メラノーマにおけるBRAF (V600E) 抑制に対する可逆的および適応的耐性
Chong Sun1, Liqin Wang1, Sidong Huang2
11] Division of Molecular Carcinogenesis, Cancer Systems Biology Centre and Cancer Genomics Centre Netherlands, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands [2].
Nature
|March 28, 2014
まとめ
BRAF/MEK阻害剤に対するメラノーマ耐性は,SOX10の損失から生じ,EGFRを増加させる可能性があります. これは薬剤耐性を説明し,EGFR陽性患者が薬物休暇と再治療から利益を得ることを示唆しています.
科学分野:
- 腫瘍学 腫瘍学
- 分子生物学は分子生物学である.
- 癌の遺伝学 癌の遺伝学
背景:
- BRAF (V600E) 変異性メラノーマはBRAF/MEK阻害剤で治療できますが,耐性が一般的です.
- BRAF ((V600E) を含む結腸がんは,EGFRフィードバックにより,BRAF阻害剤に耐性がある.
- メラノーマの獲得抵抗性メカニズムを理解することは,効果的な治療のために非常に重要です.
研究 の 目的:
- メラノーマにおけるBRAFおよびMEK阻害剤に対する既得耐性のメカニズムを調査する.
- 薬剤耐性の発達に関与する重要な規制者を特定する.
- BRAF変異性メラノーマの獲得抵抗を克服するための治療戦略を探求する.
主な方法:
- レジスタンスを開発した後のEGFR発現のためのメラノーマ腫瘍の分析.
- 耐性遺伝子をスクリーニングするために,染色体調節器に焦点を当てたshRNAライブラリを使用しました.
- SOX10抑制とTGF-βシグナル伝達が抵抗性を引き起こす役割を調査した.
主要な成果:
- 獲得EGFR発現は,抵抗性メラノーマ腫瘍16種のうち6種で観察されました.
- SOX10抑制はTGF-βの活性化につながり,EGFRとPDGFRβを上調させ,耐性を引き起こしました.
- EGFR発現またはTGF-β暴露は老化を誘発したが,薬物治療では増殖を促進した.
- SOX10の損失および/またはTGF-βの活性化は,EGFR陽性薬剤耐性患者のサンプルで発見されました.
結論:
- SOX10の喪失と,その後のEGFRのアップレギュレーションは,メラノーマにおけるBRAF/MEK阻害剤に対する耐性を高めます.
- このメカニズムは,なぜ一部のレジスタントメラノーマ患者が薬物休暇後に敏感性を回復するかを説明します.
- EGFR陽性メラノーマの患者は,薬物休暇の後に再治療戦略から利益を得ることができます.
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