ヒスタミンは組織因子の発現を誘導する: 急性冠動脈症候群への影響
Jan Steffel1, Alexander Akhmedov, Helen Greutert
1Cardiovascular Research, Physiology Institute, University of Zurich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
Circulation
|July 13, 2005
まとめ
ヒスタミンは,H1受容体とMAPキナーゼを通して血管細胞における組織因子 (TF) 発現を誘発し,潜在的に変異性アンギナと急性冠動脈症候群に影響を与える.
科学分野:
- 心血管生物学 心血管生物学
- 分子医学は分子医学である.
- 細胞シグナル伝達 細胞信号伝達
背景:
- ヒスタミンは冠動脈血管 espasm を引き起こし,変異性アンギナと心筋梗塞に寄与することが知られている.
- 血栓形成におけるヒスタミンの特定の役割は不明である.
- この研究では,血管細胞における組織因子 (TF) 発現を誘導するヒスタミンの可能性を調査しています.
研究 の 目的:
- ヒスタミンがヒト大動脈内皮および血管の滑らかな筋肉細胞における組織因子 (TF) 発現を誘導するかどうかを決定する.
- ヒスタミン誘発のTF発現に関与する受容体経路と細胞内シグナリングカスケードの解明.
- 変異性アンギナや急性冠動脈症候群などの状態への影響を調査する.
主な方法:
- 人間の大動脈内皮および血管の滑らかな筋肉細胞はヒスタミンで治療されました.
- 組織因子 (TF) とTF経路阻害剤の発現はRT-PCRとノースンブロッティングを用いて評価された.
- MAPキナーゼ (p38,ERK,JNK) とフォスファディチルイノシトール3キナーゼ (PI3K) のシグナル伝達経路が調査されました.
- レセプターアンタゴニズム (H1とH2) と特定のキナーゼ抑制が採用されました.
主要な成果:
- ヒスタミンは,H1受容体経由で濃度依存のTF発現を誘導するが,H2受容体経由では誘導しない.
- ヒスタミンはTF mRNAとタンパク質発現を刺激し,表面活性を増大させた.
- この効果は,p38,ERK,およびJNK MAPキナーゼの活性化によって媒介された.
- PI3Kの阻害はヒスタミン誘発のTF発現を高め,Rho-キナーゼの阻害は効果がなかった.
結論:
- ヒスタミンは,H1受容体の活性化を通じて,血管細胞におけるTF発現を誘導する.
- 信号伝達経路には,p38,ERK,およびJNK MAPキナーゼが含まれています.
- これらの発見は,ヒスタミンを血栓形成に結びつける新しいメカニズムを示唆し,心血管疾患の潜在的な治療標的を提供します.
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