関連する実験動画
Updated: Jun 11, 2026

09:58
A Method for Labeling Vasculature in Embryonic Mice
Published on: October 7, 2011
VEGFは,内部オトクリン回路メカニズムによる血液形成性幹細胞の生存を調節する
Hans-Peter Gerber1, Ajay K Malik, Gregg P Solar
1Department of Molecular Oncology, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, USA. gerberhp@gene.com
Nature
|June 28, 2002
まとめ
血管内皮成長因子 (VEGF) は,内部オトクリンループを通じて,血液幹細胞の生存を制御する. 細胞内VEGF受容体シグナル伝達を含むこのメカニズムは,血液形成幹細胞の機能を維持するために重要である.
科学分野:
- 血液学 ヘマトロジ
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
背景:
- 血管内皮成長因子 (VEGF) は,血管形成と血液形成に不可欠です.
- VEGFがこれらの異なるプロセスを規制する正確なメカニズムは不明のままです.
研究 の 目的:
- VEGFが造血幹細胞 (HSC) の生存に影響を与える規制ループを解明する.
- HSCの生存と機能における細胞内対細胞外VEGF受容体シグナル伝達の役割を調査する.
主な方法:
- HSCの生存と機能を評価するためにマウスのVEGFの遺伝子除去.
- VEGF受容体 (VEGFR) タイロシンキナーゼの細胞内小分子阻害剤を使用する.
- 細胞外溶性VEGFR-1を用いて,VEGFシグナル伝達を遮断する.
- VEGFR-2およびVEGFR-1の選択リガンドおよびアゴニストを投与する.
主要な成果:
- ネズミのVEGF遺伝子除去により,HSCの生存率,コロニー形成,およびin vivoの再生が著しく低下しました.
- 細胞内VEGFRチロシンキナーゼ阻害剤は,VEGF遺伝子のデレーション効果をHSCに真似した.
- 溶解性VEGFR-1による細胞外VEGF阻害は,HSCに最小限の影響を及ぼした.
- VEGFR-1アゴニストは,VEGFR-2リガンドと並んで,VEGF欠乏性HSCにおける生存と再定植を助けました.
結論:
- VEGFに依存する細胞内オトクリンループメカニズムは,HSCの生存を調節する.
- この内部信号伝達経路は,細胞外阻害剤に抵抗性があります.
- VEGFR-1は,以前から理解されていた機能とは異なる,血液形成において重要な役割を果たします.
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...
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...
Regulation of Hematopoietic Stem Cells
All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal
Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
Maintenance of the ES Cell State
The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...

