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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...

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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.
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Multipotency of Hematopoietic Stem Cells

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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...

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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...

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Related Experiment Video

Updated: Jul 4, 2026

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

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

Published on: July 8, 2012

Cytokines regulating hematopoietic stem cell function.

Cheng C Zhang¹, Harvey F Lodish

¹Department of Physiology, University of Texas Southwestern Medical Center, Dallas, Texas, USA.

Current Opinion in Hematology

|June 10, 2008

Summary

This summary is machine-generated.

New cytokines and hormones regulate hematopoietic stem cell (HSC) fate, including self-renewal and differentiation. Understanding these extrinsic factors is key to controlling HSC behavior for therapeutic applications.

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Flow Cytometry Analysis of Murine Bone Marrow Hematopoietic Stem and Progenitor Cells and Stromal Niche Cells

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Published on: September 28, 2022

Area of Science:

Hematology
Stem Cell Biology
Molecular Biology

Background:

Hematopoietic stem cells (HSCs) exhibit multiple fates: quiescence, self-renewal, differentiation, apoptosis, and niche mobilization.
These processes are tightly regulated by cytokines and hormones binding to HSC receptors.

Purpose of the Study:

To review recent advances in identifying novel HSC-supportive cytokines.
To elucidate the mechanisms by which these cytokines control HSC fate decisions.

Main Methods:

Identification of extrinsic factors stimulating ex-vivo HSC expansion.
Experimental approaches including forward genetic screening and transcriptional profiling.
Analysis of HSCs with activated or suppressed cytokine signaling pathways.

Main Results:

Novel extrinsic factors promoting ex-vivo HSC expansion have been identified.
Complexities in HSC signal transduction and cell-fate choice are revealed through manipulating cytokine pathways.
Recent studies highlight the intricate interplay of extrinsic factors in regulating HSC behavior.

Conclusions:

Genetically modified mouse models and improved in-vitro culture systems are crucial for studying HSC regulation.
Further research will elucidate cytokine functions and the mechanisms of extrinsic factor control over HSC signal transduction and fate.
Understanding these complex regulatory mechanisms is vital for advancing HSC-based therapies.