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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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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
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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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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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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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Aplastic anemia, cellular and molecular aspects.

Mohammad R Javan1, Najmaldin Saki2, Bahareh Moghimian-Boroujeni2

  • 1Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Iranian Blood Transfusion Organization (IBTO), Tehran, Iran.

Cell Biology International
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Summary

Aplastic anemia involves stem cell defects and immune system damage, leading to reduced blood cell production. Understanding these factors is crucial for developing effective treatments for this idiopathic bone marrow disorder.

Keywords:
aplastic anemiacytokineshematopoietic stem cellsimmune systemmesenchymal stromal cellssignaling pathway

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Area of Science:

  • Hematology
  • Immunology
  • Stem Cell Biology

Background:

  • Aplastic anemia (AA) is an autoimmune disorder causing pancytopenia.
  • The precise pathogenesis of AA remains idiopathic, despite potential environmental and genetic links.

Purpose of the Study:

  • To review the literature on Aplastic Anemia pathogenesis, focusing on hematopoietic stem cells, signaling pathways, cytokines, and immune cells.
  • To elucidate the cellular and molecular mechanisms underlying AA.

Main Methods:

  • Literature review of Pubmed database from 2002-2021.
  • Keywords used: "Aplastic Anemia," "Hematopoietic Stem Cells niche," "Signaling pathway," "Cytokines," and "Immuno cells."

Main Results:

  • AA involves quantitative stem cell defects and qualitative functional abnormalities.
  • Increased inflammatory cytokines alter T lymphocyte ratios, contributing to disease progression.
  • Immune system damage leads to increased apoptosis in hematopoietic progenitor cells.

Conclusions:

  • Both hematopoietic stem cells and mesenchymal stromal cells are impaired in AA.
  • The disease results from damage to hematopoietic cells and their protective niche by various cellular and molecular factors.
  • Understanding these complex interactions is key to addressing AA.