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GelMA/bioactive silica nanocomposite bioinks for stem cell osteogenic differentiation
Márcia T Tavares1,2, Vítor M Gaspar1, Maria V Monteiro1
1CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal.
Biofabrication
|January 18, 2021
Summary
Researchers developed a novel nanocomposite bioink using gelatin methacrylate (GelMA) and functionalized silica nanoparticles to create 3D bone tissue constructs. This bioink promotes stem cell osteogenic differentiation for bone regeneration applications.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Nanotechnology
Background:
- 3D bioprinting offers potential for bone tissue engineering using stem cell-laden biomaterials.
- Existing bioinks often lack the nanosized minerals found in native bone, limiting biomimicry.
- Developing biomimetic scaffolds is crucial for guiding stem cell differentiation.
Purpose of the Study:
- To create multi-bioactive nanocomposite bioinks mimicking bone's organic and inorganic components.
- To enable bottom-up fabrication of 3D constructs for stem cell bioinstruction.
- To develop a bioink that promotes osteogenic differentiation without external stimuli.
Main Methods:
- Formulated a photocrosslinkable bioink combining gelatin methacrylate (GelMA) with mesoporous silica nanoparticles functionalized with calcium, phosphate, and dexamethasone (MSNCaPDex).
- Incorporated human bone marrow-derived mesenchymal stem cells (hBM-MSCs) into the GelMA/MSNCaPDex bioink.
- Processed the nanocomposite bioink into 3D constructs using extrusion bioprinting.
Main Results:
- Successfully fabricated 3D bioprintable constructs with structural fidelity and well-dispersed nanoparticles.
- Demonstrated *in vitro* apatite deposition, indicating bioactivity.
- Confirmed hBM-MSC viability and osteogenic differentiation within the constructs without additional stimuli.
Conclusions:
- The developed GelMA/MSNCaPDex nanocomposite bioink is highly processable for 3D bioprinting.
- The bioink effectively promotes osteogenic differentiation of stem cells, mimicking native bone environments.
- This technology holds significant potential for bone tissue repair and regeneration applications.
