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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...
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...
Lifecycle of Erythrocytes01:22

Lifecycle of Erythrocytes

Erythrocytes, also known as red blood cells, constantly move through blood capillaries. As a result, they damage their plasma membrane due to the continuous friction. Typically, after 100 to 120 days, erythrocytes become rigid and fragile as they wear out. As they pass through small vessels in the spleen and liver, they can get trapped and break apart into fragments.
The resident phagocytic macrophages deal with these damaged cells by engulfing them and separating their globin and heme groups.
Structure and Function of Erythrocytes01:29

Structure and Function of Erythrocytes

There are between 4.2 and 6 million erythrocytes, also known as red blood cells, in every microliter of blood. These cells are small, flattened biconcave discs with centers that are depressed.
The erythrocyte plasma membrane is associated with proteins such as spectrin, which forms a flexible cytoplasmic meshwork. This meshwork allows erythrocytes to twist, turn, become cup-shaped, and regain their biconcave shape as they pass through narrow capillaries. Additionally, erythrocytes can form...
Hematopoiesis01:21

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...
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: Jul 7, 2026

A Comprehensive Pipeline to Assess the Efficiency of Human Erythropoiesis In Vitro and Ex Vivo
08:53

A Comprehensive Pipeline to Assess the Efficiency of Human Erythropoiesis In Vitro and Ex Vivo

Published on: January 10, 2025

The erythroblastic island.

Deepa Manwani1, James J Bieker

  • 1Schneider Children's Hospital, New York, NY 11040, USA.

Current Topics in Developmental Biology
|February 20, 2008
PubMed
Summary
This summary is machine-generated.

Erythroblastic islands, with central macrophages and surrounding erythroblasts, are vital for red blood cell development. Macrophages nurture erythroblasts, aid in nucleus removal, and regulate cell growth, crucial for erythropoiesis.

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Identification of a Murine Erythroblast Subpopulation Enriched in Enucleating Events by Multi-spectral Imaging Flow Cytometry
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Identification of a Murine Erythroblast Subpopulation Enriched in Enucleating Events by Multi-spectral Imaging Flow Cytometry

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Identification and Isolation of Burst-Forming Unit and Colony-Forming Unit Erythroid Progenitors from Mouse Tissue by Flow Cytometry
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Identification and Isolation of Burst-Forming Unit and Colony-Forming Unit Erythroid Progenitors from Mouse Tissue by Flow Cytometry

Published on: November 4, 2022

Related Experiment Videos

Last Updated: Jul 7, 2026

A Comprehensive Pipeline to Assess the Efficiency of Human Erythropoiesis In Vitro and Ex Vivo
08:53

A Comprehensive Pipeline to Assess the Efficiency of Human Erythropoiesis In Vitro and Ex Vivo

Published on: January 10, 2025

Identification of a Murine Erythroblast Subpopulation Enriched in Enucleating Events by Multi-spectral Imaging Flow Cytometry
09:40

Identification of a Murine Erythroblast Subpopulation Enriched in Enucleating Events by Multi-spectral Imaging Flow Cytometry

Published on: June 6, 2014

Identification and Isolation of Burst-Forming Unit and Colony-Forming Unit Erythroid Progenitors from Mouse Tissue by Flow Cytometry
08:31

Identification and Isolation of Burst-Forming Unit and Colony-Forming Unit Erythroid Progenitors from Mouse Tissue by Flow Cytometry

Published on: November 4, 2022

Area of Science:

  • Hematology
  • Cell Biology
  • Microenvironment Biology

Background:

  • Erythroblastic islands are specialized microenvironments essential for mammalian red blood cell production.
  • These structures comprise a central macrophage nurse cell and surrounding erythroblasts.
  • Cell interactions within these islands are critical for erythroid maturation.

Purpose of the Study:

  • To outline the mechanisms by which erythroblastic islands support erythropoiesis.
  • To review the historical discovery of erythroblastic islands.
  • To highlight key unanswered questions in the field.

Main Methods:

  • This chapter synthesizes existing literature and research findings.
  • It focuses on the functional roles of macrophages and erythroblasts within the island.
  • Analysis of cellular interactions, signaling pathways, and apoptosis modulation is discussed.

Main Results:

  • Macrophages act as nurse cells, providing signals and nutrients for erythroblast proliferation and survival.
  • Macrophages phagocytose extruded erythroblast nuclei and play a role in enucleation.
  • Adhesive interactions between macrophages and erythroblasts maintain island integrity and regulate gene expression.

Conclusions:

  • Erythroblastic islands are crucial for efficient erythropoiesis through intricate cell-cell communication and support.
  • The unique properties of central macrophages make them ideal nurse cells.
  • Further research is needed to fully elucidate the complex regulatory mechanisms within these microenvironments.