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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...
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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...
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相关实验视频

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Angiogenesis in the Ischemic Rat Lung
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急性三维缺氧调节血管生成

Dimitris Ntekoumes1,2, Jiyeon Song1, Haohao Liu1

  • 1Department of Biomedical Engineering, Duke University, Durham, NC, 27708, USA.

Advanced healthcare materials
|December 3, 2024
PubMed
概括

一种新的水凝允许控制,短期低氧 (低氧) 暴露,促进血管生长. 这种方法揭示了反应性氧物种,而不是标准因素,驱动了这种增强的血管生成.

关键词:
血管新生是因为血管新生.它们是内皮细胞的内皮细胞.这是一种水凝.缺氧 缺氧是指缺氧的情况.有活性氧物种的反应性氧物种.

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Three-dimensional Angiogenesis Assay System using Co-culture Spheroids Formed by Endothelial Colony Forming Cells and Mesenchymal Stem Cells
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Three-dimensional Angiogenesis Assay System using Co-culture Spheroids Formed by Endothelial Colony Forming Cells and Mesenchymal Stem Cells

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Author Spotlight: Investigating Angiogenesis and Vessel Permeability Through a Modified Matrix Gel Plug Assay
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Author Spotlight: Investigating Angiogenesis and Vessel Permeability Through a Modified Matrix Gel Plug Assay

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相关实验视频

Last Updated: Jun 6, 2025

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Three-dimensional Angiogenesis Assay System using Co-culture Spheroids Formed by Endothelial Colony Forming Cells and Mesenchymal Stem Cells
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Author Spotlight: Investigating Angiogenesis and Vessel Permeability Through a Modified Matrix Gel Plug Assay
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856

科学领域:

  • 生物材料科学 生物材料科学
  • 血管生物学 血管生物学
  • 细胞生理学 细胞生理学

背景情况:

  • 缺氧,或低氧,触发了各种各样的组织反应.
  • 由于急性缺氧的短暂性质,了解急性缺氧的影响是有限的.
  • 现有的模型难以精确控制短期低氧条件.

研究的目的:

  • 开发一种新的水凝平台,用于研究急性按需缺氧.
  • 为了研究急性中度缺氧对血管生成的影响.
  • 阐明低氧诱导的血管性反应背后的分子机制.

主要方法:

  • 一种新的凝-德克斯 (Gel-Dex) 水凝的制造.
  • 从氧气消耗中解脱水凝形成,以控制缺氧.
  • 使用3D内皮球体来评估血管发芽.
  • 测量细胞迁移,增殖和血管生成因子.

主要成果:

  • 在没有机械降解的情况下,Gel-Dex水凝成功创造了急性中度低氧条件.
  • 急性缺氧显著增强了内皮细胞的迁移,增殖和血管发芽.
  • 亲血管效应是由反应性氧物种 (ROS) 介导的,独立于缺氧诱导因素.
  • 确定了依赖ROS的矩阵金属蛋白酶活性作为发芽的关键媒介.

结论:

  • 凝-Dex水凝为研究"按需"急性缺氧提供了一个多功能平台.
  • 急性缺氧通过ROS介导的途径促进血管生成.
  • 这项研究提供了关于ROS在血管发育中的作用的见解,并且在传感技术中具有潜在的应用.