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Related Concept Videos

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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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

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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

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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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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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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.
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Related Experiment Video

Updated: Mar 17, 2026

Bioengineering of Humanized Bone Marrow Microenvironments in Mouse and Their Visualization by Live Imaging
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Osteoblasts and The Hematopoietic Microenvironment.

R S Taichman1, M J Reilly1, S G Emerson2

  • 1a Departments of Periodontics , Prevention and Geriatrics, School of Dentistry, University of Michigan , Ann Arbor MI 48109.

Hematology (Amsterdam, Netherlands)
|July 19, 2016
PubMed
Summary
This summary is machine-generated.

Osteoblasts, bone cells, support blood cell production by nurturing hematopoietic stem cells and producing regulatory cytokines. This research highlights their crucial role in maintaining blood cell development within the bone marrow microenvironment.

Keywords:
Osteoblastsbone marrowhematopoiesisstem cells

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Area of Science:

  • Hematology
  • Cell Biology
  • Bone Biology

Background:

  • Bone marrow cells are crucial for both bone production and housing the hematopoietic system.
  • Current research often isolates the study of bone and blood cell production, overlooking their in vivo interaction.

Purpose of the Study:

  • To investigate the role of osteoblast-like cells in supporting hematopoiesis.
  • To explore the interaction between bone cells and hematopoietic stem cells in vivo.

Main Methods:

  • Culturing primitive human hematopoietic progenitors (CD34(+) cells) with human osteoblast-like cells.
  • Analyzing the synthesis of cytokines by osteoblast-like cells.

Main Results:

  • Human osteoblast-like cells demonstrated support for the growth of primitive human hematopoietic progenitors (CD34(+) cells) in both short and long-term cultures.
  • Osteoblast-like cells were found to synthesize multiple cytokines implicated in regulating hematopoiesis.

Conclusions:

  • Osteoblast-like cells play a significant accessory role in supporting hematopoiesis.
  • The close proximity of hematopoietic cells and endosteal cells suggests a critical in vivo role for osteoblasts in hematopoietic cell development.