Lacunocanalicular Fluid Flow Transduces Mechanical Tension Stress During Distraction Osteogenesis
| Autor: | P Butala, Stephen M. Warren, Steven M. Sultan, Denis Knobel, Edward H. Davidson |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Male
medicine.medical_treatment education Osteogenesis Distraction Bone Morphogenetic Protein 2 Enzyme-Linked Immunosorbent Assay Mandible Mechanical tension Mechanotransduction Cellular behavioral disciplines and activities Rats Sprague-Dawley Stress (mechanics) Osteogenesis Distraction Fluid dynamics medicine Animals Bone formation Mechanotransduction Orthodontics business.industry General Medicine humanities Rats Otorhinolaryngology Bone Morphogenetic Proteins Distraction osteogenesis Surgery Stress Mechanical business psychological phenomena and processes Signal Transduction |
| Zdroj: | Journal of Craniofacial Surgery. 24:1558-1564 |
| ISSN: | 1049-2275 |
| DOI: | 10.1097/scs.0b013e31828f2060 |
| Popis: | The mechanotransduction mechanisms linking distraction device activation to new bone formation remain unknown. We hypothesize that the tension stress of activation during distraction osteogenesis is transmitted through lacunocanalicular fluid flow to initiate the osteogenic signaling cascade. Adult Sprague-Dawley rats (N = 24) were subjected to mandibular osteotomy and application of an external distraction device. After a 3-day latency period, half the animals (n = 12) underwent device activation at 0.25 mm twice daily for 6 days (total activation, 3 mm), and the other half (n = 12) had no activation. On day 10, the animals were injected with fluorescent reactive red lacunocanalicular tracer before killing. Mandibles were harvested, embedded, and sectioned, and reactive red epifluorescence lacunocanalicular flow was measured. Protein was harvested for focal adhesion kinase 1 (FAK1), NESPRIN1, SUN1, LAMIN A/C, and SMAD1 Western blotting as well as for bone morphogenetic protein (BMP)-2 enzyme-linked immunosorbent assay and alkaline phosphatase assay. Lacunocanalicular fluid flow was significantly greater in the distracted samples (60.5 ± 14 vs 10.3 ± 4 molecules of equivalent soluble fluorochrome per megapixel, P = 0.01). Flow distribution demonstrated the highest lacunocanalicular flow near the center of the distraction gap. Increased lacunocanalicular flow resulted in increased FAK1 (P = 0.009), NESPRIN1 (P = 0.01), SUN1 (P = 0.01), and LAMIN A/C (P = 0.008) expression. Focal adhesion kinase 1 activation in the presence of BMP-2 protein expression (P = 0.001) resulted in increased intranuclear SMAD1 phosphorylation (P = 0.04) and alkaline phosphatase activity (P0.0001). These findings suggest that activation of the distraction osteogenesis device affects cellular response through changes in lacunocanalicular fluid flow. |
| Databáze: | OpenAIRE |
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