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Related Concept Videos

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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Hematopoiesis01:21

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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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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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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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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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Lineage Commitment01:21

Lineage Commitment

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Commitment is the  process whereby stem cells:
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Updated: Jun 10, 2025

Combining Intravital Fluorescent Microscopy IVFM with Genetic Models to Study Engraftment Dynamics of Hematopoietic Cells to Bone Marrow Niches
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The evolving hematopoietic niche during development.

Raúl Sánchez-Lanzas1, Amanda Jiménez-Pompa1, Miguel Ganuza1

  • 1Centre for Haemato-Oncology, Barts Cancer Institute, Queen Mary University of London, London, United Kingdom.

Frontiers in Molecular Biosciences
|October 17, 2024
PubMed
Summary
This summary is machine-generated.

Hematopoietic stem cells (HSCs) migrate from embryonic arteries to fetal organs, forming lifelong blood stem cell pools. Understanding these developmental niches is key for leukemia research and regenerative medicine.

Keywords:
aorta-gonad-mesonephrosbone marrowdevelopmental hematopoiesisfetal liverhematopoietic nicheshematopoietic stem cells

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Area of Science:

  • Developmental Biology
  • Hematology
  • Stem Cell Biology

Background:

  • Mammalian hematopoietic stem cells (HSCs) originate in embryonic arteries and migrate to the fetal liver and bone marrow.
  • Adult HSCs sustain lifelong hematopoiesis, but their developmental niches are poorly understood.
  • Recent studies reveal differences in fetal and adult HSC niches, influenced by inflammation, microbiota, and hormones.

Purpose of the Study:

  • To review current knowledge of HSC niches across ontogeny.
  • To highlight differences between fetal liver, fetal bone marrow, and adult bone marrow niches.
  • To underscore the importance of these microenvironments for understanding HSC development and disease.

Main Methods:

  • Literature review focusing on mouse models, with comparative insights from other vertebrates (birds, zebrafish, humans).
  • Synthesis of recent findings on HSC niche composition and function.
  • Analysis of environmental and developmental factors influencing HSCs.

Main Results:

  • Significant differences exist among fetal liver, fetal bone marrow, and adult bone marrow HSC niches.
  • Inflammation, microbiota, and hormonal factors play crucial roles in regulating HSCs and their niches.
  • The cellular components supporting HSC maturation and expansion vary across developmental stages.

Conclusions:

  • A comprehensive understanding of HSC ontogeny and niches is critical for addressing childhood leukemia origins.
  • Knowledge of HSC development is vital for advancing regenerative medicine, including in vitro HSC production for transplantation.
  • This review consolidates understanding of HSC microenvironments to inform future therapeutic strategies.