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3D Hydrogel Scaffolds for Articular Chondrocyte Culture and Cartilage Generation
Published on: October 7, 2015
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Modulating stem cell-chondrocyte interactions for cartilage repair using combinatorial extracellular
Tianyi Wang1, Janice H Lai, Li-Hsin Han
1Department of Bioengineering, Stanford University, 300 Pasteur Dr., Edwards R105, Stanford, CA 94305-5341, USA.
Journal of Materials Chemistry. B
|April 9, 2020
Summary
Extracellular matrix cues, not stiffness, dominate cartilage formation in co-cultures of adipose-derived stem cells (ADSCs) and neonatal chondrocytes (NChons). Chondroitin sulfate and hyaluronic acid promote articular cartilage matrix deposition, guiding scaffold design for enhanced cartilage repair.
Area of Science:
- Biomaterials Science
- Stem Cell Biology
- Tissue Engineering
Background:
- Stem cells (SCs) facilitate cartilage repair via chondrogenesis or paracrine signaling.
- Adipose-derived stem cells (ADSCs) have shown potential in catalyzing cartilage formation with neonatal chondrocytes (NChons) in hydrogel co-cultures.
- The influence of matrix cues on this SC-mediated cartilage formation is not well understood.
Purpose of the Study:
- To investigate how biochemical and mechanical properties of biomimetic hydrogels influence SC-catalyzed cartilage formation.
- To determine the dominant role of extracellular matrix (ECM) molecules versus hydrogel stiffness in modulating cartilage matrix deposition.
Main Methods:
- Co-encapsulation of ADSCs and NChons in 39 combinatorial hydrogel compositions.
- Incorporation of methacrylated ECM molecules (chondroitin sulfate, hyaluronic acid, heparan sulfate) at varying concentrations (0.5-5%).
- Decoupling of hydrogel stiffness (15, 40, 100 kPa) from biochemical properties; analysis via biochemical assays and histology.
Main Results:
- The type of ECM cue significantly modulated cartilage formation, more so than hydrogel stiffness or ECM concentration.
- Chondroitin sulfate and hyaluronic acid promoted robust deposition of aggrecan and type II collagen, indicative of articular cartilage.
- Heparan sulfate led to type I collagen deposition (fibrocartilage phenotype) and reduced cell proliferation and ECM deposition.
Conclusions:
- ECM composition, particularly chondroitin sulfate and hyaluronic acid, is a critical factor in guiding SC-catalyzed cartilage formation.
- Hydrogel stiffness has a less pronounced effect compared to ECM type.
- These findings provide a basis for designing optimized scaffolds to enhance synergistic cartilage formation for regenerative medicine applications.
