Abstract
Purpose
Achilles tendon ruptures are devastating and recover slowly and incompletely. There is a great demand for biomolecular therapies to improve recovery, yet little is understood about growth factors in a healing tendon. Here, the role of growth factors during tendon healing in a rat model and their reaction to single and multiple growth factor treatment are explored.
Methods
Rat tendons were transected surgically and resutured. The expression of bFGF, BMP-12, VEGF and TGF-β1 was assessed by immunohistochemical analysis one to 8 weeks after surgery. Paracrine effects of TGF-β1 or BMP-12 added by adenoviral transfer, as well as the effect of autologous conditioned serum (ACS) on growth factor expression, were evaluated.
Results
bFGF, BMP-12 and VEGF expression was highest 1 week after transection. bFGF and BMP-12 declined during the remaining period whereas VEGF expression persisted. TGF-β1 expression dramatically increased after 8 weeks. ACS treatment increased bFGF (P = 0.007) and BMP-12 (P = 0.004) expression significantly after 8 weeks. Also overall expression of bFGF, BMP-12 and TGF-β1 regardless of time point was significantly greater than controls with ACS treatment (P < 0.05). Both BMP-12 and TGF-β1 treatments had no significant effect. No effect was observed in VEGF with any treatment.
Conclusion
bFGF, BMP-12, VEGF and TGF-β1 are differentially expressed during tendon healing. Additional BMP-12 or TGF-β1 has no significant influence, whereas ACS generally increases expression of all factors except VEGF. Staged application of multiple growth factors may be the most promising biomolecular treatment.
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Abbreviations
- ACS:
-
Autologous conditioned serum
- bFGF:
-
Basic fibroblast growth factor, a.k.a. FGF-2
- BMP:
-
Bone morphogenic protein
- CDMP:
-
Cartilage-derived morphogenic protein
- GDF:
-
Growth and differentiation factor
- IGF-1:
-
Insulin-like growth factor 1
- PDGF:
-
Platelet-derived growth factor
- TGF-β1:
-
Transforming growth factor beta 1
- VEGF:
-
Vascular endothelial growth factor
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Patricia E. Heisterbach and Atanas Todorov are equally contributing first authors.
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Heisterbach, P.E., Todorov, A., Flückiger, R. et al. Effect of BMP-12, TGF-β1 and autologous conditioned serum on growth factor expression in Achilles tendon healing. Knee Surg Sports Traumatol Arthrosc 20, 1907–1914 (2012). https://doi.org/10.1007/s00167-011-1772-x
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DOI: https://doi.org/10.1007/s00167-011-1772-x
Keywords
- Growth factors
- Tendon healing
- Biological repair
- Animal model