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TGF-β1/BSA coating modulates multi-phasic scaffolds for osteochondral tissue regeneration.
Farnaz Ghorbani1,2,3, Behafarid Ghalandari4, Rainer Detsch1
1Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstrasse 6, 91058, Erlangen, Germany.
Materials Today. Bio
|June 12, 2025
Summary
This study developed protein-modified scaffolds to regenerate bone and cartilage defects. The novel multi-phasic scaffolds show promise for enhanced osteochondral defect repair.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Osteochondral defects pose a significant clinical challenge due to difficulties in regenerating both cartilage and bone.
- Existing bioinspired scaffolds struggle with integrating newly formed bone and cartilage, limiting clinical translation.
- Developing advanced constructs that mimic anatomical architecture is crucial for effective osteochondral regeneration.
Purpose of the Study:
- To engineer a protein-modified, stratified, multi-phasic scaffold for osteochondral defect regeneration.
- To investigate the physicochemical properties and biological performance of the developed scaffold.
- To evaluate the scaffold's potential for promoting both osteogenic and chondrogenic differentiation.
Main Methods:
- Fabrication of a multi-phasic scaffold with a 3D printed poly(lactic-co-glycolic acid) (PLGA) bottom layer and an electrospun PLGA-gelatine top layer.
- Modification of scaffolds with simvastatin and coating with transforming growth factor-β1 (TGF-β1)-bovine serum albumin (BSA) complex.
- In vitro characterization including porosity, hydrophilicity, degradation, mineralization, and cell culture studies with mesenchymal stem cells, chondrocytes, and osteoblasts.
Main Results:
- The multi-phasic scaffolds exhibited a hierarchical porous structure, hydrophilicity, and controlled degradation rates.
- Scaffolds supported adhesion, proliferation, alkaline phosphatase secretion, and biomineralization of bone marrow mesenchymal stem cells.
- Enhanced expression of chondrogenic (COL2A1, SOX9) and osteogenic (SPP1, COL1A1) biomarkers was observed in respective cell cultures.
Conclusions:
- The developed hierarchical multi-phasic scaffolds demonstrate excellent cytocompatibility and promote both osteogenic and chondrogenic differentiation.
- The synergistic effect of the TGF-β1/BSA complex enhances growth factor bioavailability, improving scaffold performance.
- These protein-modified scaffolds represent a highly promising strategy for the regeneration of osteochondral defects.
