エピジェネティック・リーダー BRD4 (ブロモドメインを含むタンパク質4) 核エンコードされたミトコンドリアトランスクリプトームを制御し,心臓機能を調節する
Soo Young Kim1, Xin Zhang2, Gabriele G Schiattarella1
1Division of Cardiology, Department of Internal Medicine (S.Y.K., G.G.S., F.A., K.M.F., N.J., P.A.S., H.I.M., X.L., L.I.S., S.L., T.G.G., J.A.H.), University of Texas Southwestern, Dallas.
Circulation
|October 28, 2020
まとめ
ブロモドメインとBETタンパク質 BRD4は正常な心臓機能を維持するために不可欠です. 心筋細胞におけるBRD4の喪失は,拡張心筋病を引き起こし,ミトコンドリアのエネルギー生成を妨害し,心臓の健康におけるその重要な役割を強調する.
科学分野:
- 心血管生物学
- エピジェネティクス
- ミトコンドリア生理学
背景:
- BRD4を含むBETタンパク質は,がんや心血管疾患の治療標的である.
- JQ1のような薬理学的阻害剤は 臨床前における心不全のモデルにおいて有望であることが示されています
- 心臓におけるBRD4の役割の遺伝的検証は欠けている.
研究 の 目的:
- 遺伝的アプローチを用いて心臓病理学におけるBRD4の機能を調査する.
- 心臓の発達と成熟機能における BRD4 の役割を明らかにする.
- 薬理学的なBET阻害剤試験の結果を検証する.
主な方法:
- 心筋細胞特有のBRD4ノックアウトマウスモデルを生成した.
- 機能的,トランスクリプトミカル,ミトコンドリアの分析を行いました.
- 制御する転写因子を特定するために計算分析を用いた.
主要な成果:
- BRD4の喪失は心臓機能の進行的な低下を引き起こし,拡張心筋病を引き起こしました.
- トランスクリプトミックの解析は ミトコンドリアのエネルギー生成遺伝子の破壊を明らかにした.
- ミトコンドリアの研究では 電子輸送鎖の活性が変化したことを確認した.
- エストロゲン関連受容体αは,BRD4依存遺伝子の重要な調節体として特定されました.
結論:
- BRD4は心臓肌細胞のミトコンドリア・ホメオスタシスにおいて,これまで認識されていない重要な役割を果たしている.
- BRD4は正常な心臓機能を維持するために不可欠です.
- BRD4の遺伝的消去は,薬学的抑制と比較して,はっきりと深刻な結果をもたらします.
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