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Relation between fibroblast growth factor-23, body weight and bone mineral density in elderly men

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Abstract

Summary

We evaluated the relation between serum FGF23 and bone mineral density (BMD) in a community-based cohort of elderly men. There was a weak correlation between FGF23 and BMD, which was primarily dependent on body weight.

Introduction

FGF23 is a hormonal factor produced in bone and regulates serum levels of phosphate (Pi) and vitamin D. FGF23 over-expression is associated with skeletal abnormalities, including rickets/osteomalacia. The relation between FGF23 and Bone Mineral Density (BMD) in the community remains unexplored.

Methods

We employed a large, population-based cohort of 3014 Swedish men aged 69–80 years, without known renal disease. BMD was measured with dual X-ray absorptiometry (DXA) in the hip and lumbar spine. Serum intact FGF23 was analyzed with a two-site monoclonal ELISA.

Results

There was a weak but significant correlation between FGF23 and BMD in femoral neck (r = 0.04, p < 0.05), femoral trochanter (r = 0.05, p = 0.004), total hip (r = 0.06, p = 0.0015) and lumbar spine (r = 0.07, p = 0.0004). The correlations remained significant when adjusting for biochemical covariates (Pi, calcium, PTH, 25(OH)D and renal function). However, the association became insignificant in all regions when adjusting for established confounding variables including age, height, weight and smoking. Further analysis confirmed a significant correlation between FGF23 and body weight (r = 0.13, p < 0.0001).

Conclusions

The weak correlation between FGF23 and BMD in elderly male subjects is mainly due to an association between FGF23 and body weight. Therefore, FGF23 may not play a significant role in the hormonal regulation of BMD.

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Acknowledgements

We are in sincere debt and are deeply grateful to the senior professor Olof Johnell, who played a vital role during the initiation phase of the MrOS study.

The authors would also like to thank Anna-Lena Johansson, Violja Mixhue, Karin Önnby, Inger Abrahamsson, Maud Petterson, Ann-Charlotte Adolfsson and Marja Gustafsson for excellent technical assistance.

Conflicts of interest

None.

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Correspondence to T. E. Larsson.

Additional information

Richard Marsell and Majd A. I. Mirza contributed equally to this work.

Funding source: this study was supported by the Swedish Research Council, the Novo Nordisk Foundation, the Swedish Kidney Foundation and the Swedish Society of Medicine.

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Marsell, R., Mirza, M.A.I., Mallmin, H. et al. Relation between fibroblast growth factor-23, body weight and bone mineral density in elderly men. Osteoporos Int 20, 1167–1173 (2009). https://doi.org/10.1007/s00198-008-0780-2

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  • DOI: https://doi.org/10.1007/s00198-008-0780-2

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