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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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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

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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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The cardiovascular system regulates the number of erythrocytes in the bloodstream to ensure optimal oxygen transport. It also prevents over-proliferation of these cells, which helps to maintain blood viscosity and flow rate.
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Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
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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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A Culture Method to Maintain Quiescent Human Hematopoietic Stem Cells
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Long-term adaptation to hypoxia preserves hematopoietic stem cell function.

Jichun Chen1, Ju-Gyeong Kang2, Keyvan Keyvanfar1

  • 1Hematology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA.

Experimental Hematology
|April 28, 2016
PubMed
Summary
This summary is machine-generated.

Reducing oxygen levels to 10% (hypoxia) enhances hematopoietic stem cell (HSC) function and bone marrow cell engraftment. Hypoxic conditions decrease oxidative stress, boosting stem cell integrity and potential therapeutic applications.

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Area of Science:

  • Stem cell biology
  • Hematopoiesis
  • Physiology

Background:

  • Molecular oxygen is essential for life but also drives oxidative stress, linked to disease and aging.
  • Oxidative stress negatively impacts cellular function, including stem cells.

Purpose of the Study:

  • To investigate the effect of hypoxia on hematopoietic stem cell (HSC) function and bone marrow (BM) cell engraftment.
  • To explore the molecular mechanisms underlying hypoxia-induced changes in HSCs.

Main Methods:

  • Mice were housed in normoxia (21% O2) or hypoxia (10% O2).
  • Hematopoietic stem cell function was assessed by bone marrow cell engraftment in irradiated recipients.
  • Quantification of specific stem cell populations (KSL cells) and analysis of gene expression (Gata1, c-Mpl) were performed.

Main Results:

  • Hypoxia significantly increased HSC function and bone marrow cell engraftment compared to normoxia.
  • The number of KSL cells and other hematopoietic stem and progenitor cells increased under hypoxia.
  • KSL cells from hypoxic mice exhibited reduced oxidative stress and increased expression of Gata1 and c-Mpl.

Conclusions:

  • A hypoxic hematopoietic stem cell niche enhances stem cell function and engraftment potential.
  • Hypoxia-induced reduction in oxidative stress and modulation of specific gene expression contribute to improved HSC integrity.
  • Optimizing hypoxic conditions may offer a strategy for preserving stem cell function in vivo.