Abstract
Xenogeneic or allogeneic chondrocytes hold great potential to build up new cartilage in vivo. However, immune rejection is a major concern for the utility of universal donor-derived cells. In order to verify the reported immune privilege of chondrocytes in vivo, the aim of this study was to assess engraftment of human articular chondrocytes (HAC) in minipig knee cartilage defects and their contribution to cartilage regeneration. HAC were transplanted matrix-assisted within two hydrogels into full-thickness cartilage defects of minipigs or implanted ectopically into immune deficient mice to assess redifferentiation capacity. At 2 and 4 weeks after surgery, cell-persistence and host cell invasion were monitored by species-specific in situ hybridization and RT-PCR. Early tissue regeneration was evaluated by histomorphometry and a modified O’Driscoll score. HAC capable of successful in vivo chondrogenic redifferentiation persisted at ectopic sites for 4 weeks in both carrier materials. Early defect regeneration involved extensive host cell invasion and a decline of HAC to less than 5 % of initial cell numbers in 6/12 defects within 2 weeks. Few clusters of persisting HAC within collagen type II-rich tissue were surrounded by porcine macrophages. Four weeks after cell transplantation, most of the defects contained well-integrated cell-rich tissue free of human cells with no apparent difference between hydrogel carriers. In summary, HAC failed to engraft in porcine articular cartilage defects despite their ability for successful in vivo redifferentiation. The co-localization of macrophages to hydrogel-implanted HAC suggests active graft rejection without evidence for an immune-privileged status of xenogeneic chondrocytes in a large animal joint.
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Acknowledgments
The study was funded by the Federal Ministry of Education and Research (BMBF grants 0315577H and 0315579) as well as a grant from TETEC AG, Reutlingen, Germany. We thank Jürgen Mollenhauer for providing porcine albumin for Novocart® Inject preparation. We gratefully acknowledge Elisabeth Seebach, Martin Rütze and Jan Brocher for help and advice and Nicole Buchta and Birgit Frey for excellent technical assistance.
Disclosure of conflicts
W. Richter received financial support for conducting this study from TETEC AG, Reutlingen, Germany. TETEC AG had no influence on data analysis and the manuscript writing of this work.
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Supplementary Fig. 1
Species-specific genomic in situ hybridization. Expanded HAC embedded in fibrin were cultured under chondrogenic conditions for 14 days to obtain a stable construct with cartilaginous matrix deposition. Then, the sample was coated by a layer of expanded porcine mesenchymal stromal cells embedded in fibrin and cultured for further 5 days. Serial sections of the composites were subjected to species-specific in situ hybridization for simultaneous detection of a human cells (ALU DNA repeats) and b porcine cells (pSINE hybridization). A dark signal indicates positive cell nuclei. The letters mark areas with human (h) or porcine (p) cell layers. No cross-hybridization to cells of the other species was evident (GIF 144 kb)
Supplementary Fig. 1
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Niemietz, T., Zass, G., Hagmann, S. et al. Xenogeneic transplantation of articular chondrocytes into full-thickness articular cartilage defects in minipigs: fate of cells and the role of macrophages. Cell Tissue Res 358, 749–761 (2014). https://doi.org/10.1007/s00441-014-1982-x
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DOI: https://doi.org/10.1007/s00441-014-1982-x