Abstract
The objective of this study was to investigate the effects of human parathyroid hormone (1–34) (PTH1–34; PTH) plus menaquinone-4 (vitamin K2; MK) on the osseous integration of hydroxyapatite (HA)-coated implants in osteoporotic rats. Ovariectomized female Sprague–Dawley rats were used for the study. Twelve weeks after bilateral ovariectomy, HA-coated titanium implants were inserted bilaterally in the femoral medullary canal of the remaining 40 ovariectomized rats. All animals were then randomly assigned to four groups: Control, MK, PTH and PTH + MK. The rats from groups MK, PTH and PTH + MK received vitamin K2 (30 mg/kg/day), PTH1–34 (60 μg/kg, three times a week), or both for 12 weeks. Thereafter, serum levels of γ-carboxylated osteocalcin (Gla-OC) were quantitated by ELISA and the bilateral femurs of rats were harvested for evaluation. The combination of PTH and MK clearly increased the serum levels of Gla-OC (a specific marker for bone formation) compared to PTH or MK alone. The results of our study indicated that all treated groups had increased new bone formation around the surface of implants and increased push-out force compared to Control. In addition, PTH + MK treatment showed the strongest effects in histological, micro-computed tomography and biomechanical tests. In summary, our results confirm that treatment with PTH1–34 and MK together may have a therapeutic advantage over PTH or MK monotherapy on bone healing around HA-coated implants in osteoporotic rats.
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This work was funded by a research grant to Natural Science Foundation of Zhejiang Province (Grant No.: LY16H250002).
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Statement of ethical approval: Animals were handled with the approval of the Animal Experimentation Ethics Committee of Second Affiliated Hospital of Wenzhou Medical University.
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Li, H., Zhou, Q., Bai, BL. et al. Effects of combined human parathyroid hormone (1–34) and menaquinone-4 treatment on the interface of hydroxyapatite-coated titanium implants in the femur of osteoporotic rats. J Bone Miner Metab 36, 691–699 (2018). https://doi.org/10.1007/s00774-017-0893-9
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DOI: https://doi.org/10.1007/s00774-017-0893-9