Abstract
Vascularized bone transplantation enables reconstruction of large skeletal defects, but this process needs a long time. Since short-term intermittent parathyroid hormone (PTH) enhances rat fracture healing, we investigated the effects of 4-week intermittent low-dose (10 μg/kg/day) or high-dose (100 μg/kg/day) PTH followed by 4-week vehicle, low-dose or high-dose intermittent PTH, or zoledronic acid (ZOL, 2 μg/kg/week), a potent bisphosphonate, on large skeletal reconstruction by vascularized tibial grafting in rats. Compared to 8-week vehicle, 8-week low-dose PTH did not significantly increase the serum osteocalcin level as well as the urinary deoxypyridinoline level, while 4-week low-dose or high-dose PTH followed by 4-week ZOL decreased both of these levels. Eight-week PTH increased the bone mass of the graft and strength of the reconstructed skeleton in a dose-dependent manner; notably, the reconstructed skeleton showed an obviously higher response to PTH compared to the contralateral nonoperated femur. In contrast, 4-week PTH followed by 4-week vehicle reduced these effects and caused local bone loss at the host-graft junctions. Four-week PTH followed by 4-week ZOL did not induce such bone loss; however, 4-week high-dose PTH followed by 4-week ZOL caused a large callus in the distal cortical junction. Four-week PTH followed by 4-week ZOL increased the bone mass and strength similarly to 8-week PTH. These preliminary findings suggest, for the first time, that sequential treatment with short-term intermittent low-dose PTH and bisphosphonate as well as long-term intermittent low-dose PTH treatment enhance large skeletal reconstruction by vascularized bone transplantation, though early timing of sequential antiresorptive treatment could result in delay of bone repair.
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Acknowledgments
We thank Shinya Kawai (Yamaguchi University School of Medicine) for support of this project. This study was partly supported by a grant from Novartis Pharma K.K. (Kabushiki Kaisya) (Japan, Tokyo). T. S. is the recipient of a research fellowship from the Uehara Memorial Foundation.
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Hashimoto, T., Shigetomi, M., Ohno, T. et al. Sequential Treatment with Intermittent Low-Dose Human Parathyroid Hormone (1-34) and Bisphosphonate Enhances Large-Size Skeletal Reconstruction by Vascularized Bone Transplantation. Calcif Tissue Int 81, 232–239 (2007). https://doi.org/10.1007/s00223-007-9056-7
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DOI: https://doi.org/10.1007/s00223-007-9056-7