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Related Concept Videos

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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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 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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Multipotency of Hematopoietic Stem Cells01:19

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The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
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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.
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Related Experiment Video

Updated: May 5, 2026

Phenotypic and Functional Characterization of Endothelial Colony Forming Cells Derived from Human Umbilical Cord Blood
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Endothelial progenitor cells.

Aarif Y Khakoo1, Toren Finkel

  • 1National Institutes of Health, National Heart, Lung, and Blood Institute, Cardiovascular Branch, Laboratory of Molecular Biology, Bethesda, Maryland 21284, USA. hakooa@nhlbi.nih.gov

Annual Review of Medicine
|January 22, 2005
PubMed
Summary
This summary is machine-generated.

Endothelial progenitor cells, derived from bone marrow, are crucial for blood vessel formation and health. Research indicates these cells hold significant therapeutic promise for various human diseases.

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Area of Science:

  • Cardiovascular Biology
  • Regenerative Medicine
  • Hematology

Background:

  • Endothelial progenitor cells (EPCs) are circulating cells originating from bone marrow.
  • EPCs play a role in vasculogenesis (new blood vessel formation) and vascular homeostasis (maintaining blood vessel health).
  • The exact markers and functions of EPCs are still under investigation.

Purpose of the Study:

  • To review current experimental findings on endothelial progenitor cells.
  • To discuss the functional characteristics and defining cell surface markers of EPCs.
  • To explore the therapeutic potential of EPCs in human diseases.

Main Methods:

  • Review of experimental results from animal studies.
  • Analysis of data from recent clinical trials.
  • Synthesis of existing literature on EPCs.

Main Results:

  • EPCs are a distinct cell population with roles in blood vessel development and maintenance.
  • Ongoing research aims to precisely define EPC markers and functions.
  • Evidence suggests EPCs have considerable therapeutic applications.

Conclusions:

  • Endothelial progenitor cells are a promising area of research for treating human diseases.
  • Further studies are needed to fully elucidate EPC characteristics and therapeutic efficacy.
  • EPCs represent a potential cornerstone for future regenerative therapies.