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Related Concept Videos

Hematopoiesis01:21

Hematopoiesis

5.1K
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...
5.1K

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Femoral Bone Marrow Aspiration in Live Mice
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Elevated hematopoietic stem cell frequency in mouse alveolar bone marrow.

Kouta Niizuma1, Satoru Morikawa2, Eric Gars3

  • 1Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Genetics, Stanford University School of Medicine, Stanford, CA 94305, USA.

Stem Cell Reports
|December 13, 2024
PubMed
Summary
This summary is machine-generated.

The mandible's alveolar bone marrow (al-BM) contains the most hematopoietic stem cells (HSCs), showing superior engraftment and survival. This unique niche supports higher HSC frequency and offers new insights into hematopoiesis.

Keywords:
HSCsMSCsal-BMalveolar bone marrowbone marrow microenvironmenthematopoietic stem cellsmandiblemesenchymal stromal cellsnicheoncostatin Mquiescenceskeletal stem cellsstem cell frequency

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Area of Science:

  • Hematology
  • Stem Cell Biology
  • Microenvironment Research

Background:

  • Hematopoietic stem cells (HSCs) are vital for blood cell production and reside in specific bone marrow (BM) niches.
  • Existing research often assumes bone marrow niches are uniform across skeletal sites.

Purpose of the Study:

  • To investigate site-specific differences in hematopoietic stem cell frequency and function within the bone marrow.
  • To identify unique microenvironmental factors in different skeletal sites that influence HSC behavior.

Main Methods:

  • Comparative analysis of immunophenotypic HSC frequency across nine skeletal sites.
  • In vivo transplantation assays to assess engraftment potential of HSCs from different BM sites.
  • Evaluation of hematopoietic progenitor cell characteristics, including quiescence and apoptosis, in alveolar BM versus other sites.
  • Characterization of mesenchymal stromal cells and skeletal stem cells within the alveolar BM niche.

Main Results:

  • The alveolar bone marrow (al-BM) in the mandible demonstrated the highest frequency of immunophenotypic HSCs compared to eight other skeletal sites.
  • Transplantation assays showed significantly greater hematopoietic engraftment from al-BM compared to femur, tibia, or pelvis BM.
  • Hematopoietic progenitor cells from al-BM exhibited enhanced quiescence and reduced apoptosis, indicating superior survival and maintenance.
  • al-BM revealed an enrichment of mesenchymal stromal cells and skeletal stem cells, suggesting a more supportive niche environment.

Conclusions:

  • The mandibular al-BM niche possesses unique characteristics that support a higher frequency and superior function of hematopoietic stem cells.
  • These findings challenge the notion of uniform BM niches and highlight the importance of site-specific microenvironments in regulating hematopoiesis.
  • The al-BM niche represents a promising area for further research into stem cell biology and potential therapeutic applications.