急性冠動脈症候群に関連した動脈硬化性プラークにおけるエンドプラズマ網膜のストレス増加
Masafumi Myoishi1, Hiroyuki Hao, Tetsuo Minamino
1Department of Cardiovascular Medicine, National Cardiovascular Center, Suita, Osaka 565-8565, Japan.
Circulation
|August 22, 2007
まとめ
エンドプラズマ網膜 (ER) のストレスとアポトーシスは,不安定な冠動脈プラークで増加します. これは,ERストレス誘発の細胞死が心臓発作の重要な要因であるプラークの脆弱性に寄与することを示唆しています.
科学分野:
- 心血管生物学 心血管生物学
- 細胞のストレス反応は,
- 動脈硬化症の研究研究
背景:
- エンドプラズマ網膜 (ER) のストレスは,チャペロン産生を誘発するが,長期のストレスは,アポトーシスを引き起こす.
- アポトーシスは,動脈硬化性プラークの進行と破裂において極めて重要です.
- 不安定な冠動脈プラーク破裂におけるERストレスとアポトーシスの役割は完全に理解されていません.
研究 の 目的:
- ERストレス,アポトーシス,冠動脈動脈硬化プラークの脆弱性との関連を調査する.
主な方法:
- 患者から採取した冠動脈とアテレクトミーサンプルを分析.
- ERチャペロン発現,アポプトシス細胞,および7-ケトコレステロールレベルの評価.
- 7-ケトコレステロールと抗酸化物質で治療された培養細胞を用いたインビトロ研究.
- CHOP依存のシグナル伝達経路とsiRNA媒介のノックダウンに関する調査.
主要な成果:
- ERチャペロン発現の増加とアポプトシス細胞は,薄いキャップアテロマの繊維状キャップと破裂したプラークで観察されました.
- ERチャペロン発現率が高いのは,不安定なアンギナ患者の標本で見つかりました.
- 7-ケトコレステロールが誘発したERチャペロンと培養細胞におけるアポトーシス,抗酸化物質によって阻害された効果.
- CHOPに依存する経路が不安定なプラークで活性化され,CHOPのノックダウンにより,ERのストレス誘発細胞死が減少しました.
結論:
- 不安定な冠動脈プラークは,エンドプラズマ網膜のストレスが増加することを示す.
- 滑らかな筋肉細胞とマクロファージのERストレス誘発のアポトーシスは,プラークの脆弱性に寄与する可能性が高い.
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