Effects of the combination of vitamin K and teriparatide on the bone metabolism in ovariectomized rats

  • Authors:
    • Nana Nagura
    • Jun Komatsu
    • Hideaki Iwase
    • Hiroshi Hosoda
    • Osamu Ohbayashi
    • Isao Nagaoka
    • Kazuo Kaneko
  • View Affiliations

  • Published online on: February 18, 2015     https://doi.org/10.3892/br.2015.431
  • Pages: 295-300
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Abstract

The purpose of the present study was to evaluate the combined effects of vitamin K (VK) and teriparatide (TPTD) on bone mineral density (BMD), mechanical strength and other parameters for bone metabolism using a rat ovariectomized osteoporosis model. Ovariectomized female Sprague‑Dawley rats were administered with VK (an oral dose of 30 mg/kg/day), TPTD (a subcutaneous dose of 30 µg/kg, three times a week) or a combination for 8 weeks. Thereafter, serum levels of γ‑carboxylated osteocalcin (Gla‑OC) were quantitated by ELISA; BMD and mechanical strength were measured by computed tomography and biomechanical testing, respectively at the femoral metaphysis. Additionally, histomorphometry was performed using the toluidine blue‑stained coronal sections of distal femur. The combination of VK and TPTD clearly increased the serum levels of Gla‑OC (a specific marker for bone formation) and osteoblast surface (the number of osteoblasts attaching with the surface of cancellous bone), compared to VK or TPTD alone. In addition, the combination of the two agents improved the BMD and bone strength of the femur in the ovariectomized rats, compared to VK or TPTD alone. Taken together, these findings suggest that the treatment with VK and TPTD may have a therapeutic advantage over VK or TPTD monotherapy for postmenopausal osteoporosis, possibly by enhancing the bone formation through the actions on OC and osteoblasts.
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May-2015
Volume 3 Issue 3

Print ISSN: 2049-9434
Online ISSN:2049-9442

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Spandidos Publications style
Nagura N, Komatsu J, Iwase H, Hosoda H, Ohbayashi O, Nagaoka I and Kaneko K: Effects of the combination of vitamin K and teriparatide on the bone metabolism in ovariectomized rats. Biomed Rep 3: 295-300, 2015.
APA
Nagura, N., Komatsu, J., Iwase, H., Hosoda, H., Ohbayashi, O., Nagaoka, I., & Kaneko, K. (2015). Effects of the combination of vitamin K and teriparatide on the bone metabolism in ovariectomized rats. Biomedical Reports, 3, 295-300. https://doi.org/10.3892/br.2015.431
MLA
Nagura, N., Komatsu, J., Iwase, H., Hosoda, H., Ohbayashi, O., Nagaoka, I., Kaneko, K."Effects of the combination of vitamin K and teriparatide on the bone metabolism in ovariectomized rats". Biomedical Reports 3.3 (2015): 295-300.
Chicago
Nagura, N., Komatsu, J., Iwase, H., Hosoda, H., Ohbayashi, O., Nagaoka, I., Kaneko, K."Effects of the combination of vitamin K and teriparatide on the bone metabolism in ovariectomized rats". Biomedical Reports 3, no. 3 (2015): 295-300. https://doi.org/10.3892/br.2015.431