Abstract
Bone has the natural ability to remodel and repair. Fractures and small noncritical size bone defects undergo regenerative healing via coordinated concurrent development of skeletal and vascular elements in a soft cartilage callus environment. Within this environment bone regeneration recapitulates many of the same cellular and molecular mechanisms that form embryonic bone. Angiogenesis is intimately involved with embryonic bone formation and with both endochondral and intramembranous bone formation in differentiated bone. During bone regeneration osteogenic cells are first associated with vascular tissue in the adjacent periosteal space or the adjacent injured marrow cavity that houses endosteal blood vessels. Critical size bone defects cannot heal without the assistance of therapeutic aids or materials designed to encourage bone regeneration. We discuss the prospects for using synthetic hydrogels in a bioengineering approach to repair critical size bone defects. Hydrogel scaffolds can be designed and fabricated to potentially trigger the same bone morphogenetic cascade that heals bone fractures and noncritical size defects naturally. Lastly, we introduce adult Xenopus laevis hind limb as a novel small animal model system for bone regeneration research. Xenopus hind limbs have been used successfully to screen promising scaffolds designed to heal critical size bone defects.
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Abbreviations
- BMPs:
-
Bone morphogenetic proteins
- Cbfa1:
-
Core binding factor 1
- CDMP-1:
-
Cartilage-derived morphogenetic protein-1
- CSD:
-
Critical size defect
- CXCR-4:
-
Receptor for SDF-1
- ECM:
-
Extracellular matrix
- FDA:
-
Food and Drug Administration
- FGFs:
-
Fibroblast growth factors
- GDF-5:
-
Growth/differentiation factor 5
- GF-11:
-
Skeletal growth factor
- HA:
-
Hydroxyapatite
- HDDA:
-
1,6 Hexanediol diacrylate
- HIFα:
-
Hypoxia-induced factor alpha
- IGF:
-
Insulin-like growth factor
- IHH:
-
Indian hedgehog
- IL:
-
Interleukin
- M-CSF:
-
Macrophage colony stimulating factor
- MMP:
-
Metalloproteinase
- MRI:
-
Magnetic resonance imaging
- MSCs:
-
Mesenchymal stem cells
- OPG:
-
Osteoprotegerin
- PDGF:
-
Platelet-derived growth factor
- PTHrP:
-
Parathyroid hormone related peptide
- RANKL:
-
Receptor activator of nuclear factor kappa-B ligand
- SDF-1:
-
Stromal cell-derived factor-1
- SHH:
-
Sonic hedgehog
- TCP:
-
Tricalcium phosphate
- TGFβ:
-
Transforming growth factor beta
- TNF-α:
-
Tumor necrosis factor-alpha
- VEGF:
-
Vascular endothelial growth factor
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Cameron, J.A., Milner, D.J., Lee, J.S., Cheng, J., Fang, N.X., Jasiuk, I.M. (2012). Employing the Biology of Successful Fracture Repair to Heal Critical Size Bone Defects. In: Heber-Katz, E., Stocum, D. (eds) New Perspectives in Regeneration. Current Topics in Microbiology and Immunology, vol 367. Springer, Berlin, Heidelberg. https://doi.org/10.1007/82_2012_291
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