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Related Concept Videos

Overview of the Vascular System01:20

Overview of the Vascular System

The vascular system comprises an extensive network of arteries, capillaries, and veins. The vascular system can be broadly divided into the blood and lymphatic systems. Typically, blood vessels can be categorized into three histological regions: tunica intima, tunica media, and tunica adventitia. The tunica intima consists of a single layer of endothelial cells attached to the basal lamina. Underlying the basal lamina is a connective tissue layer and an elastic lamina that gives stability and...
Mechanism of Angiogenesis01:10

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 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...
Development of Blood Vessels01:07

Development of Blood Vessels

The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...

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Related Experiment Video

Updated: May 11, 2026

A Method for Labeling Vasculature in Embryonic Mice
09:58

A Method for Labeling Vasculature in Embryonic Mice

Published on: October 7, 2011

Endothelial cells and VEGF in vascular development.

Leigh Coultas1, Kallayanee Chawengsaksophak, Janet Rossant

  • 1The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, M5G 1X8 Canada.

Nature
|December 16, 2005
PubMed
Summary

Vascular system development relies on internal and external cues. Genetic studies reveal sensitivity to mutations, offering therapeutic targets but also potential side effects for anti-angiogenic therapies.

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Last Updated: May 11, 2026

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • Vascular system development involves complex patterning.
  • This process is influenced by intrinsic and extrinsic factors.
  • Genetic disruptions significantly impact vascularization.

Purpose of the Study:

  • To summarize key findings in vascular system development.
  • To highlight genetic targets for therapeutic interventions.
  • To discuss implications for anti-angiogenic therapies.

Main Methods:

  • Review of mutational studies in mice and fish.
  • Analysis of genetic disruption effects on vascular patterning.
  • Examination of vascular endothelial growth factor roles.

Main Results:

  • Vascular system development is sensitive to genetic disruption.
  • Mutational studies identify potential therapeutic targets.
  • Non-vascular roles of vascular endothelial growth factor are recognized.

Conclusions:

  • Understanding vascular development is crucial for targeted therapies.
  • Potential side effects of anti-angiogenic therapies need consideration.
  • New therapeutic targets are required for vascular-related conditions.