Related Experiment Videos
Tissue-engineered osteochondral constructs in the shape of an articular condyle
1Department of Anatomy, Tissue Engineering Laboratory, MC 841, University of Illinois at Chicago, 801 South Paulina Street, Chicago, Illinois 60612, USA.
Summary
Tissue engineering of articular condyles using mesenchymal stem cells shows promise as an alternative to joint replacement. Optimized cell density and in vivo incubation promote cartilage and bone tissue maturation.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Tissue Engineering
Background:
- Mesenchymal stem cells (MSCs) offer potential for engineered articular condyles, an alternative to total joint replacement.
- Optimizing chondrogenic and osteogenic differentiation of MSCs is crucial for successful articular condyle engineering in vivo.
Purpose of the Study:
- To optimize the differentiation of mesenchymal stem cells into chondrogenic and osteogenic lineages for engineering articular condyles.
- To evaluate the in vivo development of engineered articular condyles using a hydrogel-based scaffold.
Main Methods:
- Primary rat bone-marrow MSCs were induced for chondrogenic and osteogenic differentiation in vitro.
- Cells were suspended in a polyethylene glycol-based hydrogel at 20 x 10^6 cells/mL, layered, and photopolymerized into a human mandibular condyle shape.
- Constructs were implanted subcutaneously in immunodeficient mice for 12 weeks.
Main Results:
- Engineered articular condyles formed de novo, matching human mandibular condyle dimensions after 12 weeks.
- Histology revealed stratified cartilaginous and osseous layers with interpenetration, positive for type-II collagen and hypertrophic chondrocyte markers (type-X collagen).
- The osseous portion showed bone trabeculae expressing type-I collagen, osteopontin, and osteonectin.
Conclusions:
- A cell density of 20 million cells/mL with 12 weeks of in vivo incubation promotes tissue maturation.
- This approach yields significant phenotypic growth of both cartilage-like and bone-like tissues in engineered articular condyles.