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アドレノメドゥリンは,内生性ペプチドであり,心血管損傷を食い止める
Tatsuo Shimosawa1, Yugo Shibagaki, Kotaro Ishibashi
1Department of Nephrology and Endocrinology, Faculty of Medicine, the University of Tokyo, Bunkyo-ku, Tokyo, Japan.
Circulation
|January 5, 2002
まとめ
内生性アドレノメドウリン (AM) は,酸化ストレスを抑制することにより,心血管損傷から保護します. AM(+/-) マウスを用いた研究では,アンジオテンシンIIと高塩分ダイエットで治療したときに,心血管損傷と酸化ストレスマーカーの増加が明らかになりました.
科学分野:
- 心血管科学 心血管科学
- エンドクリノロジー エンドクリノロジー
- 分子生物学は分子生物学である.
背景:
- アドレノメドルリン (AM) は,血管拡張性および臓器保護性を持つペプチドホルモンです.
- プロアドレノメドウリン N-ターミナル20ペプチド (PAMP) は,AMと共同生産されています.
- AMとPAMPの個々の生理学的役割は,体内では不明のままである.
研究 の 目的:
- 内生性アドレノメドゥリンの (AM) 臓器保護効果を in vivo で調査する.
- アンジオテンシンII (Ang II) と高塩分食による心血管損傷におけるAMの役割を明らかにする.
主な方法:
- 破壊されたAMペプチド発現 (AM(+/-) を有するノックアウトマウスを利用した.
- アンジオテンシンII (Ang II) を12日間,塩分が多い食事と併用して投与した.
- 評価された心血管の変化,酸化ストレスマーカー (8-ヒドロキシデオキシグアノシン,イソプロスタン),および活性酸素種 (ROS) 発生.
主要な成果:
- AM (((+/-) マウスは,Ang II/塩の治療後,冠動脈の顕著な周周筋線維症と内臓性多発症を示した.
- AM(+/-) マウスは,酸化ストレスマーカーの尿排泄が増加したことを示した.
- 治療を受けたAM(+/-) のマウスの心臓では,ROS生成とNAD(P) H酸化酵素サブユニット (p67phox,gp91phox) の増加が観察されました.
結論:
- 固有のAMは,心血管損傷に対する保護的役割を果たします.
- AMの保護メカニズムには,酸化ストレス生成の抑制が含まれている可能性があります.
- 酸化ストレスの過剰生産は,Ang II/塩の負荷によって引き起こされる心血管の変化に寄与する.
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