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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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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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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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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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A Culture Method to Maintain Quiescent Human Hematopoietic Stem Cells
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HSC Contribution in Making Steady-State Blood.

Keisuke Ito1, Paul S Frenette2

  • 1Ruth L. and David S. Gottesman Institute for Stem Cell and Regenerative Medicine Research, Albert Einstein College of Medicine, Bronx, NY 10461, USA; Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA; Department of Medicine, Albert Einstein College of Medicine, Bronx, NY 10461, USA; Albert Einstein Cancer Center, Albert Einstein College of Medicine, Bronx, NY 10461, USA; Diabetes Research Center, Albert Einstein College of Medicine, Bronx, NY 10461, USA.

Immunity
|September 23, 2016
PubMed
Summary

Murine hematopoietic stem cells (HSCs) are the primary source for maintaining diverse blood cell production during normal conditions and immune responses. This study clarifies the role of HSCs in multilineage hematopoiesis.

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Area of Science:

  • Hematology
  • Immunology
  • Stem Cell Biology

Background:

  • The origin of blood cells during homeostasis is debated, with questions surrounding the roles of committed progenitors versus multipotent stem cells.
  • Understanding the source of blood cell production is crucial for both normal physiological function and immune system responses.

Purpose of the Study:

  • To investigate the contribution of murine hematopoietic stem cells (HSCs) to the maintenance of multilineage hematopoiesis.
  • To determine if HSCs are the major source of blood cell production in both steady-state conditions and during immune challenges.

Main Methods:

  • The study utilized murine models to track and analyze the activity of hematopoietic stem cells.
  • Experimental designs likely involved assessing cell populations and differentiation potential under various physiological conditions.

Main Results:

  • Sawai et al. (2016) identified murine HSCs as the predominant contributors to multilineage hematopoiesis.
  • This contribution was observed consistently during both steady-state conditions and in response to cytokine stimulation.

Conclusions:

  • Murine HSCs play a critical role in sustaining the production of all blood cell types.
  • The findings resolve controversy regarding the primary source of blood cell replenishment, highlighting HSCs' central function.