孔を形成する構造による内皮細胞の活性化:インタールユーキン-1ααの重要な役割
S Saadi1, R A Holzknecht, C P Patte
1Department of Surgery, Mayo Clinic, Rochester, MN 55905, USA. saadi.soheyla@mayo.edu
Circulation
|April 19, 2000
まとめ
コンプリメントの膜攻撃複合体 (MAC) は,IL-1α経由で内皮細胞 (EC) を活性化し,炎症を誘発する. このメカニズムは,他の毛穴形成分子と共有されており,細胞活性化のための共通の経路を強調しています.
科学分野:
- 免疫学 免疫学とは
- 細胞生物学 細胞生物学
- 血管生物学 血管生物学
背景:
- 内皮細胞 (ECs) との補足相互作用は,炎症と凝固を誘発する.
- ECの膜攻撃複合体 (MAC) は,IL-1alpha.を介して組織因子とサイクロオキシゲナーゼ-2を上調する.
- この研究では,MACがこのメカニズムを通じてECをグローバルに活性化させ,他の孔を形成する構造がそれを利用するかどうかを調査しています.
研究 の 目的:
- MACが全体的にブタの大動脈および微血管ECを活性化しているかどうかを判断する.
- MAC誘発EC活性化のメカニズムが他の孔を形成する構造と共有されているかどうかを確認する.
- 補足媒介によるEC活性化におけるIL-1αの役割を明らかにする.
主な方法:
- ECはコンプリメントにさらされ,遺伝子発現 (E-セレクチン,ICAM-1,VCAM-1,Ikappa-Balpha,IL-1alpha,IL-1beta,IL-8,PAI-1) は6時間以上分析されました.
- IL-1受容体アンタゴニストは,遺伝子発現が主応答であるかどうかを評価するために使用されました.
- Anti-IL-1alpha抗体は,IL-1alphaのオトクリン作用を調査するために使用されました.
- 毛穴形成ペプチド (メリチン,マストパラン) は,E-セレクチン誘導に対するその効果を研究するために使用されました.
主要な成果:
- コンプリメントが誘発したECにおける複数の炎症性および凝固に関連する遺伝子のアップレギュレーション.
- IL-1受容体の対抗剤が部分的にそれを阻害したため,遺伝子発現は主要な応答ではありませんでした.
- 補給介のEC活性化は,自己決定性IL-1alphaに依存し,反IL-1alpha抗体によって抑制された.
- 毛穴形成ペプチドであるメリチンとマストパランは,IL-1経由で誘導されたEセレクチンである.
結論:
- 膜外孔形成タンパク質は,オトクリンIL-1αシグナル伝達を通じてECを活性化します.
- この経路は,様々な孔を形成する分子によるEC活性化の一般的なメカニズムです.
- 発見は,血管炎症における補完体および他の毛穴形成ペプチドのための統一されたメカニズムを示唆しています.
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