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Assessing Cellular Hypoxic Status In Situ Within the Bone Marrow Microenvironment.

Ute Suessbier1, César Nombela-Arrieta2

  • 1Department of Medical Oncology and Hematology, University of Zurich, Zurich, Switzerland.

Methods in Molecular Biology (Clifton, N.J.)
|June 15, 2019
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This study introduces a new method to measure oxygen levels in bone marrow stem cell niches. This technique helps understand how low oxygen environments preserve stem cell function.

Keywords:
HSC nicheHypoxic statusImagingMetabolic stateMicroenvironment

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Area of Science:

  • Hematology
  • Cell Biology
  • Biomedical Engineering

Background:

  • Hematopoietic stem cells (HSCs) reside in specialized bone marrow microenvironments with limited oxygen.
  • Hypoxia in HSC niches is crucial for maintaining stem cell properties via a specific metabolic profile.
  • Understanding oxygenation is key to HSC biology.

Purpose of the Study:

  • To develop a method for quantifying cellular oxygenation status in situ within bone marrow tissues.
  • To investigate the relationship between cell positioning and hypoxic status in the bone marrow microenvironment.

Main Methods:

  • Utilized the nitroimidazole probe pimonidazole as an oxygen mimetic.
  • Pimonidazole irreversibly incorporates into proteins under hypoxic conditions.
  • Employed fluorescently labeled antibodies to detect pimonidazole adducts for indirect assessment of hypoxia.

Main Results:

  • Successfully developed a methodology to indirectly quantify the hypoxic status of individual cells within bone marrow histological sections.
  • Demonstrated the ability to assess intracellular hypoxic status in situ.
  • Enabled the analysis of hypoxic status relative to cell positioning within the bone marrow topography.

Conclusions:

  • The described methodology allows for the indirect quantification of cellular oxygenation in bone marrow niches.
  • This technique is essential for understanding the role of hypoxia in HSC maintenance and function.
  • Further research can utilize this method to explore stem cell biology in low-oxygen environments.