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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

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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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

3.0K
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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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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Related Experiment Video

Updated: Jun 11, 2025

Phenotypic Analysis and Isolation of Murine Hematopoietic Stem Cells and Lineage-committed Progenitors
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Chaotic dynamics for homeostatic hematopoiesis.

Dongya Jia, Emanuel Salazar-Cavazos, Timothy West

    Biorxiv : the Preprint Server for Biology
    |October 7, 2024
    PubMed
    Summary

    Hematopoiesis exhibits chaotic dynamics and large cell count variations. Mathematical modeling reveals how B-cell accumulation can shift these dynamics from chaos to oscillations, offering insights into blood cell regulation.

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    Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis
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    Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis
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    Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis

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    Area of Science:

    • Hematology
    • Systems Biology
    • Dynamical Systems Theory

    Background:

    • Homeostatic hematopoiesis is a complex dynamical process with significant cell quantity and proliferation rate variations.
    • Extensive correlations and anti-correlations exist between different cell types within and between myeloid/lymphoid lineages.
    • All blood cell types display synchronized, albeit rare, proliferation bursts across bone marrow, blood, and spleen.

    Purpose of the Study:

    • To investigate the dynamical features of hematopoiesis, including fluctuations, correlations, and chaotic behaviors.
    • To develop a minimal mathematical model capturing these dynamics.
    • To explain the transition from chaotic to oscillatory blood cell dynamics observed clinically, particularly in conditions like lymphoma.

    Main Methods:

    • Longitudinal study of blood cell counts in healthy mice.
    • Analysis of leukocyte fluctuations for ergodicity and chaotic behavior.
    • Development of a minimal mathematical model for hematopoiesis dynamics.
    • Comparison of mouse cohorts with varying genetic backgrounds and ages.

    Main Results:

    • Leukocyte fluctuations in mice are ergodic and exhibit chaotic behavior with diverse timescales.
    • A mathematical model successfully captured hematopoiesis dynamics (fluctuations, correlations, chaos).
    • Simulations showed B-cell accumulation transitions dynamics from chaos to oscillations.
    • Correlated blood cell fluctuations were observed across different mouse cohorts.

    Conclusions:

    • Hematopoiesis is a chaotic dynamical system with significant cell count variability.
    • Mathematical modeling provides a framework for understanding hematopoiesis dynamics and disease transitions.
    • B-cell accumulation can alter blood cell dynamics from chaos to oscillations, relevant to clinical observations.
    • Correlated blood cell fluctuations are a fundamental aspect of hematopoiesis across diverse conditions.