妊娠前症候群患者のAT1受容体アゴニスティック抗体はNADPH酸化酵素を刺激する
Ralf Dechend1, Christiane Viedt, Dominik N Müller
1HELIOS Klinikum-Berlin, Franz Volhard Clinic and the Max Delbrück Center for Molecular Medicine, Humboldt University of Berlin, Germany.
Circulation
|April 2, 2003
まとめ
アンジオテンシンAT1受容体 (AT1-AA) に対するアゴニスティックな自己抗体は,生殖前不妊症において反応性酸素種 (ROS) を増加させ,核因子カッパB (NF-kappaB) を活性化させる. これは,AT1-AAがNADPH酸化酵素活性化による炎症に寄与することを示唆しています.
科学分野:
- 心血管科学の研究について
- 生殖生物学 生殖生物学
- 免疫学 免疫学とは
背景:
- アンジオテンシンAT1受容体 (AT1-AA) に対するアゴニスティックなオートアンチボディは,妊娠前出血症で特定されています.
- 妊娠前出血症の病原性におけるAT1-AAの正確な役割については,さらなる調査が必要である.
研究 の 目的:
- AT1-AAの反応性酸素種 (ROS) 生成,NADPH酸化酵素の発現,および子宮前出血症における核因子カッパB (NF-kappaB) の活性化に対する影響を明らかにする.
主な方法:
- 人間の血管の滑らかな筋肉細胞 (VSMC),トロフォブラスト,胎盤を研究した.
- 妊娠前の女性の血清から分離されたAT1-AA.
- ウェスタン・ブロッティング,NF-kappaB活性化アッセイ,遺伝子ノックアウトモデル (p47phox-/-マウス) を利用した.
主要な成果:
- AT1-AAとアニオテンシンII (Ang II) は,ROSの産生とNADPH酸化酵素成分 (p22,p47,p67フォックス) を増加させた.
- AT1-AAはNF-kappaBを活性化し,VSMCとトロフォブラストにおける阻害剤-kappaBalpha (I-kappaBalpha) 発現を減少させた.
- NF-kappaBの活性化とともに,p22,p47,p67フォックス発現の増加は,出産前患者からの胎盤に観察されました.
結論:
- NADPH酸化酵素は,妊産前不妊症においてNF-kappaBを上調するROSの重要な源である.
- AT1-AAは,NADPH酸化酵素の活性化により,ROSの産生と子宮内炎症前症における炎症反応に寄与する可能性があります.
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