周辺血液の"内皮原始細胞"は,モノサイト/マクロファージから派生し,血管新生成長因子を分泌する
Jalees Rehman1, Jingling Li, Christie M Orschell
1Krannert Institute of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, USA.
Circulation
|March 5, 2003
まとめ
内皮原生細胞 (EPC) は増殖しませんが,血管新生成長因子を分泌し,主にこれらの因子を介して作用し,直接の内皮分化ではありません. これらの発見は,血管の成長を促すための新しい治療戦略を示唆しています.
科学分野:
- 細胞生物学 細胞生物学
- 血管新生研究の研究
- 免疫学 免疫学とは
背景:
- 周辺血液からの内皮原生細胞 (EPC) は,血管新生を促進することができます.
- EPC媒介による血管新生 (内皮分化対成長因子分泌) のメカニズムは不明である.
研究 の 目的:
- EPC媒介による血管新生効果のメカニズムを調査する.
- EPCが増殖し,分化するか,または血管新生因子を分泌するかどうかを判断する.
主な方法:
- アセチル化されたLDL吸収とulex-レクチン結合を用いたヒトEPCと確認されたフェノタイプを分離した.
- EPCの増殖と表面マーカーをフローサイトメトリで分析した.
- 血管新生成長因子に対する測定条件付き介質.
主要な成果:
- 単離されたEPCは主に表情されたモノサイト/マクロファージマーカー (CD14,Mac-1,CD11c) で,内皮 (VE-カデリン) または幹細胞 (AC133,c-kit) マーカーは最小です.
- 培養されたEPCは,調節された単細胞活性化とマクロファージの分化マーカーを示した.
- EPCは有意な増殖を示さなかったが,重要な血管新生因子 (VEGF,HGF,G-CSF,GM-CSF) を分泌した.
結論:
- アセチル-LDL (((+) ユレックス-レクチン (((+)) 細胞 (通常はEPCと呼ばれる) は,主に増殖または重要な内皮分化によってではなく,プロ血管性成長因子を分泌することによって機能します.
- これらの細胞は主にモノサイト/マクロファージから派生しています.
- 血管新生効果は,分泌される因子によって媒介される可能性があり,成長因子ベースの戦略や,不血症治療のための単細胞募集の治療的可能性を示唆しています.
さらに関連する動画
関連する概念動画
Mechanism of Angiogenesis
Blood vessel formation starts early during embryonic development, around day 7. In the extraembryonic yolk sac, mesodermal precursor cells called hemangioblast proliferate and differentiate into angioblast. Angioblasts express vascular endothelial growth factor receptor 2 or VEGFR2, which binds VEGF-A, a proangiogenic factor, guiding blood vessel formation. VEGF signaling promotes angioblasts to form a blood island in the developing embryo. Angioblasts further differentiate, giving rise to...
Regulation of Angiogenesis and Blood Supply
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
Hematopoiesis
The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...
Multipotency of Hematopoietic Stem Cells
The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
Differentiation of Common Myeloid Progenitor Cells
Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
Production of Formed Elements
Hemangioblasts are multipotent stem cells originating from the mesoderm. They give rise to hematopoietic stem cells (HSCs), which undergo hematopoiesis to produce all the formed elements of blood. This process is regulated by a complex network of hematopoietic growth factors, including transcription factors, growth factors, and cytokines. These factors stimulate the HSCs to divide and differentiate, though some HSCs remain undifferentiated to maintain a self-renewing pool.
Most HSCs commit to...
Most HSCs commit to...


