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心臓アロインプラント拒絶時のCOX-2のアップレギュレーション
1Departments of Medicine, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA.
Circulation
|February 2, 2000
まとめ
シクロオキシゲナーゼ-2 (COX-2) と誘導性酸化窒素合成酵素 (iNOS) は,心臓アロ移植拒絶において上調される. COX-2とiNOSを阻害すると,アロ移植の生存率がわずかに増加したが,拒絶の強度やミオサイトアポトーシスを有意に減少させなかった.
科学分野:
- 免疫学 免疫学とは
- 心血管科学の研究について
- 薬理学 薬理学とは
背景:
- 心臓アロ移植拒絶時の心筋膜炎症におけるサイクロオキシゲナーゼ-2 (COX-2) の役割を調査する.
- ネズミの異型腹部心臓移植モデルを用いて.
研究 の 目的:
- 心臓アロインプラント拒絶の炎症反応におけるCOX-2の関与を決定する.
- COX-2および誘導性酸化窒素合成酵素 (iNOS) 阻害がアロ移植の生存および拒絶マーカーに与える影響を評価する.
主な方法:
- COX-2とiNOSのmRNAとタンパク質発現の定量化,心臓アロ移植の拒絶について.
- COX-2の局所化の免疫ヒスト化学分析.
- プロスタグランジン (PG) 濃度の測定.
- 選択的なCOX-2およびiNOS阻害剤を投与し,その効果を評価する.
- アロインプラントの生存率,肌細胞アポトーシス (TUNNELアッセイ),および拒絶の強度の評価.
主要な成果:
- COX-2とiNOSは,シンジェニック対照群と比較して,心臓アロ移植を拒絶する際に,著しく上位調節された.
- COX-2は,浸透したマクロファージと損傷した心筋細胞に局在していた.
- プロスタグランジンのレベルは,アロ移植の拒絶で上昇した.
- 阻害剤治療はCOX-2 mRNAとiNOSの活性を低下させ,アロインプラントの生存期間 (5.4〜6.4日) をわずかに増加させました.
- ミオサイトアポトーシスと拒絶の強度は,阻害剤治療によってわずかにしか影響されなかった.
結論:
- COX-2発現は,心臓アロインプラントの拒絶時に心筋内にあるiNOSと並行して強化されます.
- COX-2とiNOSの阻害は生存にわずかな利点を示していますが,拒絶プロセスや肌細胞損傷を完全に軽減しません.
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