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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...

Erythropoiesis

Erythropoiesis

Red blood cells (RBCs) transport oxygen to all body tissues. These cells survive only for 120 days and then need to be replenished. Erythropoiesis is the process of RBC production. In healthy individuals, erythropoiesis ensures all tissues are amply supplied with oxygen. In addition, blood loss due to injury leads to a drop in the physiological oxygen level that will cause erythropoiesis. Any defect in erythropoiesis leads to several physiological disorders, including thalassemia, anemia, and...

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...

Erythropoiesis

Erythropoiesis

Red blood cells (RBCs) transport oxygen to all body tissues. These cells survive only for 120 days and then need to be replenished. Erythropoiesis is the process of RBC production. In healthy individuals, erythropoiesis ensures all tissues are amply supplied with oxygen. In addition, blood loss due to injury leads to a drop in the physiological oxygen level that will cause erythropoiesis. Any defect in erythropoiesis leads to several physiological disorders, including thalassemia, anemia, and...

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Related Experiment Video

Updated: Jul 11, 2026

Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis

Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis

Published on: April 10, 2012

Hematopoiesis

¹Ralph H. Johnson Department of Veterans Affairs Medical Center, Charleston, SC 29401-5799.

The Journal of Allergy and Clinical Immunology

|September 1, 1994

Summary

Hematopoietic stem cells (HSCs) self-renew and differentiate, with lineage decisions being stochastic. Cytokines control progenitor proliferation, with early-acting factors like interleukin-6 triggering dormant HSCs.

Area of Science:

Hematology
Stem Cell Biology
Cellular Signaling

Background:

Hematopoietic stem cells (HSCs) are crucial for continuous blood cell production.
HSCs possess self-renewal and differentiation capabilities into various blood lineages.
Stem cell fate decisions (self-renewal vs. differentiation) are intrinsically stochastic.

Purpose of the Study:

To elucidate the regulatory mechanisms governing hematopoietic stem cell proliferation and lineage commitment.
To identify the specific cytokines involved in controlling progenitor cell survival, expansion, and differentiation.
To understand the role of early-acting and late-acting cytokines in regulating hematopoietic stem cell kinetics.

Main Methods:

Review and synthesis of existing scientific literature on hematopoietic stem cell regulation.

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Analysis of cytokine interactions and their effects on progenitor cell behavior.

Categorization of cytokines based on their stage-specific roles in hematopoiesis.

Main Results:

Progenitor cell proliferation is regulated by interacting cytokines, not solely intrinsic factors.
Late-acting cytokines (e.g., erythropoietin) control committed progenitor maturation.
Early-acting cytokines (e.g., interleukin-6, steel factor) are required to activate dormant primitive progenitors and initiate lymphohemopoietic proliferation.

Conclusions:

Hematopoietic stem cell proliferation and lineage commitment are influenced by a complex interplay of intrinsic stochasticity and extrinsic cytokine signaling.
Distinct sets of cytokines regulate different stages of hematopoietic progenitor development.
Understanding these cytokine networks is key to controlling blood cell production and potential therapeutic interventions.