誘導性酸化窒素合成酵素遺伝子療法によって提供される心臓保護は,核因子-kappaB依存経路経由でサイクロオキシゲナーゼ-2によって媒介されます
Qianhong Li1, Yiru Guo, Wei Tan
1Institute of Molecular Cardiology, University of Louisville, Louisville, KY, USA.
Circulation
|September 6, 2007
まとめ
誘導性酸化窒素合成酵素 (iNOS) 遺伝子治療は,核因子-カッパB (NF-kappaB) 経路を通じたサイクロオキシゲナーゼ-2 (COX-2) を上調することで心臓を保護します. この遺伝的メカニズムは,iNOS媒介の心臓保護に極めて重要です.
科学分野:
- 心血管科学の研究について
- 分子生物学は分子生物学である.
- 遺伝子療法の遺伝子治療法
背景:
- 誘導性酸化窒素合成酵素 (iNOS) 遺伝子治療は心臓発作の大きさを減少させ,サイクロオキシゲネーゼ-2 (COX-2) と関連しているが,そのメカニズムは不明である.
- 薬理学的なCOX-2阻害剤には特異性がないため,遺伝学的調査が必要である.
研究 の 目的:
- iNOS遺伝子療法の心臓保護が,核因子カッパB (NF-kappaB) に依存する経路を通じてCOX-2のアップレギュレーションに依存しているかどうかをテストする.
主な方法:
- COX-2ノックアウトとNF-kappaB経路阻害モデルを含む遺伝子組み換えマウスを使用しました.
- 投与されたiNOS遺伝子治療は,心内注射によるものです.
- 誘発された心筋梗塞と,心筋梗塞のサイズとタンパク質発現の評価.
主要な成果:
- iNOS遺伝子療法は,野生型のマウスの心臓発作の大きさを減少させたが,COX-2ノックアウトマウスの場合は減少しなかった.
- iNOS遺伝子治療は,NF-kappaBシグナル伝達が阻害されたマウスでは,COX-2をアップレギュレーションしたり,心臓保護を提供したりできませんでした.
- COX-2は,iNOSのアップレギュレーションなしでは,基礎条件下では保護的ではなかった.
結論:
- COX-2は,iNOSに依存した心臓の保護に不可欠です.
- NF-kappaBは,iNOSとCOX-2のアップレギュレーションを結びつける重要なメディエーターとして作用します.
- iNOS遺伝子治療は,NF-kappaBを活性化し,その後COX-2を上調することで,少なくとも部分的に心臓を保護します.
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