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Related Concept Videos

Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

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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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Multipotency of Hematopoietic Stem Cells01:19

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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Hematopoiesis01:21

Hematopoiesis

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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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Role of Hematopoietic Growth Factors01:28

Role of Hematopoietic Growth Factors

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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.
Thrombopoietin (TPO), mainly released by the liver,...
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General Transcription Factors01:30

General Transcription Factors

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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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Stem Cell Niche01:26

Stem Cell Niche

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The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...
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Related Experiment Video

Updated: Dec 8, 2025

Identification of Key Factors Regulating Self-renewal and Differentiation in EML Hematopoietic Precursor Cells by RNA-sequencing Analysis
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Identification of Key Factors Regulating Self-renewal and Differentiation in EML Hematopoietic Precursor Cells by RNA-sequencing Analysis

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Multi-layered Spatial Transcriptomics Identify Secretory Factors Promoting Human Hematopoietic Stem Cell Development.

Edie I Crosse1, Sabrina Gordon-Keylock1, Stanislav Rybtsov1

  • 1MRC Centre for Regenerative Medicine, University of Edinburgh, Edinburgh EH16 4UU, UK.

Cell Stem Cell
|September 18, 2020
PubMed
Summary
This summary is machine-generated.

Researchers identified endothelin 1 as a key secreted signal regulating human hematopoietic stem cell (HSC) development in the embryonic aorta. This finding advances understanding of HSC emergence and potential in vitro generation for clinical applications.

Keywords:
AGM regionHSCembryoendothelinhematopoiesissingle cell transcriptomespatial transcriptome

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Hemogenic Reprogramming of Human Fibroblasts by Enforced Expression of Transcription Factors
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Direct Induction of Hemogenic Endothelium and Blood by Overexpression of Transcription Factors in Human Pluripotent Stem Cells
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Last Updated: Dec 8, 2025

Identification of Key Factors Regulating Self-renewal and Differentiation in EML Hematopoietic Precursor Cells by RNA-sequencing Analysis
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Hemogenic Reprogramming of Human Fibroblasts by Enforced Expression of Transcription Factors
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Direct Induction of Hemogenic Endothelium and Blood by Overexpression of Transcription Factors in Human Pluripotent Stem Cells
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Direct Induction of Hemogenic Endothelium and Blood by Overexpression of Transcription Factors in Human Pluripotent Stem Cells

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Area of Science:

  • Developmental biology
  • Hematopoiesis
  • Human embryology

Background:

  • Hematopoietic stem cells (HSCs) originate in the embryonic aorta-gonad-mesonephros (AGM) region.
  • Signaling pathways in model organisms guide HSC emergence ventrally in the dorsal aorta.
  • Mechanisms of human HSC development remain less understood.

Purpose of the Study:

  • To identify secreted signals regulating human HSC development.
  • To investigate spatial transcriptomics and gene expression in the embryonic aorta.

Main Methods:

  • Spatial transcriptomics of dorsoventral aorta signaling.
  • Gene expression profiling of sorted cell populations and single cells.
  • Analysis of ventrally polarized molecular landscape.

Main Results:

  • Identified a subset of aortic endothelial cells with downregulated arterial signature, linked to HSC/progenitor populations.
  • Discovered endothelin 1 as a crucial secreted regulator of human HSC development.
  • Generated gene expression datasets for future in vivo and in vitro studies.

Conclusions:

  • Endothelin 1 is a key secreted regulator of human HSC development.
  • The study provides insights into the molecular landscape of HSC emergence.
  • Generated datasets will facilitate further research on HSC development and generation.