新しい心臓特異性のヒトトロポミオシンイソフォームの分子および機能的特徴
Sudarsan Rajan1, Ganapathy Jagatheesan, Chehade N Karam
1Department of Molecular Genetics, Biochemistry, and Microbiology, University of Cincinnati Medical Center, Cincinnati, OH 45267-0524, USA.
Circulation
|January 13, 2010
まとめ
新しいトロポミオシン (TPM) アイソフォームであるTPM1kappaは,ヒトの心不全で増加し,マウスでは拡張性心筋症を引き起こす. この発見は,心疾患におけるTMイソフォームスイッチの結果のメカニズムを提供する.
科学分野:
- 筋肉の生理学について
- 心血管研究に関する研究.
- タンパク質の生化学
背景:
- トロポミオシン (TM) は,カルシウムに依存する筋肉の収縮を調節する.
- TPM1alphaは人間の心臓における主要なTM同型であるが,他の同型はよく特徴づけられていない.
研究 の 目的:
- 人間の心臓における線状筋TMイソフォームを定量化する.
- 心臓機能と疾患における新しいTMイソフォーム,TPM1kappaの役割を調査する.
主な方法:
- TPM1kappa特有の抗体を開発しました.
- 拡張性心筋病や心不全の患者を含む人間の心臓における量化されたTMイソフォームレベル.
- 心臓特異のTPM1kappa.を過剰発現するトランスジェニックマウスを生成した.
- ネズミの心臓に生理学的,生体物理学的研究を行った.
主要な成果:
- TPM1kappaは人間の心臓に発現し,そのレベルは膨張性心筋病や心不全で増加します.
- マウスにおけるTPM1kappaの過剰発現は,心機能障害による拡張性心筋症候群を誘発した.
- TPM1kappaは,TPM1alpha.と比較して,より弱いアクチン結合親和性と構造的安定性の低下を示しています.
結論:
- TPM1kappaは膨張性心筋病に寄与する.
- TPM1kappaの機能的特性は,心不全におけるTMイソフォームスイッチの結果のためのメカニズムを提供します.
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