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Microarrayed human bone marrow organoids for modeling blood stem cell dynamics.

Sonja Giger1, Moritz Hofer1, Marijana Miljkovic-Licina

  • 1Laboratory of Stem Cell Bioengineering, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.

APL Bioengineering
|July 12, 2022
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Summary
This summary is machine-generated.

Researchers developed a 3D bone marrow organoid (BMO) model. This system effectively mimics bone marrow functions, aiding in leukemia research and drug screening for chemotherapy resistance and stem cell engraftment.

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Area of Science:

  • Biomedical Engineering
  • Hematology
  • Stem Cell Biology

Background:

  • Leukemia patient prognosis is often poor due to chemotherapy-resistant leukemic stem cells (LSCs) or inefficient hematopoietic stem/progenitor cell (HSPC) engraftment.
  • Existing in vitro models do not fully recapitulate the complex microenvironment of native bone marrow (BM).

Purpose of the Study:

  • To develop a scalable 3D in vitro bone marrow organoid (BMO) model.
  • To assess the BMO's ability to mimic native BM structure and function, including cell behavior relevant to leukemia and stem cell transplantation.

Main Methods:

  • Fabrication of BMOs through high-throughput aggregation of endothelial and mesenchymal cells within hydrogel microwells.
  • Characterization of mesenchymal stem cell self-renewal and multilineage potential within the organoids.
  • Analysis of endothelial cell self-organization into vascular networks and subsequent HSPC recruitment via chemokine signaling.
  • Modeling of leukemic stem cell (LSC) migration and engraftment within the BMO system.

Main Results:

  • BMOs successfully recapitulated key structural and cellular components of native BM.
  • Mesenchymal cells maintained partial self-renewal and multilineage potential.
  • Endothelial cells formed functional vessel-like networks that facilitated chemokine-dependent HSPC recruitment.
  • The model allowed for the observation of LSC migration and nesting, similar to in vivo behavior.

Conclusions:

  • The developed 3D BMO system provides a robust and scalable in vitro platform for studying leukemia and stem cell engraftment.
  • This model system holds significant potential for preclinical drug screening and patient-specific assays in hematological malignancies.
  • The BMO facilitates understanding of HSPC homing mechanisms and LSC behavior within a biomimetic environment.