Journal
BONE
Volume 110, Issue -, Pages 150-159Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.bone.2018.02.001
Keywords
Cyclooxygenase-2 (COX-2); Fracture healing; Parathyroid hormone (PTH); Periosteum; Prostaglandin
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Funding
- NIH [R01 AR048681, P50 AR054041, P30 AR061307]
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Genetic ablation of cyclooxygenase-2 (COX-2) in mice is known to impair fracture healing. To determine if teriparatide (human PTH1-34) can promote healing of Cox-2-deficient fractures, we performed detailed in vivo analyses using a murine stabilized tibia fracture model. Periosteal progenitor cell proliferation as well as bony callus formation was markedly reduced in Cox-2(-/-) mice at day 10 post-fracture. Remarkably, intermittent PTH1-34 administration increased proliferation of periosteal progenitor cells, restored callus formation on day 7, and enhanced bone formation on days 10,14 and 21 in Cox-2-deficient mice. PTH1-34 also increased biomechanical torsional properties at days 10 or 14 in all genotypes, consistent with enhanced bony callus formation by radiologic examinations. To determine the effects of intermittent PTH1-34 for callus remodeling, TRAP staining was performed. Intermittent PTH1-34 treatment increased the number of TRAP positive cells per total callus area on day 21 in Cox-2(-/-) fractures. Taken together, the present findings indicate that intermittent PTH1-34 treatment could compensate for COX-2 deficiency and improve impaired fracture healing in Cox-2-deficient mice. (C) 2018 Elsevier Inc. All rights reserved.
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