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Acceleration of articular cartilage repair by combined gene transfer of human insulin-like growth factor I and fibroblast growth factor-2 in vivo

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Archives of Orthopaedic and Trauma Surgery Aims and scope Submit manuscript

Abstract

Introduction

Improving the biochemical and structural qualities of the new tissue that fills deep osteochondral defects is critical to enhance articular cartilage repair. We developed a novel molecular therapy to increase articular cartilage repair based on a combined strategy to stimulate chondrogenesis by co-transfection of the human insulin-like growth factor I (IGF-I) and fibroblast growth factor 2 (FGF-2) in a xenogenic transplantation model.

Materials and methods

NIH 3T3 cells were transfected with expression plasmid vectors containing a cDNA for the E. coli lacZ gene (lacZ implants), the human IGF-I gene (IGF-I implants) or both the human IGF-I and FGF-2 genes (IGF-I/FGF-2 implants). The expression patterns of the transgenes were monitored in vitro for 21 days. LacZ, IGF-I and IGF-I/FGF-2 implants were transplanted into osteochondral defects in the trochlear groove of rabbits. At 3 weeks, the quality of articular cartilage repair was evaluated qualitatively and quantitatively.

Results

Both IGF-I and IGF-I/FGF-2 implants secreted increased levels of the corresponding recombinant proteins in vitro. In vivo, transplantation of the co-transfected IGF-I/FGF-2 implants increased the DNA content of the repair tissue, accelerated the formation of the subchondral bone and improved articular cartilage repair in a magnitude that was larger than with IGF-I alone or when compared to lacZ implants.

Conclusion

These results suggest that gene delivery of a combination of IGF-I and FGF-2 to cartilage defects may be more beneficial than application of IGF-I alone.

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Acknowledgments

We thank E. Kabiljagic for the expert technical assistance. This study was supported by the Deutsche Forschungsgemeinschaft (DFG MA 2363/1-2 to HM). All performed experiments complied with the current laws of Germany.

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Correspondence to Henning Madry.

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Madry, H., Orth, P., Kaul, G. et al. Acceleration of articular cartilage repair by combined gene transfer of human insulin-like growth factor I and fibroblast growth factor-2 in vivo. Arch Orthop Trauma Surg 130, 1311–1322 (2010). https://doi.org/10.1007/s00402-010-1130-3

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