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In Vitro Assessment of Cardiac Function Using Skinned Cardiomyocytes
Published on: June 22, 2020
ティチンの弾性タンデム免疫グロブリンセグメントの縮小は,ダイアストリック機能不全を引き起こす
Charles S Chung1, Kirk R Hutchinson, Mei Methawasin
1Department of Physiology, University of Arizona, PO Box245051, Tucson AZ 85724, USA.
Circulation
|May 28, 2013
まとめ
タイチンのタンデム免疫グロブリン (Ig) セグメントを短縮すると,ダイアストリック機能不全が生じます. IGKOマウスにおけるこのチチンベースの受動的な硬さの増加は,下痢性機能不全と運動耐性の低下につながります.
科学分野:
- 心血管生理学 心血管の生理学
- 分子生物学は分子生物学である.
- バイオフィジックス 生物物理学
背景:
- ダイアストリック機能障害は,ダイアストリック硬さの増加によって特徴づけられる一般的な症候群です.
- ティチンは,細胞の受動的な硬さを決定する重要なタンパク質です.
- ティチンのタンデム免疫グロブリン (Ig) セグメントが硬直性や腹動力機能不全に与える役割は不明である.
研究 の 目的:
- 硬化生成におけるチチンのタンドムIgセグメントの生理学的役割を調査する.
- このセグメントの縮小が腹動力機能不全を引き起こすかどうかを判断する.
- 立方体機能不全に対するチチンベースのメカニズムを確立する.
主な方法:
- マウスモデル (IG KO) を生成し,titinのタンドム Ig セグメントから9つのIgのようなドメインを削除しました.
- エクソンマイクロアレイによるチチンのスプライシングと,フォスフォ特異抗体を用いたリン酸化を分析した.
- 免疫電子顕微鏡を用いて,受動性筋細胞の硬さを測定し,チチンの構造を調べました.
- 組織および臓器レベルのダイアストリック硬さ,細胞外マトリックス組成,運動耐性を評価した.
主要な成果:
- IGKOマウスは,受動的な肌細胞の硬さが増加した.
- 免疫電子顕微鏡では,残りのチチンのスプリングセグメントの拡張が示されました.
- 浸透性硬さは組織と臓器レベルで増加し,細胞外マトリックスではなくチチンによって引き起こされる.
- IGKOマウスは運動耐性が低下しており,これはダイアストリック機能不全に関連した現象型である.
結論:
- ティチンベースの受動的な硬さの増加は,ダイアストリック機能不全を引き起こすのに十分です.
- チチンのタンデムIgセグメントは,下痢性硬化に重要な役割を果たしています.
- ティチンベースのメカニズムは,下痢性機能不全と関連する運動不耐症の根底にある.
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