3D Osteoimmune Stem Cell Spheroids with Osteoinduction and Immunomodulation Dual Functionality for In Vivo Bone...

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Effective bone regeneration necessitates both osteoinduction and immunomodulation.
• Current strategies often struggle to balance these complex healing processes.

Purpose of the Study:

• To engineer multifunctional 3D stem cell spheroids (Sphe-BP-IL4-BMP2) for enhanced bone regeneration.
• To investigate the synergistic effects of black phosphorus (BP), interleukin-4 (IL-4), and bone morphogenetic protein-2 (rhBMP-2) in a 3D platform.

Main Methods:

• Integration of black phosphorus (BP) nanosheets coloaded with IL-4 and rhBMP-2 into stem cell spheroids.
• In vitro assessment of osteogenic markers, ALP activity, and macrophage polarization.
• In vivo evaluation in a rat calvarial defect model.

Main Results:

• Sphe-BP-IL4-BMP2 spheroids demonstrated enhanced cell viability and uniform BP distribution.
• In vitro studies showed upregulated osteogenic markers and potent immunomodulatory effects on macrophages.
• In vivo implantation accelerated bone regeneration and increased angiogenesis without adverse effects.

Conclusions:

• The engineered 3D spheroid platform effectively combines osteoinductive and immunomodulatory cues.
• This synergistic approach offers a promising strategy for treating critical-sized bone defects.
• The study highlights the potential of multifunctional biomaterials in regenerative medicine.