Abstract
Summary
We determined whether suppression of sclerostin levels by estrogen treatment was mediated by anti-resorptive effect. Raloxifene, but not bisphosphonates, suppressed circulating sclerostin concentration, suggesting that sclerostin may mediate the action of estrogen on bone metabolism, independently of their anti-resorptive effects.
Introduction
Circulating sclerostin concentrations are higher in postmenopausal than in premenopausal women, and estrogen treatment suppresses sclerostin levels in both men and women. We determined whether anti-resorptives may suppress the circulating sclerostin levels.
Methods
We conducted a retrospective observational study. Eighty postmenopausal women were treated with raloxifene for 19.4 ± 7.7 months (n = 16), bisphosphonates for 19.2 ± 6.7 months (n = 32), or were untreated (n = 32) for 17.1 ± 4.6 months. Plasma sclerostin concentrations were measured before and after treatment.
Results
Plasma sclerostin levels after treatment were significantly lower in the raloxifene than in the control group (55.8 ± 23.4 pmol/l vs. 92.1 ± 50.4 pmol/l, p = 0.046), but were similar between the bisphosphonate and control groups. Relative to baseline, raloxifene treatment markedly reduced plasma sclerostin concentration (−40.7 ± 22.8%, p < 0.001), with respect to both control (−7.5 ± 29.1%) and bisphosphonate (−3.1 ± 35.2%) groups. Changes in bone-specific alkaline phosphatase and osteocalcin levels showed reverse associations with sclerostin concentration changes in the raloxifene (γ = −0.505, p = 0.017) and control (γ = −0.410, p = 0.020) groups.
Conclusions
Raloxifene, but not bisphosphonates, significantly suppressed circulating sclerostin concentration, suggesting that sclerostin may mediate the action of estrogen on bone metabolism, independently of their anti-resorptive effects.
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Acknowledgments
This study was supported by a grant of the Korea Healthcare Technology R&D Project, Ministry for Health, Welfare and Family Affairs, Republic of Korea. (Project no. A010252), a grant from the Korean Ministry of Education, Science & Technology (FPR08B1-170) of the 21C Frontier Functional Proteomics Program, and grants (2001–026, 2010–0354) from the Asan Institute for Life Sciences, Seoul, Korea.
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Yun Ey Chung and Seung Hun Lee equally contributed to this work.
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Chung, Y.E., Lee, S.H., Lee, SY. et al. Long-term treatment with raloxifene, but not bisphosphonates, reduces circulating sclerostin levels in postmenopausal women. Osteoporos Int 23, 1235–1243 (2012). https://doi.org/10.1007/s00198-011-1675-1
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DOI: https://doi.org/10.1007/s00198-011-1675-1