SIRT7は,H3K18の脱エチル化と,腫瘍性変異の維持を結びつけている
Matthew F Barber1, Eriko Michishita-Kioi, Yuanxin Xi
1Department of Biology, Stanford University, Stanford, California 94305, USA.
Nature
|June 23, 2012
まとめ
ヒストン脱酸化酵素であるSIRT7は,H3K18Ac.Ac.を脱酸化することによって癌細胞を安定させます. SIRT7を枯渇させると,腫瘍の成長が低下し,がんの進行におけるSIRT7の役割と,治療標的としての潜在力を強調する.
科学分野:
- 分子生物学は分子生物学である.
- エピジェネティクス エピジェネティクス
- がん研究 がん研究
背景:
- Sirtuinsは,細胞経路,代謝,そして老化を調節するタンパク質です.
- 哺乳類シルトゥイン7 (SIRT7) の特定の機能と標的は,以前は不明でした.
- ヒストンアセチル化,特にH3K18Acは,細胞変異とがんの予後に関連しています.
研究 の 目的:
- SIRT7.7の生化学的活動と生理学的機能を明らかにする.
- 癌細胞の変異状態の安定化におけるSIRT7の役割を決定する.
- 染色体調節と腫瘍形成に対するSIRT7の影響を調査する.
主な方法:
- バイオケミカルアッセイは,NAD ((+)) に依存したH3K18Ac脱酸化酵素としてSIRT7の酵素活性を特定する.
- SIRT7標的遺伝子プロモーターをマッピングするための全ゲノム結合研究.
- 人間の癌細胞とマウスの異種移植においてSIRT7の減少を伴う実験.
主要な成果:
- SIRT7は,特定の遺伝子プロモーターのH3K18Acを脱酸化し,転写抑制につながります.
- SIRT7とELK4の相互作用は,腫瘍抑制遺伝子を含む標的遺伝子スペクトルに影響を与える.
- SIRT7は,アンカージ・インデペンデント・成長やコンタクト・インヒビレーションの回避などの癌細胞特性に欠かせないものであり,枯渇時に腫瘍異種移植の成長を減少させます.
結論:
- SIRT7は,がん細胞の変容を維持するために極めて重要な,高度に選択的なH3K18Ac脱酸化酵素である.
- SIRT7は,染色体調節と細胞変換プログラムにおいて重要な役割を果たします.
- SIRT7は,腫瘍形成に不可欠であり,その潜在的可能性が治療的標的であることを示唆しています.
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