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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...

Lineage Commitment

Lineage Commitment

Commitment is the process whereby stem cells:

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...

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Updated: May 30, 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

Hematopoietic stem and progenitor cell trafficking.

Irina B Mazo¹, Steffen Massberg, Ulrich H von Andrian

¹Department of Pathology, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, USA.

Trends in Immunology

|August 2, 2011

Summary

This summary is machine-generated.

Hematopoietic stem cell (HSC) migration is vital for development and adult health. Understanding the signals controlling HSC trafficking offers potential for new clinical therapies in transplantation and immune response.

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Simultaneous Assessment of Kinship, Division Number, and Phenotype via Flow Cytometry for Hematopoietic Stem and Progenitor Cells

Simultaneous Assessment of Kinship, Division Number, and Phenotype via Flow Cytometry for Hematopoietic Stem and Progenitor Cells

Published on: March 24, 2023

Area of Science:

Hematology
Developmental Biology
Immunology

Background:

Hematopoietic stem cells (HSCs) are crucial for blood production throughout life.
HSC trafficking is essential for organ colonization during embryogenesis and maintaining homeostasis in adults.
HSC migration is also critical for bone marrow and stem cell transplantation success.

Purpose of the Study:

To review the molecular and cellular signals governing HSC and hematopoietic progenitor cell trafficking.
To explore the role of HSC trafficking in embryonic development and postnatal life.
To discuss therapeutic strategies for modulating HSC trafficking in clinical settings.

Main Methods:

Literature review of studies on HSC migration.
Analysis of molecular and cellular signaling pathways involved in HSC trafficking.
Discussion of clinical applications and therapeutic potential.

Main Results:

HSC trafficking is a tightly regulated process involving complex signaling networks.
These signals orchestrate HSC movement during development and in adult tissue maintenance.
Modulating these signals presents therapeutic opportunities for various conditions.

Conclusions:

HSC trafficking is fundamental to hematopoiesis and immunity.
A comprehensive understanding of trafficking mechanisms can inform novel therapeutic interventions.
Targeting HSC migration holds promise for improving stem cell transplantation and treating immune disorders.