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Related Concept Videos

Regulation of Angiogenesis and Blood Supply01:24

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...
Mechanism of Angiogenesis01:10

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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...
Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Integrins01:10

Integrins

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Activation of Integrins01:15

Activation of Integrins

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Development of Blood Vessels01:07

Development of Blood Vessels

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Micropatterning and Assembly of 3D Microvessels
13:05

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Published on: September 9, 2016

Endothelial beta1 integrins regulate sprouting and network formation during vascular development.

Daniela Malan1, Daniela Wenzel, Annette Schmidt

  • 1Institute of Physiology I, University of Bonn, Sigmund-Freud-Str. 25, 53127 Bonn, Germany.

Development (Cambridge, England)
|February 25, 2010
PubMed
Summary
This summary is machine-generated.

Beta1 integrins are crucial for blood vessel formation. Their absence in endothelial cells impairs vascular development, leading to defective cell maturation, migration, and survival, impacting angiogenesis.

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Last Updated: Jun 15, 2026

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Published on: September 9, 2016

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06:21

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Published on: February 16, 2018

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Vascular Biology

Background:

  • Beta1 integrins are vital for vascular differentiation and development.
  • Endothelial-specific deletion of beta1 integrins leads to embryonic lethality, necessitating alternative study models.
  • Understanding the molecular mechanisms of beta1 integrin's role in vasculo-angiogenesis is crucial.

Purpose of the Study:

  • To investigate the molecular mechanisms of vascular abnormalities in the absence of beta1 integrins.
  • To elucidate the role of beta1 integrins in endothelial cell and vessel development.
  • To gain insights into vasculo-angiogenesis using beta1-integrin-deficient murine embryonic stem cells.

Main Methods:

  • Utilized beta1-integrin-deficient murine embryonic stem cells to study endothelial cell and vessel development.
  • Analyzed vascular development in mutant embryoid bodies (EBs) compared to wild-type.
  • Assessed endothelial cell maturation, migration, elongation, apoptosis, and proliferation rates.
  • Investigated the role of peNOS and pAKT signaling pathways.

Main Results:

  • Vessel development was severely defective in beta1 integrin(-/-) EBs, with only primitive sprouts forming.
  • Endothelial-specific re-expression of beta1 integrin fully rescued the observed vascular defects.
  • Defective vessel formation was linked to reduced endothelial cell maturation, migration, and elongation.
  • Beta1 integrin deficiency resulted in increased endothelial cell apoptosis and proliferation, mediated by peNOS and pAKT signaling.

Conclusions:

  • Endothelial beta1 integrins are critical determinants of proper vessel formation.
  • The function of beta1 integrins in angiogenesis is mediated through distinct signaling pathways.
  • Beta1 integrins regulate endothelial cell survival and proliferation, essential for vascular development.