呼吸道微血管の維持に必要とされる内皮低酸素誘導因子-2α
Xinguo Jiang1,2, Wen Tian1,2, Allen B Tu1,2
1Veterans Affairs Palo Alto Health Care System, CA (X.J., W.T., A.B.T., S.P., E.S., P.D., P.Z., T.T.D., B.L., C.C., E.C.B., M.R.N.).
Circulation
|December 28, 2018
まとめ
低酸素誘導因子2α (HIF-2α) は,健康な呼吸道微血管の維持に不可欠です. 過剰発現は血管の整体性を促進する一方,その欠乏は内皮細胞死と肺機能障害につながる.
科学分野:
- 肺と血管の生物学
- 肺ホメオスタシスの細胞および分子機構
背景:
- 低酸素誘導因子 (HIF) は低酸素に対する適応反応を調節し,肺疾患に関与しています.
- 特に呼吸道におけるマイクロ血管の健康維持における内皮細胞のHIF生成の役割は完全に理解されていません.
研究 の 目的:
- HIF-1αとHIF-2αが気管微血管系における特定の役割を調査する.
- 腸内HIF発現が呼吸道微血管の完全性と機能に不可欠かどうかを判断する.
主な方法:
- HIF-1αとHIF-2αの条件付きデレーションまたは過剰発現は,マウスの気管微血管系にみられる.
- 血管の解剖学, perfusion, バリア機能, angiogenic 信号の評価
- 骨髄移植モデルを用いた評価
主要な成果:
- HIF- 2α欠乏症は,HIF- 1αとは異なり,内皮細胞のアポトーシス,輸液の減少,気管の微小血管の障壁機能の障害を引き起こした.
- HIF- 2αは,アンジオポエチン- 1/ TIE2とノッチシグナル伝達によって微血管の整合性を維持する.
- HIF- 2αの過剰発現は微小血管 perfusionを改善し,炎症を軽減しました.
結論:
- 腸内HIF-2αの構成表現は,呼吸道微血管の健康を維持するために不可欠です.
- HIF-2αは,呼吸道血管の整体性と機能を調節する上で重要な役割を果たします.
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