Engineering a humanized bone organ model in mice to study bone metastases.

Area of Science:

• Biomedical Engineering
• Oncology
• Tissue Engineering

Background:

• Current in vivo models for human bone tumors and metastasis use mouse skeletons, which don't fully mimic human disease mechanisms.
• This limitation may hinder the successful clinical translation of research findings.

Purpose of the Study:

• To develop and validate a protocol for engineering a humanized bone organ model in vivo.
• To enable the study of human cancer cell interactions within a humanized bone microenvironment.

Main Methods:

• Utilizing additive biomanufactured scaffolds seeded with human bone-forming cells.
• Implanting scaffolds with osteogenic factors into immunodeficient mice to create a partially humanized bone organ.
• Further humanization achieved by engrafting human hematopoietic stem cells (HSCs).

Main Results:

• Successfully generated a physiological bone organ model comprising human bone cells and extracellular matrix (ECM).
• Demonstrated the model's capacity for human hematopoiesis when engrafted with HSCs.
• Validated the model for dissecting mechanisms of bone metastasis in prostate and breast cancer.

Conclusions:

• The engineered humanized bone organ model offers a more relevant in vivo system for studying human bone diseases.
• This model has the potential to improve the clinical translation of research on bone tumors and metastasis.