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Lineage Commitment

Commitment is the  process whereby stem cells:
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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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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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Hemangioblasts are multipotent stem cells originating from the mesoderm. They give rise to hematopoietic stem cells (HSCs), which undergo hematopoiesis to produce all the formed elements of blood. This process is regulated by a complex network of hematopoietic growth factors, including transcription factors, growth factors, and cytokines. These factors stimulate the HSCs to divide and differentiate, though some HSCs remain undifferentiated to maintain a self-renewing pool.
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AML1-ETO reprograms hematopoietic cell fate by downregulating scl expression.

Jing-Ruey J Yeh1, Kathleen M Munson, Yvonne L Chao

  • 1Developmental Biology Laboratory, Cardiovascular Research Center, Massachusetts General Hospital, Charlestown, MA 02129, USA. jyeh1@partners.org

Development (Cambridge, England)
|December 25, 2007
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A new zebrafish model with the AML1-ETO gene shows how this oncogene causes acute myelogenous leukemia (AML) by altering blood cell development. Restoring the scl gene or using a specific inhibitor can reverse these effects.

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Published on: November 11, 2014

Area of Science:

  • Hematology
  • Oncology
  • Developmental Biology

Background:

  • Acute myelogenous leukemia (AML) is often associated with the AML1-ETO fusion gene.
  • AML1-ETO causes granulocyte precursor accumulation, a hallmark of AML.
  • Understanding AML1-ETO's mechanism is crucial for developing targeted therapies.

Purpose of the Study:

  • To develop a zebrafish model for inducible AML1-ETO expression.
  • To investigate AML1-ETO's role in hematopoietic cell fate determination.
  • To identify key mediators and potential therapeutic targets for AML1-ETO-driven leukemia.

Main Methods:

  • Created a transgenic zebrafish line for inducible AML1-ETO expression.
  • Analyzed changes in gene expression (gata1, pu.1, scl) in myeloerythroid progenitors.
  • Assessed the effects of scl restoration and Trichostatin A treatment.

Main Results:

  • Induced AML1-ETO expression in zebrafish recapitulated key aspects of human AML.
  • AML1-ETO redirected myeloerythroid progenitors from erythroid to granulocytic fate.
  • The scl gene was identified as a critical mediator, with its downregulation essential for AML1-ETO's effects.

Conclusions:

  • Scl is a key mediator in AML1-ETO's reprogramming of hematopoietic cell fate.
  • The zebrafish model provides a platform for studying AML1-ETO signaling in vivo.
  • Histone deacetylase inhibitors like Trichostatin A show therapeutic potential by restoring gene expression and ameliorating AML phenotypes.