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Regulation of Angiogenesis and Blood Supply

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 Vessels

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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.
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...

Mechanism of Angiogenesis

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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...

Multipotency of Hematopoietic Stem Cells

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Hematopoiesis

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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...

Production of Formed Elements

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Hemangioblasts are multipotent stem cells originating from the mesoderm. They give rise to hematopoietic stem cells (HSCs), which undergo hematopoiesis to produce all the formed elements of blood. This process is regulated by a complex network of hematopoietic growth factors, including transcription factors, growth factors, and cytokines. These factors stimulate the HSCs to divide and differentiate, though some HSCs remain undifferentiated to maintain a self-renewing pool.
Most HSCs commit to...

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Related Experiment Video

Updated: Jul 8, 2026

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

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

Published on: September 18, 2019

Progenitor cells and vascular disease.

M Jevon¹, A Dorling, P I Hornick

¹Department of Cardiothoracic Surgery, National Heart & Lung Institute, Imperial College London, Hammersmith Hospital, London, UK. m.jevon@imperial.ac.uk

Cell Proliferation

|January 10, 2008

Summary

Vascular progenitor cells, including endothelial and smooth muscle types, reside in various tissues and mobilize to repair damage. Research explores their roles in vascular disease and therapeutic potential.

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Isolation of Endothelial Progenitor Cells from Healthy Volunteers and Their Migratory Potential Influenced by Serum Samples After Cardiac Surgery

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Published on: February 14, 2017

Isolation of Endothelial Progenitor Cells from Human Umbilical Cord Blood

Isolation of Endothelial Progenitor Cells from Human Umbilical Cord Blood

Published on: September 14, 2017

Related Experiment Videos

Last Updated: Jul 8, 2026

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

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

Published on: September 18, 2019

Isolation of Endothelial Progenitor Cells from Healthy Volunteers and Their Migratory Potential Influenced by Serum Samples After Cardiac Surgery

Isolation of Endothelial Progenitor Cells from Healthy Volunteers and Their Migratory Potential Influenced by Serum Samples After Cardiac Surgery

Published on: February 14, 2017

Isolation of Endothelial Progenitor Cells from Human Umbilical Cord Blood

Isolation of Endothelial Progenitor Cells from Human Umbilical Cord Blood

Published on: September 14, 2017

Area of Science:

Cardiovascular Biology
Regenerative Medicine

Background:

Vascular progenitor cells (VPCs) are crucial for vascular homeostasis and disease.
Endothelial progenitor cells (EPCs) and vascular smooth muscle progenitor cells (VSPCs) are key cell types.
Their precise descriptions and roles are still under investigation.

Purpose of the Study:

To review current understanding of VPC biology.
To explore their roles in vascular pathophysiology.
To discuss their therapeutic potential.

Main Methods:

Literature review of studies on VPCs.
Analysis of their differentiation and mobilization.
Examination of their involvement in cardiovascular risk and disease.

Main Results:

VPCs reside in multiple tissues and mobilize upon injury.
EPCs are generally reparative, while VSPCs may contribute to pathology.
Circulating EPC levels correlate inversely with cardiovascular risk factors.

Conclusions:

VPC biology is complex, with distinct roles for EPCs and VSPCs.
EPCs show therapeutic promise, with potential for enhancement.
Further research is needed to elucidate VSPC roles and therapeutic applications.