Abstract
This study examines the clinical relevance of tissue engineering integrating gene therapy and polymer science to bone regeneration. Bilateral maxillary defects (3 × 1.2 cm2) in 20 miniature swine were bridged with a bioresorbable internal splint. Constructs were created using ex vivo adenovirus bone morphogenetic protein (BMP)-2-mediated gene transfer to the expanded bone marrow mesenchymal stem cells (MSCs) 7 days before implantation. Controls were performed using adenovirus β-galactosidase. The BMP-2 cell/construct displayed white solid bone formation after 3 months. Meanwhile, the hematoxylin and eosin and Von Kossa stains demonstrated exhibited mature woven bone with good mineralization. Additionally, three-dimensional computer tomography imaging revealed a nearly complete infraorbital rim repair. Quantitative analysis demonstrated a significant difference (P<0.001) in bone formation. Finally, biomechanical testing revealed no statistically significant difference in the maximal compressive strength of new bone formed by BMP-2 cell constructs and the normal maxilla. The data evidenced de novo bone formation capable of sustaining axial compressive loads. The measurement results showed that ex vivo replication defective adenovirus-mediated human BMP-2 gene transfer to MSCs enhances autologous bone formation in the repair of maxillary defects.
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Acknowledgements
We would like to thank Professor Sing Kai Lo, Institute for International Health, University of Sydney for the statistical work in this manuscript. We wish to thank Dr Lun-Jou Lo and the Medical Imaging Laboratory for providing the CT imaging processing and measurement, and Dr Richard A Robb, PhD, Biomedical Imaging Resource, Mayo Foundation, Rochester, MN, USA, for providing the Analyze program. This research was supported by a Chang Gung Memorial Hospital Grant (CTRP008).
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Chang, SN., Chuang, H., Chen, Y. et al. Ex vivo gene therapy in autologous bone marrow stromal stem cells for tissue-engineered maxillofacial bone regeneration. Gene Ther 10, 2013–2019 (2003). https://doi.org/10.1038/sj.gt.3302106
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DOI: https://doi.org/10.1038/sj.gt.3302106
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