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Hematopoiesis

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...

Role of Hematopoietic Growth Factors

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,...

Overview of Hematopoiesis

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...

Regulation of Hematopoietic Stem Cells

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...

Multipotency of Hematopoietic Stem Cells

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...

Production of Formed Elements

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...

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Related Experiment Video

Updated: Jun 3, 2026

Bioengineering of Humanized Bone Marrow Microenvironments in Mouse and Their Visualization by Live Imaging

Bioengineering of Humanized Bone Marrow Microenvironments in Mouse and Their Visualization by Live Imaging

Published on: August 1, 2017

Osteoprogenitors and the hematopoietic microenvironment.

Paolo Bianco¹, Benedetto Sacchetti, Mara Riminucci

¹Department of Molecular Medicine, La Sapienza University, 00161 Rome, Italy; Biomedical Science Park San Raffaele, 00128 Rome, Italy. paolo.bianco@uniroma1.it

Best Practice & Research. Clinical Haematology

|March 15, 2011

Summary

This summary is machine-generated.

Skeletal progenitor cells in bone marrow are key organizers of the hematopoietic microenvironment. These cells, also known as mesenchymal stem cells, dynamically direct blood cell niches and interact with hematopoietic stem cells.

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In Vivo Osteo-organoid Approach for Harvesting Therapeutic Hematopoietic Stem/Progenitor Cells

In Vivo Osteo-organoid Approach for Harvesting Therapeutic Hematopoietic Stem/Progenitor Cells

Published on: February 16, 2024

Area of Science:

Hematology
Stem Cell Biology
Skeletal Biology

Background:

Mesenchymal stem cells (MSCs), identified as skeletal progenitor cells in bone marrow, express CD146 and reside in adventitial reticular cells.
These cells possess the inherent ability to shape the hematopoietic microenvironment.

Purpose of the Study:

To elucidate the role of skeletal progenitor cells in organizing the hematopoietic microenvironment.
To reconcile the dual locations of hematopoietic stem cell niches (endosteal surfaces and sinusoidal walls).

Main Methods:

Identification of skeletal progenitor cells based on anatomical and phenotypic characteristics (CD146 expression).
Observation of cell association with sinusoids and self-renewal into stromal reticular cells.

Main Results:

Skeletal progenitor cells generate osteoblasts and dynamically direct sinusoid assembly.
These cells are pivotal organizers of the hematopoietic microenvironment, linking skeletal and hematopoietic functions.
Their sinusoidal location and osteogenic capacity unify the concept of stem cell niches.

Conclusions:

Skeletal progenitor cells are crucial for maintaining the hematopoietic stem cell niche.
The interaction between bone and bone marrow involves two distinct stem cell populations within the same niche.
This perspective highlights the dynamic, stem cell-driven nature of the hematopoietic microenvironment.