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Functionalized Annealed Microgels for Spatial Control of Osteogenic and Chondrogenic Differentiation.
Jeremy M Lowen1,2, Erika E Wheeler1,2, Nathan K Shimamoto1
1Department of Orthopaedic Surgery, UC Davis Health, Sacramento, CA 95817.
Advanced Functional Materials
|August 13, 2025
Summary
Functionalized microgels offer a novel approach to osteochondral tissue repair. These advanced scaffolds promote bone and cartilage regeneration by controlling cell differentiation and extracellular matrix deposition.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Osteochondral defects present a significant clinical challenge due to the complex biophysical properties of the bone-cartilage interface.
- Current multilayer scaffold approaches for osteochondral repair are prone to delamination and require complex fabrication.
- Developing advanced biomaterials is crucial for effectively repairing heterogeneous osteochondral tissues.
Purpose of the Study:
- To develop functionalized microgels for osteochondral tissue repair.
- To investigate the potential of microgel-based scaffolds in promoting osteogenic and chondrogenic differentiation of mesenchymal stromal cells (MSCs).
- To assess the ability of bilayer microgel scaffolds to spatially control cell differentiation.
Main Methods:
- Fabrication of functionalized microgels incorporating N-cadherin peptide, BMP-2 peptide, and varying stiffness.
- Annealing microgels into macroporous scaffolds and evaluating MSC response.
- Creation of bilayer functionalized annealed microgel scaffolds for spatial differentiation studies.
- Analysis of gene and protein expression using immunostaining and spatial transcriptomics.
Main Results:
- Microgel-annealed scaffolds demonstrated superior performance over bulk hydrogels, indicated by upregulated osteogenic and chondrogenic markers in MSCs.
- Macroporous void space in microgel scaffolds facilitated robust cell proliferation and extracellular matrix deposition.
- Bilayer microgel scaffolds successfully achieved spatial control of MSC differentiation, with distinct osteogenic and chondrogenic protein and gene expression in respective regions.
Conclusions:
- Functionalized microgels represent a tunable and effective platform for osteochondral tissue engineering.
- The macroporous architecture of microgel-annealed scaffolds is critical for cell infiltration and tissue formation.
- Bilayer microgel scaffolds offer precise spatial control over cell differentiation, paving the way for advanced regenerative therapies.
