癌細胞亜集団におけるクロマチン媒介の可逆薬剤耐性状態である
Sreenath V Sharma1, Diana Y Lee, Bihua Li
1Massachusetts General Hospital Cancer Center, 149 13th Street, Charlestown, MA 02129, USA.
Cell
|April 8, 2010
まとめ
癌細胞は,IGF-1受容体シグナル伝達とRBP2によって媒介される一時的な薬物耐性状態を発展させ,化学療法から生き残る. この可逆性フェノタイプをターゲットにすることは,潜在的な治療戦略を提供します.
科学分野:
- 腫瘍学 腫瘍学
- 細胞生物学 細胞生物学
- がん研究 がん研究
背景:
- 癌細胞の異質性は,治療反応に影響する.
- 人間の腫瘍細胞系には,薬剤耐性細胞の小さな亜集団が存在する.
- 薬剤耐性を理解することは,効果的ながん治療に不可欠です.
研究 の 目的:
- 癌細胞における可逆薬剤耐性のメカニズムを調査する.
- 薬剤耐性がん細胞亜集団を排除するための治療標的を特定する.
- 癌の生存におけるフェノタイプの異質性の役割を調査する.
主な方法:
- ヒト腫瘍細胞系における抗がん剤に対する急性反応のモデリング.
- 薬物耐性におけるIGF-1受容体シグナル伝達の役割を分析する.
- 薬剤耐性フェノタイプにおけるヒストンデメチラーゼRBP2/KDM5Aの関与を調査する.
- IGF-1受容体阻害剤と染色体変異剤の効果を評価する.
主要な成果:
- リバーシブルな薬剤耐性細胞の小さな亜集団が一貫して検出されました.
- これらの細胞は100倍以上の薬剤感受性の低下を示します.
- 薬剤耐性は,IGF-1受容体のシグナル伝達とRBP2依存の変異クロマチンの状態によって維持されます.
- 薬剤耐性フェノタイプは,動的に調節され,一時的に獲得されます.
結論:
- 癌細胞集団は,一時的な薬剤耐性を伴うダイナミックな生存戦略を使用します.
- 個々の細胞は,集団を保護するために,薬剤耐性状態を逆転的に採用することができます.
- IGF-1受容体のシグナル伝達やクロマチンの改変をターゲットにすることで,薬剤耐性細胞を選択的に排除することができます.
- これは,治療抵抗性を克服するための潜在的な治療的機会を提示します.
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