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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...

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...

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...

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...

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...

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,...

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Related Experiment Video

Updated: May 7, 2026

Phenotypic Analysis and Isolation of Murine Hematopoietic Stem Cells and Lineage-committed Progenitors

Phenotypic Analysis and Isolation of Murine Hematopoietic Stem Cells and Lineage-committed Progenitors

Published on: July 8, 2012

Developmental potential and dynamic behavior of hematopoietic stem cells.

I R Lemischka, D H Raulet, R C Mulligan

|June 20, 1986

Summary

Hematopoietic stem cells (HSCs) were genetically marked and transplanted to reveal distinct stem cell behaviors. Few HSC clones dominate hematopoiesis, suggesting sequential activation controls blood cell production.

Area of Science:

Hematology
Stem Cell Biology
Gene Therapy

Background:

Hematopoietic stem cells (HSCs) are crucial for lifelong blood production.
Understanding HSC behavior and regulation is vital for regenerative medicine.
Previous studies have not fully elucidated the clonal dynamics of HSCs in vivo.

Purpose of the Study:

To investigate the clonal composition and behavior of hematopoietic stem cells after transplantation.
To identify mechanisms controlling stem cell utilization in hematopoiesis.
To characterize the contribution of individual stem cell clones to different hematopoietic lineages.

Main Methods:

Retrovirus-mediated gene transfer was used to label hematopoietic stem cells in vitro.
Labeled HSCs were transplanted into lethally irradiated recipient mice.

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Directed Differentiation of Primitive and Definitive Hematopoietic Progenitors from Human Pluripotent Stem Cells

Directed Differentiation of Primitive and Definitive Hematopoietic Progenitors from Human Pluripotent Stem Cells

Published on: November 1, 2017

Isolation Method for Long-Term and Short-Term Hematopoietic Stem Cells

Isolation Method for Long-Term and Short-Term Hematopoietic Stem Cells

Published on: May 19, 2023

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Last Updated: May 7, 2026

Phenotypic Analysis and Isolation of Murine Hematopoietic Stem Cells and Lineage-committed Progenitors

Phenotypic Analysis and Isolation of Murine Hematopoietic Stem Cells and Lineage-committed Progenitors

Published on: July 8, 2012

Directed Differentiation of Primitive and Definitive Hematopoietic Progenitors from Human Pluripotent Stem Cells

Directed Differentiation of Primitive and Definitive Hematopoietic Progenitors from Human Pluripotent Stem Cells

Published on: November 1, 2017

Isolation Method for Long-Term and Short-Term Hematopoietic Stem Cells

Isolation Method for Long-Term and Short-Term Hematopoietic Stem Cells

Published on: May 19, 2023

The fate and contribution of labeled stem cell progeny were tracked over time.

Retransplantation studies were performed to assess stem cell self-renewal and potency.

Main Results:

Demonstrated heterogeneity among stem cells, with some repopulating all lineages and others showing lineage or location specificity.
Identified that a small number of stem cell clones (1-2) account for the majority of mature hematopoietic cells in most recipients.
Retransplantation studies indicated an in vivo mechanism for temporal control of stem cell usage.
Periodic sampling revealed that normal hematopoiesis arises from sequential activation of distinct stem cell clones.

Conclusions:

Hematopoiesis is regulated by the sequential activation of specific stem cell clones, not a uniform contribution from the entire pool.
A limited number of stem cell clones are responsible for maintaining blood cell production.
This clonal behavior suggests a sophisticated in vivo mechanism for managing stem cell resources over time.