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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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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.
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Overview of the Vascular System01:20

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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...
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The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...
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Cranial Bones: Lateral View01:27

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The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
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Isolation and Culture of Endothelial Cells from the Embryonic Forebrain
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Endothelial cells during craniofacial development: Populating and patterning the head.

Hiba Asrar1, Abigail S Tucker1

  • 1Centre for Craniofacial and Regenerative Biology, Faculty of Dentistry, Oral and Craniofacial Sciences, Guy's Hospital, Kings College London, London, United Kingdom.

Frontiers in Bioengineering and Biotechnology
|September 15, 2022
PubMed
Summary
This summary is machine-generated.

Endothelial cells guide craniofacial tissue development. Understanding their origin, migration, and signaling pathways is crucial for tissue engineering and regenerative medicine applications.

Keywords:
angiogenesiscell signallingglandneural cresttoothvascular biologyvasculogenesis

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Area of Science:

  • Developmental Biology
  • Vascular Biology
  • Craniofacial Biology

Background:

  • Endothelial cells form the vascular framework, essential for tissue function and development.
  • Recent findings show endothelial cells instruct tissue morphogenesis and differentiation.
  • Vascularization is critical for successful tissue engineering and organ construction.

Purpose of the Study:

  • To review the origin and migration of craniofacial endothelial cells.
  • To examine how these cells influence craniofacial tissue development.
  • To explore interactions with cranial neural crest and craniofacial organs.

Main Methods:

  • Review of existing research on endothelial cell biology.
  • Analysis of signaling pathways regulating endothelial cell-environment interactions.
  • Investigation of methods for studying and manipulating craniofacial vasculature.

Main Results:

  • Endothelial cells play an instructive role in shaping craniofacial tissues.
  • Cross-talk between endothelial cells and cranial neural crest is vital.
  • Specific signaling pathways govern endothelial cell behavior in developing craniofacial structures.

Conclusions:

  • Endothelial cell behavior is critical for craniofacial development.
  • Understanding craniofacial vasculature is key for regenerative medicine.
  • Novel methods are advancing the study of craniofacial vascular networks.