腫瘍ネクロシス因子-α受容体p75は,イシュケミア誘発の新血管化において必要である
David A Goukassian1, Gangjian Qin, Christine Dolan
1Division of Cardiovascular Diseases, Department of Medicine, Caritas St Elizabeth's Medical Center, Boston, Mass, USA. dgoukass@bu.edu
Circulation
|January 31, 2007
まとめ
p75 TNF受容体は,特に高齢者のイシュケミアの後の血管修復に不可欠です. この受容体をターゲットにすると,血管疾患からの回復が改善される可能性があります.
科学分野:
- 心血管生物学 心血管生物学
- 免疫学 免疫学とは
- 再生医学は,再生医療である.
背景:
- 老化により,外周動脈疾患のリスクが増加します.
- 腫瘍死滅因子アルファ (TNF-alpha) は,不血性組織における血管新生に影響を与えます.
- 血管新生におけるTNFα受容体 (TNFR1/p55,TNFR2/p75) の役割は十分に理解されていません.
研究 の 目的:
- TNFR2/p75が新血管化と後肢イシュケミアの回復における役割を調査する.
- TNFR2/p75機能が血管修復において年齢に依存しているかどうかを判断する.
- 発作後の回復を改善するための潜在的な治療目標を特定する.
主な方法:
- 若いと老いたTNFR2/p75ノックアウト (p75KO) と野生型のマウスの後肢性缺血モデルを使用した.
- 評価された肢体生存,血流,毛細血管密度,および血管新生因子の発現 (VEGF,FGF-2).
- p75KOマウスにおける四肢回復に対する骨髄移植の影響を評価した.
主要な成果:
- 古いp75KOマウスは,野生型の対照群とは異なり,100%の肢体自動切断を示した.
- p75KOマウスは,血流の障害,内皮細胞アポトーシスの増加,毛細血管の密度の低下を示した.
- VEGFとFGF-2の発現と循環する内皮原始細胞は,p75KOマウスで有意に減少しました.
- 骨髄移植は,古いp75KOマウスの四肢喪失を予防しました.
結論:
- 骨髄由来細胞におけるp75 TNF受容体のシグナル伝達に部分的に依存している.
- TNFR2/p75のシグナル伝達は,内皮細胞の生存,成長因子発現,原始細胞の動員と分化,および付随血管の発達に不可欠です.
- TNFR2/p75は,発血後回復の年齢関連の制限となり,血管疾患の潜在的な治療標的となる.
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