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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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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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Hematopoiesis

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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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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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Stem cell therapy is a method used in regenerative medicine to repair and restore function to damaged tissues and organs. Stem cells have the potential to proliferate and differentiate into various tissue types, making them ideal candidates for tissue regeneration. For example, hematopoietic stem cell transplants are commonly used in blood cancer treatment to replenish damaged bone marrow and restore healthy blood cells.
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Aging01:26

Aging

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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Author Spotlight: Advancing Hematopoietic Research Using Stromal Cell Isolation for Single Cell Sequencing
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The peripheral nervous system in hematopoietic stem cell aging.

Leopold Böhm1, Dario-Lucas Helbing1, Nova Oraha1

  • 1Leibniz Institute on Aging, Fritz Lipmann Institute, 07745, Jena, Germany; Institute of Molecular Cell Biology, Faculty of Medicine, University Hospital Jena and Friedrich Schiller University Jena, 07745, Jena, Germany.

Mechanisms of Ageing and Development
|August 16, 2020
PubMed
Summary

Aging bone marrow microenvironment changes impact hematopoietic stem cell function. The nervous system

Keywords:
AgeingHaematopoiesisHaematopoietic stem cellsNichePeripheral nerveSchwann cells

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Area of Science:

  • Hematology
  • Stem Cell Biology
  • Aging Research

Background:

  • Hematopoietic stem cell (HSC) function is vital for blood system homeostasis.
  • The bone marrow microenvironment provides extrinsic factors regulating HSCs.
  • Aging alters the bone marrow microenvironment's structure and cellularity, impacting HSCs.

Purpose of the Study:

  • To review the role of the aging bone marrow microenvironment in HSC dysfunction.
  • To highlight the emerging interface between the nervous system and bone marrow in aging.

Main Methods:

  • Literature review focusing on aging, bone marrow microenvironment, and hematopoietic stem cells.
  • Analysis of studies investigating extrinsic regulators of HSCs.
  • Examination of research on the neuro-hematopoietic axis in aging.

Main Results:

  • The bone marrow microenvironment undergoes significant dynamic changes with age.
  • These microenvironmental alterations are key drivers of age-related hematopoietic system decline.
  • The interaction between the peripheral nervous system and bone marrow cells is increasingly recognized in aging.

Conclusions:

  • The aging bone marrow microenvironment significantly impairs hematopoietic stem cell performance.
  • Understanding the neuro-bone marrow interface is crucial for addressing age-related blood disorders.