循環器の老化の増加と,昼夜遺伝子のPer2の変異によって媒介される内皮原始細胞機能の障害
Chao-Yung Wang1, Ming-Shien Wen, Hong-Wei Wang
1Brigham and Women's Hospital, 65 Landsdowne St, Room 275, Cambridge, MA 02139, USA.
Circulation
|November 5, 2008
まとめ
シルカディアン遺伝子のPer2変異は,細胞老化を促進し,内皮原始細胞の機能を低下させることで,血管修復を損なう. Per2機能の回復は,イシュケミアの後の再血管化を改善します.
科学分野:
- 心血管生物学 心血管生物学
- シルカディアンリズムとは
- 血管生物学 血管生物学
背景:
- 循環器リズム障害と血管老化は,心血管疾患と関連しています.
- シルカディアン遺伝子Per2は,内皮に依存する血管運動を調節しますが,内皮機能におけるそのメカニズムは不明です.
- Per2変異は,血管老化と末原細胞 (EPC) 機能の障害を経由して,内皮機能障害を引き起こす可能性があります.
研究 の 目的:
- 内皮機能と血管修復における昼夜遺伝子のPer2の役割を調査する.
- Per2欠乏が血管衰老とEPC機能障害につながるかどうかを判断する.
- Per2変異が再血管化に影響を与えるメカニズムを解明する.
主な方法:
- Per2変異 (Per2(m/m)) と野生型のマウスの内皮細胞と血管機能の比較.
- 血管老化,Aktシグナル伝達,および内皮細胞におけるネットワーク形成を評価した.
- EPCの動員と機能を研究するために,後肢不全症モデルと骨髄移植を用いた.
- マトリゲルインプラントと血流回復による評価された新血管化.
主要な成果:
- Per2(m/m) 内皮細胞は,Aktシグナル伝達,老化,増殖とネットワーク形成の減少を示した.
- m/m) のマウスは,血流回復の障害,新血管化,およびイシュケミアの後の四肢の自動切断を示した.
- イシュケミアまたはVEGF.への反応として,Per2(m/m) のマウスでは,EPCの動員が低下していた.
- 野生型のEPC移植は,Per2 (m/m) のマウスの血流を回復し,オートアムプテーションを防止しました.
結論:
- Per2変異は,Aktに依存した血管老化を誘発する.
- Per2変異によるEPC機能障害は,イシュケミアによる再血管化を阻害する.
- Per2のターゲティングは,血管修復と心血管疾患の治療戦略を提供することができます.
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