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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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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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Lineage Commitment

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Commitment is the  process whereby stem cells:
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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).
Developmental Phases of Hematopoiesis
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Multipotency of Hematopoietic Stem Cells01:19

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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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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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Clonal Hematopoiesis, Inflammation, and Hematologic Malignancy.

Rashmi Kanagal-Shamanna1, David B Beck2,3, Katherine R Calvo4,5

  • 1Department of Hematopathology and Molecular Diagnostics, Division of Pathology and Laboratory Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.

Annual Review of Pathology
|October 13, 2023
PubMed
Summary
This summary is machine-generated.

Somatic mutations in blood accumulate with age, influencing benign and malignant diseases. This review covers clonal hematopoiesis and related inflammatory and hematologic disorders.

Keywords:
MDSUBA1VEXASautoimmuneclonal hematopoiesisinflammationmyelodysplastic syndromeplasma cell neoplasm

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Area of Science:

  • Genetics
  • Hematology
  • Immunology

Background:

  • Somatic mutations are acquired genetic variations accumulating with age.
  • Traditionally linked to cancer, their role in age-related benign diseases is increasingly recognized.

Purpose of the Study:

  • To review somatic mutations in blood and their association with disease.
  • To focus on inflammatory diseases, myelodysplastic syndrome, and related hematologic disorders.

Main Methods:

  • Literature review of somatic mutations in blood.
  • Discussion of clonal hematopoiesis (CH) and its implications.
  • Emphasis on overlapping inflammatory and hematologic conditions.

Main Results:

  • Somatic mutations in blood are linked to various age-related diseases.
  • Clonal hematopoiesis (CH) is a key concept in understanding these mutations.
  • Conditions like VEXAS syndrome, PNH, and aplastic anemia demonstrate overlapping pathologies.

Conclusions:

  • Somatic mutations have significant implications in clinical hematology and pathology.
  • Understanding these mutations is crucial for diagnosing and managing age-related diseases.
  • Further research into somatic mutations will advance clinical practice.