移前の肺にMDSCの蓄積が減少すると,生存率が向上した.
結論:
- MDSCは,原発性腫瘍の除去後でも,転移前のニッチの発達と残留腫瘍細胞の収縮に不可欠です.
- 低用量の補助的表皮質療法では,転移前微生物環境を破壊し,転移を抑制する新しい戦略が提供されます.
- このアプローチはがん患者の生存率を改善する 補助療法として有望です
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