Abstract
Purpose
Our aim was to evaluate whether nonviral vectors can genetically modify primary human juvenile and adult meniscal fibrochondrocytes at low toxicity in vitro and to test the hypothesis that transfected human meniscal fibrochondrocytes transplanted into longitudinal defects and onto human medial meniscus explant cultures are capable of expressing transgene products in vitro.
Methods
Eighteen nonviral gene transfer systems were examined to identify the best suited method for an efficient transfection of primary cultures of juvenile and adult human meniscal fibrochondrocytes using luciferase and lacZ reporter gene constructs and then transplanted to meniscus explant cultures.
Results
Gene transfer systems FuGENE 6, GeneJammer, TurboFectin 8, calcium phosphate co-precipitates and GeneJuice led to minimal toxicity in both cell types. Nanofectin 2 and JetPEI resulted in maximal luciferase activity in both cell types. Maximal transfection efficiency based on X-gal staining following lacZ gene transfer was achieved using Lipofectamine 2000, revealing a mean transfection efficiency of 8.6 % in human juvenile and of 8.4 % in adult meniscal fibrochondrocytes. Transfected, transplanted meniscal fibrochondrocytes adhered to the meniscal tissue and continued to express the transgene for at least five days following transfection.
Conclusions
Nonviral gene transfer systems are safe and capable of transfecting both juvenile and adult human meniscal fibrochondrocytes, which, when transplanted to meniscal tissue in vitro, permit the expression of selected transgenes to be maintained. These results are of value for combining gene therapy and cell transplantation approaches as a means to enhance meniscal repair.
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Acknowledgments
We thank the members of the Department of Orthopaedic Surgery for providing human meniscal tissue.
Conflict of interest
The authors declare that they have no conflict of interest. The authors alone are responsible for the content and writing of the paper.
Authors’ contributions
HPL participated in the design of the study, carried out the transfection and cell viability studies and performed the statistical analysis. GK participated in its design, carried out the transplantation studies and performed the statistical analysis. MC participated in the study design and draft. HM conceived and designed the study, co-ordinated it and drafted the manuscript. All authors read and approved the final manuscript.
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Presented in part at the 55th Annual Meeting of the Orthopaedic Research Society, 2009, Las Vegas, NV, USA
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Lee, HP., Kaul, G., Cucchiarini, M. et al. Nonviral gene transfer to human meniscal cells. Part I: transfection analyses and cell transplantation to meniscus explants. International Orthopaedics (SICOT) 38, 1923–1930 (2014). https://doi.org/10.1007/s00264-014-2410-2
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DOI: https://doi.org/10.1007/s00264-014-2410-2