Abstract
In order to investigate cell-based tendon regeneration, a tendon rupture was simulated by utilizing a critical full-size model in female rat achilles tendons. For bridging the defect, polyglycol acid (PGA) and collagen type I scaffolds were used and fixed with a frame suture to ensure postoperatively a functional continuity. Scaffolds were seeded with mesenchymal stem cells (MSC) or tenocytes derived from male animals, while control groups were left without cells. After a healing period of 16 weeks, biomechanical, PCR, histologic, and electron microscopic analyses of the regenerates were performed. Genomic PCR for male-specific gene was used to detect transplanted cells in the regenerates. After 16 weeks, central ossification and tendon-like tissue in the superficial tendon layers were observed in all study groups. Biomechanical test showed that samples loaded with tenocytes had significantly better failure strength/cross-section ratio (P < 0.01) compared to MSC and the control groups whereas maximum failure strength was similar in all groups. Thus, we concluded that the application of tenocytes improves the outcome in this model concerning the grade of ossification and the mechanical properties in comparison to the use of MSC or just scaffold materials.
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Acknowledgments
We thank Prof. Ulrich Welsch for support in electron microscopy. The histologic consultation was kindly performed by the anatomist Prof. Mehdi Shakibaei. The Medical School Research Fund of the Ludwig Maximilians University in Munich (grant: 419-2005) supported this study. Dr. Denitsa Docheva and Prof. Matthias Schieker acknowledge the support of the AO Research Fund of the AO Foundation (grants S-07-18D and S-10-74D). We also thank Martina Burggraf and Krystyna Ern for their technical assistance.
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The authors M.F. Pietschmann and B. Frankewycz contributed evenly to this study.
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Pietschmann, M.F., Frankewycz, B., Schmitz, P. et al. Comparison of tenocytes and mesenchymal stem cells seeded on biodegradable scaffolds in a full-size tendon defect model. J Mater Sci: Mater Med 24, 211–220 (2013). https://doi.org/10.1007/s10856-012-4791-3
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DOI: https://doi.org/10.1007/s10856-012-4791-3