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December 8, 2025BloodOpen Access

In Vivo postnatal loss of mature osteoblasts creates an immunosuppressive bone marrow microenvironment to permit the engraftment and proliferation of myeloma cells

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Authors

NRNoopur Raje

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Overview

In vivo findings reveal loss of osteoblasts increases myeloma cell engraftment in bone marrow, suggesting new treatment pathways.

Key Points

  • To investigate the role of mature osteoblasts in the immunosuppressive bone marrow microenvironment affecting myeloma cells.
  • Developed an immunocompetent mouse model for postnatal deletion of mature osteoblasts.
  • Administered diphtheria toxin to induce osteoblast loss in OC-Cre/iDTR and control mice.
  • Monitored myeloma cell growth using bioluminescence imaging at various time points after injection.
  • Assessed changes in bone structure and immunosuppressive cell populations in the bone marrow.
  • Significant osteoblast loss observed as early as one week post-diphtheria toxin treatment.
  • Bone imaging showed increased porosity, decreased bone fraction, and altered trabecular characteristics.
  • Myeloma cell engraftment increased by 600-fold in mice without mature osteoblasts after 4 weeks.
  • Immune profiling revealed heightened immunosuppressive cell populations in the bone marrow.

Cite This Study

Noopur Raje (2025) studied this question.

synapsesocial.com/papers/69362f3a4fa91c937236d3b9https://doi.org/10.1182/blood-2025-3957
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Also Consider

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  1. 1A human IL-6–Expressing PDX model of multiple myeloma recapitulates clinical features and supports patient-derived tumor engraftment2025
  2. 2The core role of exosomal mir-21-5p/TGF-β1-CXCL12/RANKL axis in bone marrow microenvironment remodeling in multiple myeloma and targeted intervention strategies2025
  3. 3Altered osteoblast populations dynamics underlie myeloma progression from precursors diseases in bone microenvironment2025
  4. 4P02 | INTERACTION BETWEEN MYELOMA AND BONE MARROW MESENCHYMAL STEM CELLS2026
  5. 5Uncoupled bone remodeling drives myeloma bone disease in Vk*MYC mouse model of multiple myeloma2026