Abstract
Background: The mechanisms regulating the anabolic response of the skeleton for recombinant human PTH (1–34) [rhPTH (1–34)] administration has not been fully elucidated. Aim: The aim of this study was to evaluate the effect of rhPTH (1–34) on serum levels of runt-related transcription factor 2 (Runx2) in women with osteoporosis. Methods: Sixty postmenopausal women with osteoporosis (EO group) and 45 control subjects (NC group) were enrolled in this study. The EO group received daily injection of 20 µg rhPTH (1–34) plus oral 500 mg elemental calcium and 400 IU vitamin D3 for 6 months. Runx2 and Matrix metalloproteinase 13 (MMP-13) were measured with commercially available enzyme-linked immunosorbent assay kits. Bone mineral density (BMD) was also measured before and 6 months after rhPTH (1–34) treatment. Results: Serum total Ca2+, phosphate, and bone-specific alkaline phosphatase were significantly increased (p<0.05 or p<0.01), and the lumbar spine BMD (LS-BMD) was also increased by 4% in patients with osteoporosis after treatment with rhPTH (1–34) (p<0.05). On the contrary, serum Runx2 and MMP-13 were significantly decreased at post treatment (13.1% and 36.6%, respectively, p<0.05 and p<0.01). At baseline, serum Runx2 positively correlated with MMP-13 (r=0.74, p<0.01), the correction remained after adjusting for age and body mass index. Conclusion: The daily injection of rhPTH (1–34) was able to stimulate bone formation. The therapy of 20 µg rhPTH (1–34) for 6 months resulted in decrease of serum Runx2 and MMP-13. These changes might reflect the increase of active osteoblasts and the better bone homeostasis.
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Zhu, W., Yang, M.L., Yang, G.Y. et al. Changes in serum runt-related transcription factor 2 levels after a 6-month treatment with recombinant human parathyroid hormone in patients with osteoporosis. J Endocrinol Invest 35, 602–606 (2012). https://doi.org/10.3275/8110
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DOI: https://doi.org/10.3275/8110