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Updated: May 9, 2026
06:21
Incorporating Pericytes into an Endothelial Cell Bead Sprouting Assay
Published on: February 16, 2018
血管新生における内皮ノッチ1の重要な役割
Florian P Limbourg1, Kyosuke Takeshita, Freddy Radtke
1Vascular Medicine Research Unit, Brigham & Women's Hospital, and Harvard Medical School, Boston, Mass, USA.
Circulation
|April 6, 2005
まとめ
Notch1シグナリングは,胚の発達,特に内皮内において不可欠である. 内皮に特異的なNotch1欠失は,重度の血管欠陥と胚の致死性を引き起こし,血管形成における重要な役割を強調します.
科学分野:
- 発達生物学 発達生物学とは
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- ノッチ・シグナリングは,様々な組織における細胞の運命決定を調節する.
- Notch1受容体は,胚の発達に不可欠であり,全身の損失が致死性を引き起こします.
- Notch1依存の胚性死亡の原因となる特定の細胞タイプは,以前は知られていませんでした.
研究 の 目的:
- 胚の発達におけるNotch1の重要な役割を媒介する重要な細胞タイプを特定する.
- 特に内皮内のNotch1信号伝達の機能を調査する.
主な方法:
- Tie2CreとNotch1 ((flox/flox) 株を用いて,内皮特異的なNotch1ノックアウトマウスを生成した.
- ミュータント胚における血管新生と血管新生を含む胚の血管発達を分析した.
- 内皮細胞と神経細胞におけるカスパース-3の活性化によるアポプトシスの評価.
主要な成果:
- 内皮に特異的なNotch1の消去は,E10.5.5周辺の胚の死亡率につながった.
- ミュータント胚は,胎盤,卵黄袋,胚自体で深刻な血管の欠陥を示した.
- 欠陥には,血管新生障害,胎盤の迷宮の侵入障害,出血,内皮細胞と神経細胞のアポトーシスの増加が含まれていました.
結論:
- Notch1シグナル伝達は,血管の適切な発達のために,内皮細胞において不可欠な,細胞自律的な役割を果たします.
- これらの発見は,グローバルなNotch1変異体の血管現象型を説明します.
- この研究は,成人における血管新生におけるNotch1の潜在的な臨床的影響を示唆しています.
関連する概念動画
03:14Notch Signaling Pathway
The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
01:10Mechanism 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...
01:24Regulation 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...
03:14Notch Signaling Pathway
The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
01:24Overview of Cell-Matrix Interactions
The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
01:12Role Of Notch Signalling In Intestinal Stem Cell Renewal
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...