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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...

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...

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...

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...

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...

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: Jul 4, 2026

Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis

Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis

Published on: April 10, 2012

Pulmonary extramedullary hematopoiesis.

Mark Rollin Bowling¹, Carlton Gregory Cauthen, Christopher David Perry

¹Department of Internal Medicine, Section on Pulmonary and Critical Care, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157, USA. MBowling@wfumbc.edu

Journal of Thoracic Imaging

|June 4, 2008

Summary

This summary is machine-generated.

Extramedullary hematopoiesis (EMH) is blood cell formation outside bone marrow, often in the lungs. This review covers causes, diagnosis, and treatment of this rare pulmonary condition.

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Area of Science:

Pulmonary Medicine
Hematology
Radiology

Background:

Extramedullary hematopoiesis (EMH) involves blood cell development outside the bone marrow.
Pulmonary and pleural EMH are of significant interest to chest physicians and radiologists.
Most pulmonary EMH cases are secondary to conditions like myeloproliferative disorders or hemolytic anemias.

Observation:

This article presents a case report of pulmonary EMH.
It includes a comprehensive literature review on the topic.
Focus is placed on etiology, clinical presentation, pathophysiology, diagnosis, and therapy.

Findings:

Pulmonary EMH is an uncommon disorder.
Secondary causes are the most frequent etiology.
A multidisciplinary approach is crucial for diagnosis and management.

Implications:

Enhanced understanding of pulmonary EMH etiology and presentation.
Improved diagnostic strategies for radiologists and clinicians.
Guidance on therapeutic interventions for this rare condition.