A 3D vascularized bone remodeling model combining osteoblasts and osteoclasts in a CaP nanoparticle-enriched matrix

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Cell Biology

Background:

• Bone remodeling is a complex process involving coordinated action of bone cells and vascularization.
• Existing in vitro models often lack the complexity to fully replicate in vivo bone remodeling dynamics.

Purpose of the Study:

• To develop a novel 3D vascularized in vitro model that mimics bone remodeling.
• To investigate the synergistic effects of cellular interactions and biomaterials on bone remodeling processes.

Main Methods:

• Human umbilical endothelial cells (HUVECs), bone marrow mesenchymal stem cells (BMSCs), osteoblast (OB) and osteoclast (OC) precursors were encapsulated in collagen/fibrin hydrogels with calcium phosphate nanoparticles (CaPn).
• Assessed vasculogenesis, osteogenesis, osteoclastogenesis, and cell interplay in co-cultures and tetracultures.

Main Results:

• HUVECs formed a robust microvascular network, with BMSCs differentiating into mural cells.
• Reciprocal co-culture of OBs and OCs, along with CaPn, significantly enhanced OB and OC differentiation.
• The combination of tetraculture and CaPn further amplified osteogenic and osteoclastogenic differentiation.

Conclusions:

• A functional 3D vascularized in vitro bone remodeling model was successfully established.
• The model facilitates cellular interactions, enabling cells to perform their specific functions within a biomimetic environment.
• This platform holds potential for studying bone diseases and testing therapeutic interventions.