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Related Concept Videos

Overview of Hematopoiesis01:20

Overview of Hematopoiesis

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...
Hematopoiesis01:21

Hematopoiesis

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...
Multipotency of Hematopoietic Stem Cells01:19

Multipotency of Hematopoietic Stem Cells

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...
Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

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...
Production of Formed Elements01:34

Production of Formed Elements

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...
Role of Hematopoietic Growth Factors01:28

Role of Hematopoietic Growth Factors

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 Human Bone Marrow 3D Model to Investigate the Dynamics and Interactions Between Resident Cells in Physiological or Tumoral Contexts
09:07

A Human Bone Marrow 3D Model to Investigate the Dynamics and Interactions Between Resident Cells in Physiological or Tumoral Contexts

Published on: December 16, 2022

Human osteoblasts support hematopoietic cell development in vitro.

Yusuke Shiozawa1, Hisami Takenouchi, Tomoko Taguchi

  • 1Department of Developmental Biology, National Research Institute for Child Health and Development, Tokyo, Japan.

Acta Haematologica
|November 29, 2008
PubMed
Summary
This summary is machine-generated.

Human osteoblasts support early hematopoiesis by enabling survival and differentiation of hematopoietic stem cells (HSCs) in vitro. This study reveals osteoblasts

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Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis
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Published on: April 10, 2012

Area of Science:

  • Hematology
  • Stem Cell Biology
  • Bone Biology

Background:

  • Osteoblasts are considered key components of the hematopoietic stem cell niche.
  • The precise role of osteoblasts in supporting hematopoiesis remains incompletely understood.

Purpose of the Study:

  • To investigate the capacity of human osteoblasts to support early hematopoiesis.
  • To explore the interaction between osteoblasts and hematopoietic stem cells.

Main Methods:

  • Co-culture of human CD34+ bone marrow cells with human osteoblasts.
  • Assessment of cell survival, proliferation, and differentiation.
  • Immunohistochemical analysis to detect signaling pathway activation (FAK, AKT).
  • Evaluation of cytokine-enhanced hematopoiesis (SCF, Flt3-L, IL-3).

Main Results:

  • Human osteoblasts supported survival and myeloid differentiation of CD34+ cells without exogenous cytokines.
  • Evidence of FAK and AKT activation in hematopoietic cells adhering to osteoblasts.
  • Specific cytokines distinctly promoted proliferation and differentiation of CD34+ cells in the co-culture system.

Conclusions:

  • Human osteoblasts possess an intrinsic ability to support hematopoietic cell development.
  • Osteoblast-hematopoietic cell interactions involve signaling pathways crucial for hematopoiesis.
  • Co-culture systems with osteoblasts provide a valuable model for studying hematopoiesis.