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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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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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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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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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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).
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Hematopoietic stem cell lineage specification.

Marie Pouzolles1, Leal Oburoglu, Naomi Taylor

  • 1Institut de Génétique Moléculaire de Montpellier, Centre National de la Recherche Scientifique UMR5535, Université de Montpellier, Montpellier, France.

Current Opinion in Hematology
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PubMed
Summary
This summary is machine-generated.

Hematopoietic stem cells (HSCs) self-renewal and blood production are regulated by the stem cell niche, transcriptional networks, and metabolism. Single-cell studies reveal direct differentiation into unipotent progenitors, not oligopotent states.

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Area of Science:

  • Hematology
  • Stem Cell Biology
  • Molecular Biology

Background:

  • Hematopoietic stem cells (HSCs) are crucial for lifelong blood cell production.
  • Maintaining the balance between HSC self-renewal and differentiation is vital for health.

Purpose of the Study:

  • To review recent advances in understanding HSC regulation.
  • To highlight the roles of the stem cell niche, transcriptional networks, and metabolic pathways.
  • To discuss findings from single-cell resolution studies of hematopoiesis.

Main Methods:

  • Review of current literature on hematopoiesis.
  • Analysis of studies utilizing single-cell resolution techniques.
  • Examination of the interplay between niche, transcription, and metabolism.

Main Results:

  • HSC behavior is dynamically regulated by their perivascular niche.
  • Transcription factors and metabolic pathways govern HSC quiescence and differentiation.
  • Single-cell analyses indicate direct differentiation into unipotent progenitors.

Conclusions:

  • HSC plasticity in blood differentiation is influenced by diverse transcriptional and metabolic pathways.
  • Niche interactions modulate HSC specification under stress and pathological conditions.