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Related Concept Videos

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...
Multipotency of Hematopoietic Stem Cells01:19

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...
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...
Lineage Commitment01:21

Lineage Commitment

Commitment is the  process whereby stem cells:
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...

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Related Experiment Video

Updated: May 27, 2026

Phenotypic Analysis and Isolation of Murine Hematopoietic Stem Cells and Lineage-committed Progenitors
12:03

Phenotypic Analysis and Isolation of Murine Hematopoietic Stem Cells and Lineage-committed Progenitors

Published on: July 8, 2012

On how Rac controls hematopoietic stem cell activity.

J A Cancelas1

  • 1Hoxworth Blood Center, University of Cincinnati Academic Health Center, and Stem Cell Program, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati Medical Center, Cincinnati, Ohio, USA. Jose.Cancelas@uc.edu

Transfusion
|November 15, 2011
PubMed
Summary
This summary is machine-generated.

Rac GTPases are crucial molecular switches regulating hematopoietic stem cell (HSC) functions like adhesion and migration. Understanding their roles offers new therapeutic strategies for HSC manipulation in vivo and ex vivo.

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Phenotypic Analysis and Isolation of Murine Hematopoietic Stem Cells and Lineage-committed Progenitors
12:03

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Published on: July 8, 2012

Competitive Transplants to Evaluate Hematopoietic Stem Cell Fitness
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Competitive Transplants to Evaluate Hematopoietic Stem Cell Fitness

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Analysis of Hematopoietic Stem Progenitor Cell Metabolism
12:20

Analysis of Hematopoietic Stem Progenitor Cell Metabolism

Published on: November 9, 2019

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Hematology

Background:

  • Rac GTPases are key regulators of intracellular signaling pathways.
  • They function as molecular switches, controlling cellular processes by responding to external signals.
  • Hematopoietic stem cells (HSCs) rely on these signals for their function within the bone marrow microenvironment.

Purpose of the Study:

  • To review the specific roles of Rac GTPases in hematopoietic stem cells (HSCs).
  • To summarize known HSC functions regulated by Rac GTPases, including adhesion, migration, retention, proliferation, and survival.
  • To highlight the potential of Rac GTPase inhibitors as therapeutic strategies.

Main Methods:

  • Review of existing literature on Rac GTPases and HSCs.
  • Analysis of genetic and pharmacological tools used to study Rac GTPase function.
  • Synthesis of data on Rac GTPase involvement in HSC physiology.

Main Results:

  • Rac GTPases play critical roles in HSC responses to the hematopoietic microenvironment.
  • Specific and redundant functions of Rac GTPases in HSCs have been elucidated.
  • Rac GTPases are integral to HSC adhesion, migration, retention, proliferation, and survival.

Conclusions:

  • Rac GTPases are essential for maintaining HSC function and responding to environmental cues.
  • Targeting Rac GTPase activation with small molecule inhibitors presents novel therapeutic avenues.
  • These inhibitors offer potential for manipulating HSC function both in vivo and ex vivo for therapeutic benefit.