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Overview of Hematopoiesis01:20

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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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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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Regulation of Hematopoietic Stem Cells01:01

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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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Bone marrow transplant is a potential cure for several diseases, including cancer and specific genetic disorders. Notably, this procedure is applicable for patients suffering from aplastic anemia, certain types of leukemia, severe combined immunodeficiency disease (SCID), Hodgkin's disease, non-Hodgkin's lymphoma, multiple myeloma, thalassemia, sickle-cell disease, and certain cancers.
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Disorders of erythrocytes, or red blood cells (RBCs), include a range of conditions affecting their number, shape, or function.
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[Quo vadis hematology?]

Zsolt Matula1, Gyöngyi Kudlik1, Veronika Urbán S2

  • 1Enzimológiai Intézet, Magyar Tudományos Akadémia, Természettudományi Kutatóközpont Budapest.

Orvosi Hetilap
|November 8, 2016
PubMed
Summary

The classical hierarchical model of hematopoiesis is challenged by new findings. Heterogeneous hematopoietic stem cell subsets with distinct behaviors and developmental regulation are now recognized.

Keywords:
clonal trackingegyensúlyi vérképzéselődsejtekhaematopoesishaematopoeticus őssejtekhematopoiesishematopoietic stem cellsprogenitor cellssejtfejlődésisor-követéssejtszintű DNS/RNS szekvenálássingle-cell DNA/RNA sequencingsteady-state hematopoiesis

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Area of Science:

  • Hematology
  • Developmental Biology
  • Stem Cell Biology

Background:

  • The traditional view compartmentalizes hematopoietic stem cells (HSCs) into multipotent, progenitor, and precursor populations.
  • Recent research indicates this hierarchical model is insufficient to explain hematopoiesis.
  • Emerging evidence points to heterogeneity within HSC populations.

Purpose of the Study:

  • To review recent findings that challenge the classical hierarchical model of hematopoiesis.
  • To highlight the existence and roles of distinct HSC subsets.
  • To discuss the implications of these findings for understanding hematopoiesis in health and disease.

Main Methods:

  • Review of recent scientific literature and genetic experiments in mice.
  • Analysis of findings related to HSC subset ratios and their developmental regulation.
  • Examination of the role of committed progenitor cells in adult hematopoiesis.

Main Results:

  • Identification of three HSC subsets: myeloid-biased (α), balanced (β), and lymphoid-biased (γ/δ).
  • Demonstration that HSC subset ratios are developmentally regulated and change with age (α-HSCs increase in aged individuals).
  • Discovery of long-lived committed progenitor cells driving adult hematopoiesis and differences in post-transplantation hematopoiesis.

Conclusions:

  • Hematopoiesis architecture is more complex than previously thought, involving distinct HSC subsets.
  • Understanding HSC heterogeneity and progenitor cell roles is crucial for regulating hematopoiesis.
  • These insights have significant implications for both normal hematopoiesis and related diseases.