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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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Mitigating oxygen stress enhances aged mouse hematopoietic stem cell numbers and function.

Maegan L Capitano1, Safa F Mohamad1, Scott Cooper1

  • 1Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, USA.

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|January 4, 2021
PubMed
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Collecting and processing aged bone marrow stem cells in low oxygen (hypoxia) improves their function and suitability for transplantation. This method enhances engraftment and normalizes differentiation, making older cells more viable for hematopoietic cell transplantation.

Keywords:
AgingBone marrow transplantationHematologyHematopoietic stem cellshypoxia

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Area of Science:

  • Hematology
  • Stem Cell Biology
  • Gerontology

Background:

  • Aging impairs bone marrow (BM) hematopoietic stem cells (HSCs), reducing their long-term repopulation potential and increasing myeloid bias.
  • Dysfunctional aged HSCs present challenges for hematopoietic cell transplantation (HCT).
  • BM HSCs normally reside in a hypoxic environment but are processed in ambient air (21% O2).

Purpose of the Study:

  • To investigate the impact of hypoxic collection and processing on aged BM HSC function.
  • To determine if hypoxia can mitigate age-related decline in HSCs for HCT applications.

Main Methods:

  • Collected and processed young and aged mouse BM HSCs under hypoxic (3% O2) and ambient air (21% O2) conditions.
  • Assessed HSC number and function using limiting dilution analysis.
  • Evaluated engraftment capability via competitive transplantation assays.
  • Analyzed myeloid-to-lymphoid differentiation ratios.

Main Results:

  • Hypoxic collection/processing increased the number of both young and aged BM HSCs compared to ambient air processing.
  • Aged BM collected and processed under hypoxia showed enhanced engraftment and contained more functional HSCs.
  • Hypoxic processing normalized the myeloid-to-lymphoid differentiation ratio in aged BM HSCs.

Conclusions:

  • Collecting and processing aged BM HSCs under hypoxia significantly enhances their functional activity and engraftment potential.
  • Hypoxia mitigates the negative effects of ambient air exposure on aged HSCs, reducing cellular stress.
  • Hypoxic processing offers a strategy to improve the utilization of aged donor BM for hematopoietic cell transplantation.