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Related Concept Videos

Erythropoiesis01:14

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...
Factors Affecting Erythropoiesis01:24

Factors Affecting Erythropoiesis

The cardiovascular system regulates the number of erythrocytes in the bloodstream to ensure optimal oxygen transport. It also prevents over-proliferation of these cells, which helps to maintain blood viscosity and flow rate.
Several factors influence the erythrocyte production rate, with tissue oxygen level being among the most critical. Intense exercise or high altitudes can cause tissue hypoxia, which triggers the kidneys to release more erythropoietin (EPO) into the bloodstream.
EPO then...
Role of Hematopoietic Growth Factors01:28

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 Hematopoiesis01:20

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 Cells01:01

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...
Disorders of Erythrocytes01:27

Disorders of Erythrocytes

Disorders of erythrocytes, or red blood cells (RBCs), include a range of conditions affecting their number, shape, or function.
Erythrocyte disorders can be broadly categorized into two main types: anemic and polycythemic conditions.
A low oxygen-carrying capacity of the blood due to the loss, lower production, or destruction of erythrocytes is termed anemia. Hemorrhagic anemia, for example, occurs when bleeding from an external wound or internal ulcer reduces erythrocyte counts.
On the other...

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Related Experiment Video

Updated: May 23, 2026

Mouse Fetal Liver Culture System to Dissect Target Gene Functions at the Early and Late Stages of Terminal Erythropoiesis
06:40

Mouse Fetal Liver Culture System to Dissect Target Gene Functions at the Early and Late Stages of Terminal Erythropoiesis

Published on: September 9, 2014

Stimulated erythropoiesis with secondary iron loading leads to a decrease in hepcidin despite an increase in bone

David M Frazer1, Sarah J Wilkins, Deepak Darshan

  • 1Iron Metabolism Laboratory, Queensland Institute of Medical Research, Brisbane, Australia.

British Journal of Haematology
|March 28, 2012
PubMed
Summary

Increased red blood cell production, or erythropoiesis, reduces hepcidin levels despite elevated BMP6 signaling. This suggests erythropoiesis interferes with BMP/SMAD pathway signaling in iron regulation.

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Last Updated: May 23, 2026

Mouse Fetal Liver Culture System to Dissect Target Gene Functions at the Early and Late Stages of Terminal Erythropoiesis
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Published on: September 9, 2014

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09:43

Measurement of Heme Synthesis Levels in Mammalian Cells

Published on: July 9, 2015

Area of Science:

  • Molecular Biology
  • Hematology
  • Physiology

Background:

  • The BMP/SMAD signaling pathway is crucial for maintaining iron homeostasis by regulating hepcidin expression.
  • The precise role of this pathway in hepcidin reduction during increased erythropoiesis and associated iron loading remains unclear.

Purpose of the Study:

  • To investigate the BMP/SMAD signaling pathway's function in the context of stimulated erythropoiesis and secondary iron loading.
  • To examine the pathway's involvement in iron regulation in mouse models mimicking chronic anemia and β-thalassemia intermedia.

Main Methods:

  • Established a mouse model of chronic stimulated erythropoiesis using phenylhydrazine, inducing secondary iron loading.
  • Analyzed BMP/SMAD pathway component expression and SMAD phosphorylation in phenylhydrazine-treated mice and Hbb(th3/+) mice.
  • Quantified liver iron levels and hepatic hepcidin (Hamp) and Bmp6 mRNA expression.

Main Results:

  • Phenylhydrazine treatment progressively increased liver iron and Bmp6 mRNA but decreased hepatic Hamp expression.
  • Increased Bmp6 expression did not correlate with altered SMAD1/5/8 phosphorylation, indicating reduced BMP6 efficacy.
  • Hepcidin levels declined despite unchanged SMAD1/5/8 phosphorylation, suggesting erythropoiesis impairs pSMAD-induced hepcidin production.

Conclusions:

  • Stimulated erythropoiesis diminishes the BMP/SMAD pathway's ability to regulate hepcidin expression, leading to reduced hepcidin levels.
  • The erythroid signal appears to impact BMP/SMAD signaling components and may exert independent effects on iron homeostasis.