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05:32
In Vivo Osteo-organoid Approach for Harvesting Therapeutic Hematopoietic Stem/Progenitor Cells
Published on: February 16, 2024
694
Spatio-Temporal Bone Remodeling after Hematopoietic Stem Cell Transplantation
Constanze S Schwarz1,2,3, Christian H Bucher3,4, Claudia Schlundt3,4
1Department of Hematology, Oncology and Tumor Immunology, Charité-Universitätsmedizin Berlin, 10117 Berlin, Germany.
International Journal of Molecular Sciences
|January 1, 2021
Summary
Allogeneic stem cell transplants significantly alter bone structure and blood vessels. This immune-mediated bone remodeling highlights the adaptive immune system
Area of Science:
- * Bone Biology and Hematology
- * Immunology and Transplantation
Background:
- * Bone homeostasis relies on intricate interactions between hematopoietic cells and the bone microenvironment.
- * The impact of allogeneic T lymphocyte transfer on bone biology remains incompletely understood.
Purpose of the Study:
- * To investigate the effects of allogeneic T lymphocyte transfer on trabecular and cortical bone structures.
- * To examine osteoblast reconstitution and bone vasculature following hematopoietic stem cell transplantation (HSCT).
Main Methods:
- * Murine model utilizing allogeneic or syngeneic hematopoietic stem cells (HSC) and T lymphocytes.
- * Microcomputed tomography (microCT) and histology for bone structure analysis at 20, 40, and 60 days post-transplant.
- * Flow cytometry and fluorescent staining for monitoring immune cells, bone vasculature, and bone cells.
Main Results:
- * Early bone remodeling, including changes in bone vasculature and cell subsets, observed by day +20 after allogeneic HSCT.
- * Transient increase in trabecular bone number and bone vessel density post-allogeneic HSCT.
- * Cortical thinning, disrupted osteoblast lining, and B lymphocyte loss noted after allogeneic HSCT.
Conclusions:
- * Adoptive transfer of allogeneic HSCs and T lymphocytes induces significant structural and spatial changes in bone tissue homeostasis.
- * Bone marrow cell composition is altered by allogeneic HSCT.
- * The adaptive immune system plays a critical role in maintaining balanced bone biology.
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