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Related Concept Videos

Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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Role of Hematopoietic Growth Factors01:28

Role of Hematopoietic Growth Factors

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Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
Thrombopoietin (TPO), mainly released by the liver,...
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Hematopoiesis01:21

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...
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Overview of Hematopoiesis01:20

Overview of Hematopoiesis

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Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
Developmental Phases of Hematopoiesis
Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...
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Multipotency of Hematopoietic Stem Cells01:19

Multipotency of Hematopoietic Stem Cells

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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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Lineage Commitment01:21

Lineage Commitment

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Commitment is the  process whereby stem cells:
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Related Experiment Video

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Application of Aorta-gonad-mesonephros Explant Culture System in Developmental Hematopoiesis
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Cell interactions and cell signaling during hematopoietic development.

C Drevon1, T Jaffredo

  • 1Sorbonne Universités, UPMCUnivParis06, IBPS, UMR7622, Laboratoirede Biologiedu Développement,75005 Paris, France.

Experimental Cell Research
|December 3, 2014
PubMed
Summary
This summary is machine-generated.

Hematopoiesis begins with hematopoietic stem cells (HSCs) forming blood cells. Embryonic development involves tissue interactions and signaling pathways, crucial for HSC formation and function.

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Area of Science:

  • Developmental biology
  • Stem cell biology
  • Hematology

Background:

  • Hematopoiesis generates all blood cell lineages from hematopoietic stem cells (HSCs).
  • Embryonic development involves multiple hematopoietic waves, influenced by tissue interactions and cell signaling.
  • Endothelial cells (ECs) and hematopoietic cells (HCs) originate from mesoderm, particularly in the yolk sac.

Purpose of the Study:

  • To review the differentiation of hemogenic ECs from mesoderm.
  • To explain aortic component assembly and its role in initiating hematopoiesis.
  • To elucidate the early steps of HSC commitment and potential manipulation of adult HSCs.

Main Methods:

  • Review of developmental hematopoiesis mechanisms.
  • Analysis of tissue interactions in embryonic aorta development.
  • Examination of the Notch-Runx1 signaling axis in HSC formation.

Main Results:

  • Hemogenic ECs differentiate from mesoderm.
  • Coordinated aortic assembly establishes polarity, initiating Runx1 expression.
  • The Notch-Runx1 axis modulates the initiation of the hematopoietic program.

Conclusions:

  • Tissue interactions and signaling are critical for embryonic hematopoiesis.
  • Runx1 and Notch signaling are key regulators of HSC production.
  • Understanding early HSC commitment may aid adult HSC manipulation.