Abstract
Although cross-sectional and longitudinal studies report a relationship between osteoporosis and cardiovascular disorders (known as the bone-cardiovascular axis), the benefits of osteoporosis treatment on atherosclerosis are largely unclear. Teriparatide is a bone-forming agent that increases urinary phosphate excretion. Because elevated serum phosphate is associated with the development of atherosclerosis, the purpose of our study was to examine the relationship among lumbar spine bone mineral density (LS-BMD), intima-media thickness at the carotid artery (CA-IMT), and phosphate metabolism in response to daily teriparatide therapy. Osteoporotic patients (n = 28) with low LS-BMD (T-score < −2.5) and/or at least one vertebral fracture were treated with teriparatide (20 μg/day) for 12 months. Metabolic bone markers, LS-BMD, and CA-IMT were measured over the course of treatment. The LS-BMD significantly increased by 0.046 ± 0.038 g/cm2 over the 12-month period (P < 0.001). CA-IMT decreased from 0.701 mm (interquartile range: 0.655–0.774 mm) at baseline to 0.525 mm (0.477–0.670 mm) at 12 months (P < 0.05); however, CA-IMT change was not significantly associated with LS-BMD change. Serum phosphate decreased after 1 month of teriparatide administration, and the change in serum phosphate at 1 months was associated with the change in CA-IMT at 12 months (ρ = 0.431, P = 0.025). Teriparatide improved LS-BMD and CA-IMT, suggesting the existence of the bone–cardiovascular axis. The association between serum phosphate and CA-IMT suggests that the teriparatide decreased CA-IMT in part by reducing serum phosphate, a well-known vascular toxin, in addition to the improvement of bone–cardiovascular axis.
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Acknowledgments
Maki Yoda contributed to the acquisition, analysis, and interpretation of the data. Yasuo Imanishi and Masaaki Inaba contributed to the conception and design of the study. Yuki Nagata, Masaya Ohara, Koichiro Yoda, Shinsuke Yamada, and Katsuhito Mori contributed to the acquisition of data. Maki Yoda and Koichiro Yoda take responsibility for the integrity of the data analysis. All authors participated in drafting or revising the manuscript and approved the final version of the manuscript for submission.
Conflict of interest
Masaaki Inaba reports grant support and lecture fees from Eli Lilly Japan K.K. Yasuo Imanishi and Katsuhito Mori report lecture fees from Eli Lilly Japan K.K. Maki Yoda, Yuki Nagata, Masaya Ohara, Koichiro Yoda, and Shinsuke Yamada have no conflicts of interest.
Human and Animal Rights and Informed Consent
All participants provided written informed consent before participating in this study, which received institutional ethics committee approval (Osaka City University Graduate School of Medicine, registration number 1775) and was conducted in accordance with the principles of the Declaration of Helsinki.
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Yoda, M., Imanishi, Y., Nagata, Y. et al. Teriparatide Therapy Reduces Serum Phosphate and Intima-Media Thickness at the Carotid Wall Artery in Patients with Osteoporosis. Calcif Tissue Int 97, 32–39 (2015). https://doi.org/10.1007/s00223-015-0007-4
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DOI: https://doi.org/10.1007/s00223-015-0007-4