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Related Concept Videos

Lineage Commitment01:21

Lineage Commitment

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Commitment is the  process whereby stem cells:
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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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Production of Formed Elements01:34

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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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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Overview of Hematopoiesis01:20

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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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Regulation of Hematopoietic Stem Cells01:01

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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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Updated: May 11, 2025

Phenotypic Analysis and Isolation of Murine Hematopoietic Stem Cells and Lineage-committed Progenitors
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Cell Lineage Affiliation During Hematopoiesis.

Geoffrey Brown1

  • 1Department of Biomedical Sciences, School of Infection, Inflammation, and Immunology, College of Medicine and Health, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.

International Journal of Molecular Sciences
|April 17, 2025
PubMed
Summary

Hematopoietic stem cells (HSCs) generate diverse blood cells. This review explores when HSCs commit to specific lineages, questioning if it happens early or late in development.

Keywords:
differentiationhematopoiesishematopoietic stem cellslineage affiliationself-renewal

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Area of Science:

  • Hematology
  • Developmental Biology
  • Stem Cell Biology

Background:

  • Hematopoietic stem cells (HSCs) are crucial for generating mature blood cells in adults.
  • Extensive research has established foundational principles in HSC development and application.
  • Current understanding faces uncertainties regarding the timing and mechanisms of HSC lineage commitment.

Purpose of the Study:

  • To examine the developmental pathways of hematopoietic stem cells (HSCs).
  • To investigate the timing of HSC lineage affiliation.
  • To explore the self-renewal capacity of lineage-affiliated HSCs in hematopoiesis.

Main Methods:

  • Review of existing literature on hematopoietic stem cell development.
  • Analysis of contrasting models for HSC lineage commitment.
  • Examination of self-renewal and contribution to hematopoiesis.

Main Results:

  • Two primary models of HSC lineage commitment are discussed: late, stepwise commitment versus early commitment within HSCs.
  • The extent of self-renewal by lineage-affiliated HSCs remains a key consideration.
  • The continuous development model from early lineage-affiliated HSCs is contrasted with stepwise differentiation.

Conclusions:

  • Understanding the precise timing of HSC lineage commitment is critical for hematopoiesis.
  • Further research is needed to clarify whether lineage commitment occurs early or late in HSC development.
  • The self-renewal potential of lineage-affiliated HSCs significantly impacts their contribution to blood cell formation.