Human chondrocytes differentially express matrix modulators during in vitro expansion for tissue engineering
Cartilage tissue engineering plays an important role in the generation of grafts for reconstructive surgery. In cultured chondrocytes, the dedifferentiation of cells seems unavoidable for multiplication. Dedifferentiated cells produce matrix of less quality, and the molecular basis is still not well...
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| Main Authors: | , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
October 1, 2005
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| In: |
International journal of molecular medicine
Year: 2005, Volume: 16, Issue: 4, Pages: 509-515 |
| ISSN: | 1791-244X |
| DOI: | 10.3892/ijmm.16.4.509 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://www.spandidos-publications.com/10.3892/ijmm.16.4.509 Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3892/ijmm.16.4.509 
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| Author Notes: | Ulrich Reinhart Goessler, Karen Bieback, Peter Bugert, Ramin Naim, Carsten Schafer, Haneen Sadick, Karl Hormann, Frank Riedel |
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| 520 | |a Cartilage tissue engineering plays an important role in the generation of grafts for reconstructive surgery. In cultured chondrocytes, the dedifferentiation of cells seems unavoidable for multiplication. Dedifferentiated cells produce matrix of less quality, and the molecular basis is still not well understood. Therefore, the aim of our study was to investigate the expression of matrix modulators in human chondrocytes during expansion. Human chondrocytes were isolated from septal cartilage (n=32) and held in primary cell culture. Cells were harvested after 1, 6 and 21 days. The differentiation of cells using light microscopy, the expression patterns of various proteins (MMPs, BMPs, and TIMPs) using immunohistochemistry, and the expression of distinct genes using microarray technique, were investigated. The chondrocytes showed strong in vitro proliferation. After 6 and 21 days, BMP-5 and -8 were up-regulated, BMP-2 was down-regulated and BMP-6 was inactivated. Other BMPs were not expressed. The expression of MMP-2, -3 and -13 was up-regulated from day 1 to 21, and MMP-12 and -20 were down-regulated. Other MMPs were not expressed. TIMP-1 was up-regulated and TIMP-3 was down-regulated during expansion. Differential expression of matrix modulators might influence the matrix composition of engineered cartilage. Improving the basic knowledge in this area may ultimately help clinicians to identify and proactively intervene in an attempt to prevent bioartificial cartilage from losing stability. | ||
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