Abstract
Fracture healing is retarded in the presence of cyclooxygenase-2 (COX-2) inhibitors, demonstrating an important role of COX-2 in trauma-induced woven bone adaptation. The aim of this experiment was to determine the influence of COX-2 inhibition on the remodeling and consolidation of nontraumatic woven bone produced by mechanical loading. A periosteal woven bone callus was initiated in the right tibia of female Wistar rats following a single bout of four-point bending, applied as a haversine wave for 300 cycles at a frequency of 2 Hz and a magnitude of 65 N. Daily injections of vehicle (VEH, polyethylene glycol) or the COX-2 inhibitor 5,5-dimethyl-3-3(3 fluorophenyl)-4-(4-methylsulfonal)phenyl-2(5H)-furanone (DFU, 2.0 mg · kg−1 and 0.02 mg · kg−1 i.p.), commenced 7 days postloading, and tibiae were examined 2, 3, 4, and 5 weeks postloading. Tibiae were dissected, embedded in polymethylmethacrylate, and sectioned for histomorphometric analysis of periosteal woven bone. No significant difference in peak woven bone area was observed between DFU-treated and VEH rats. However, treatment with DFU resulted in a temporal defect in woven bone formation, where the achievement of peak woven bone area was delayed by 1 week. Woven bone remodeling was observed in DFU-treated rats at 21 days postloading, demonstrating that remodeling of the periosteal callus is not prevented in the presence of a COX-2 inhibitor in the rat. We conclude that COX-2 inhibition does not significantly disrupt the mechanism of woven bone remodeling but alters its timing.
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Acknowledgment
We thank Ms. Wendy Kelly for expert histotechnical assistance. This project was supported in part by an Australian Postgraduate Research Award and National Health and Medical Research Council Project grants (ID 142958 and 301143). Merck and Co kindly provided the DFU.
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Gregory, L., Forwood, M. Cyclooxygenase-2 Inhibition Delays the Attainment of Peak Woven Bone Formation following Four-Point Bending in the Rat. Calcif Tissue Int 80, 176–183 (2007). https://doi.org/10.1007/s00223-006-0170-8
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DOI: https://doi.org/10.1007/s00223-006-0170-8