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増加したエンドセリン-1レベルは,PKC依存の経路を通じて酸化窒素のホメオスタシスを損なう
Danny Ramzy1, Vivek Rao, Laura C Tumiati
1Heart Transplant Program, University of Toronto, Toronto, Ontario, Canada.
Circulation
|July 6, 2006
まとめ
増加したエンドセリン-1 (ET-1) は,タンパク質キナーゼC (PKC) シグナル伝達を通じて,エンドセリアル酸化窒素合成酵素 (eNOS) 発現を阻害することによって,酸化窒素 (NO) 産生を阻害する. ET-1アンタゴニズムは,血管ホメオスタシスを改善する可能性があります.
科学分野:
- 心血管生物学 心血管生物学
- 内皮機能の機能について
- 分子シグナリング
背景:
- エンドオセリン-1 (ET-1) は血管トーンに決定的な役割を果たし,イシェミア/再注射 (I/R) 損傷,血管,およびアロ移植血管病変に関与しています.
- I/R後のET-1濃度の上昇は,タンパク質キナーゼC (PKC) の異形転位によって酸化窒素 (NO) の生成を調節する可能性があります.
研究 の 目的:
- ヒトサフェノス静脈内皮細胞 (HSVEC) のNO産生に対する高濃度のET-1の影響を調査する.
- NO合成とeNOS発現に対するET-1の影響を媒介する特定のPKCイソフォームの役割を決定する.
主な方法:
- HSVECはET-1または媒介体で処理され,NOの産生は,窒素/窒素酸塩の濃度で測定されました.
- eNOS,iNOS,caveolin-1,PKCイソフォームのタンパク質発現が定量化されました.
- PKCの転位と活性は,ET-1曝露と薬理学的な調節を経て評価されました.
主要な成果:
- ET-1への曝露は,HSVECにおけるNO生成とeNOSタンパク質発現を著しく低下させた.
- PKCの阻害はNOの生成とeNOSの発現を減少させ,PKCの活性化 (PMA) はそれを増加させた.
- ET-1はPKCdeltaとPKCalphaの転位を誘発し,PKClambdaを阻害し,全体的なPKC活動を低下させた.
結論:
- 高レベルのET-1は,イソフォーム特異的なPKCメカニズムを通じてeNOS発現を抑制することによって,内皮 NOの産生を損なう.
- ボゼンタンが示したET-1抗作用は,PKClambdaの転位を促進し,PKCの活性を増強し,NOの産生を促進する.
- ET-1シグナリングをターゲットにすることは,血管の恒常性を回復するための潜在的な治療戦略を提供します.
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