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Published on: May 21, 2013
Cartilage tissue engineering by collagen matrix associated bone marrow derived mesenchymal stem cells.
R M Schulz1, M Zscharnack, I Hanisch
1Department of Cell Techniques and Applied Stem Cell Biology, Center of Biotechnology and Biomedicine, University of Leipzig, Leipzig, Germany. ronny.schulz@bbz.uni-leipzig.de
Bio-Medical Materials and Engineering
|May 6, 2008
Summary
This study shows that mesenchymal stem cells (MSCs) in collagen hydrogels can form hyaline-like cartilage in vitro. These MSC-seeded grafts show promising potential for repairing focal cartilage defects.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Cell Biology
Background:
- Cartilaginous graft formation is crucial for repairing articular cartilage defects.
- Articular chondrocytes (AC) and mesenchymal stem cells (MSCs) are potential cell sources for cartilage regeneration.
- Developing effective in vitro methods for generating functional cartilaginous tissue is essential.
Purpose of the Study:
- To compare the in vitro formation of cartilaginous grafts using ovine primary articular chondrocytes (AC) and bone marrow-derived mesenchymal stem cells (MSCs) in a collagen type I hydrogel.
- To evaluate cell viability, matrix deposition, and expression of cartilage-specific markers in engineered grafts.
- To assess the potential of MSC-seeded grafts for cartilage repair applications.
Main Methods:
- Ovine primary articular chondrocytes (AC) and bone marrow-derived mesenchymal stem cells (MSCs) were cultured in collagen type I hydrogels for 4 weeks.
- Quantitative analysis of aggregate properties, cell viability assays, and expression of cartilage markers were performed.
- Microscopic techniques, immunohistochemical staining, and semi-quantitative RT-PCR were employed to assess cell distribution, differentiation, and matrix production.
Main Results:
- MSC-seeded scaffolds exhibited a distinct cellular organization with proliferative cells in peripheral layers and differentiated cells centrally.
- Significant deposition of sulfated glycosaminoglycans (s-GAG) was observed in MSC hydrogels, primarily in outer regions.
- RT-PCR analysis revealed sustained collagen type I expression with increased collagen type II, aggrecan, and Sox9 expression in MSCs, indicating hyaline-like cartilage formation.
Conclusions:
- Mesenchymal stem cells (MSCs) seeded in collagen type I hydrogels can successfully form in vitro cartilaginous grafts with hyaline-like characteristics.
- MSC-based grafts demonstrate potential for enhanced matrix deposition and expression of key cartilage markers.
- These findings support the application of MSC-seeded grafts for the effective repair of focal cartilage lesions.
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