Abstract
This study aimed to investigate the effects of recombinant human bone morphogenetic protein (rhBMP-7) on human cancellous bone grafts (BGs) while differentiating between anabolic and catabolic events. Human BGs alone or supplemented with rhBMP-7 were harvested 14 weeks after subcutaneous implantation into NOD/Scid mice, and studied via micro-CT, histomorphometry, immunohistochemistry and flow cytometry. Immunohistochemical staining for human-specific proteins made it possible to differentiate between grafted human bone and newly formed murine bone. Only BGs implanted with rhBMP-7 formed an ossicle containing a functional hematopoietic compartment. The total ossicle volume in the BMP+ group was higher than in the BMP− group (835 mm3 vs. 365 mm3, respectively, p < 0.001). The BMP+ group showed larger BM spaces (0.47 mm vs. 0.28 mm, p = 0.002) and lower bone volume-to-total volume ratio (31% vs. 47%, p = 0.002). Immunohistochemical staining for human-specific proteins confirmed a higher ratio of newly formed bone area (murine) to total area (0.12 vs. 0.001, p < 0.001) in the BMP+ group, while the ratio of grafted bone (human) area to total area was smaller (0.14 vs. 0.34, p = 0.004). The results demonstrate that rhBMP-7 induces BG resorption at a higher rate than new bone formation while creating a haematopoietic niche. Clinicians therefore need to consider the net catabolic effect when rhBMP-7 is used with BGs. Overall, this model indicates its promising application to further decipher BMPs action on BGs and its potential in complex bone tissue regeneration.
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Acknowledgements
Baxter Healthcare Australia kindly provided Fibrin Glue (TISSEEL Fibrin Sealant). The following funding existed during conduction of this study: National Health and Medical Research Council of Australia (Project Grant 1082313 to BMH and DWH), German Research Foundation (DFG HO 5068/1-1 to BMH) and Australian Research Council (IC160100026).
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Christoph A. Lahr, Ferdinand Wagner, Abbas Shafiee, Maximilian Rudert, Dietmar W. Hutmacher and Boris Michael Holzapfel declare that there is no conflict of interest.
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This study was approved by the University Animal Ethics Committee (Approval No. 130/025). All animal experiments were executed in conformity with the national animal care guidelines.
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Lahr, C.A., Wagner, F., Shafiee, A. et al. Recombinant Human Bone Morphogenetic Protein 7 Exerts Osteo-Catabolic Effects on Bone Grafts That Outweigh Its Osteo-Anabolic Capacity. Calcif Tissue Int 105, 331–340 (2019). https://doi.org/10.1007/s00223-019-00574-5
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DOI: https://doi.org/10.1007/s00223-019-00574-5