代謝酵素 PFKFB4 は,転写共同活性化剤 SRC-3 を活性化し,乳がんを誘発する
Subhamoy Dasgupta1,2, Kimal Rajapakshe3, Bokai Zhu3
1Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA. subhamoy.dasgupta@roswellpark.org.
Nature
|April 5, 2018
まとめ
代謝酵素PFKFB4は,腫瘍性SRC-3を活性化させ,糖質代謝と転写変化を結びつけ,攻撃的な乳がんの成長と転移を促します. この発見は 転移した腫瘍の 新しい治療目標を示しています
科学分野:
- 生物化学
- 分子生物学
- 癌 研究
背景:
- 癌細胞は 代謝と転移を支える 転写プログラムが変化しています
- がんにおける代謝再プログラムと転写調節の相互作用は,まだ完全に理解されていません.
研究 の 目的:
- 癌における代謝再プログラムと転写制御を結びつけるメカニズムを解明する.
- 腫瘍性トランスクリプションプログラムの重要なレギュレータを特定する.
- 癌の進行における6-フォスフォフルト-2-キナーゼ/フルクトーゼ-2,6-ビスフォスファターゼ4 (PFKFB4) の役割を調査する.
主な方法:
- SRC-3活動を調節するキナーゼを特定するためのキノーム全体のRNA干渉スクリーニング.
- SRC-3のリン酸化部位分析
- グルコースの流れとピュリン合成経路の評価
- コイムノプレシピテーションとクロマチンの免疫プレシピテーション測定法
- 乳がんの転移のマウスモデルを用いた in vivo 研究
- 患者の腫瘍サンプルにおけるPFKFB4とSRC-3の相関分析
主要な成果:
- PFKFB4は,腫瘍性ステロイド受容体共同活性化剤-3 (SRC-3) の主要な活性化剤として特定されました.
- PFKFB4は,セルリン857でSRC-3をリン酸化し,その転写活性を高め,ペントースリン酸経路とピュリン合成へのグルコースフルースを促進する.
- SRC-3はPFKFB4によって調節され,トランスケトラーゼの発現を向上させ,ATF4と相互作用する.
- PFKFB4またはSRC-3の除去,または非リン酸化SRC-3変異体の使用は,マウスの乳がんの成長と転移を抑制しました.
- エストロゲン受容体陽性および基礎型乳がん患者の生存率は低い.
結論:
- PFKFB4は,細胞の糖分代謝とSRC-3経由の転写活性化との間の重要なリンクとして作用する.
- PFKFB4によるSRC-3の活性化は,攻撃的な腫瘍の成長と転移を促進する.
- PFKFB4- SRC-3軸をターゲットにすることは,転移性乳がんの潜在的な治療戦略です.
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