C/EBPβは,運動によって引き起こされる心臓の成長を制御し,病理的な心臓の改造から保護します
Pontus Boström1, Nina Mann, Jun Wu
1Dana-Farber Cancer Institute, Harvard Medical School, 3 Blackfan Circle, CLS Building, Floor 11, Boston, MA 02115, USA.
Cell
|December 25, 2010
まとめ
減少したC/EBPβレベルは,運動効果を模倣して,心臓の成長と心筋細胞の増殖を促進します. この発見は,生理学的縮を理解し,心臓病の再生療法を開発するために極めて重要です.
科学分野:
- 心血管生物学 心血管生物学
- 分子心臓病学 分子心臓病学
- 再生医学は,再生医療である.
背景:
- 運動に反応して生理学的高縮を起こす心臓の能力は確立されていますが,その背後にある転写メカニズムはまだ不明です.
- 大人の心肌細胞の増殖は,心臓の再生医療にとって有望である.
- 心臓の成長と再生に影響を与える要因を理解することは,心臓病の治療に不可欠です.
研究 の 目的:
- 運動誘発性生理学的心筋縮に関与する転写レギュレータを解明する.
- 心筋細胞の増殖における特定の転写因子の役割を調査する.
- 心臓再生を促進し,心不全を予防するための新しい標的を特定する.
主な方法:
- 複写成分を分析するために,包括的なRT-PCRベースのスクリーンを利用しました.
- C/EBPβ減少の効果を in vitroおよびin vivoで調査した.
- 変化した遺伝子発現に対する反応として,評価された心筋細胞高縮および増殖.
- 遺伝子組み換えマウスにおける評価された心臓機能と圧力過負荷に対する耐性.
主要な成果:
- 運動は,C/EBPβのダウンレギュレーションと,心臓のCITED4発現のアップレギュレーションにつながった.
- C/EBPβのインビトロおよびインビボの減少は,運動誘発性心筋細胞高縮および増殖を模倣した.
- CITED4の発現の増加は,C/EBPβ駆動の拡散の主要な媒介物として特定されました.
- 心臓のC/EBPβが低下したマウスは,圧力過負荷による心不全に対する有意な抵抗を示した.
結論:
- C/EBPβは,成人哺乳類の心臓における心筋細胞の成長と増殖の抑制剤として作用する.
- C/EBPβの減少は,生理学的縮と心筋細胞増殖における中心的なシグナルイベントである.
- C/EBPβを標的とした治療は,心臓の修復を促進し,心不全を予防するための治療戦略を提供することができる.
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