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Fibrosis markers, hip fracture risk, and bone density in older adults

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Abstract

Summary

We examined whether blood levels of two markers of fibrosis (transforming growth factor beta one (TGF-β1) and procollagen type III N-terminal propeptide (PIIINP)) are related to hip fracture risk and to bone mineral density (BMD). TGF-β1 levels were associated with lower hip fracture risk in women and with lower BMD in men. PIIINP levels were not associated with either outcome.

Introduction

TGF-β1 serves several roles in bone formation and resorption. A consequence of TGF-β1 activation is the production of PIIINP, a marker of collagen III deposition. Here, we explore whether these two biomarkers are related to incident hip fracture and bone mineral density (BMD) and whether their associations are modified by systemic inflammation, as measured by C-reactive protein (CRP) levels.

Methods

Participants were from the Cardiovascular Health Study (mean age 78 years; mean follow-up 8.3 years). We included 1681 persons with measured levels of TGF-β1 (149 hip fractures) and 3226 persons with measured levels of PIIINP (310 hip fractures).

Results

Among women, higher TGF-β1 levels were associated with lower hip fracture risk (HR, per doubling, 0.78 [95 % CI 0.61, 0.91]). Among men, TGF-β1 levels were associated with hip fracture risk in a non-linear manner, but among those with elevated CRP levels, doubling was associated with increased risk of fracture (HR 2.22 [1.20, 4.08]) (p = 0.02, interaction between low and high CRP and TGF-β1 on fracture risk). TGF-β1 levels had no significant association with total hip or total body BMD in women but were significantly associated with lower BMD in men. There were no associations of PIIINP levels with hip fracture risk or BMD in men or women.

Conclusions

TGF-β1 levels appear to be associated with bone-related phenotypes in a sex-specific manner. The reasons for these differences between men and women regarding TGF-β1 levels and hip fracture risk and bone density require further investigation.

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Acknowledgments

This research was supported by contracts HHSN268201200036C, HHSN268200800007C, N01HC55222, N01HC85079, N01HC85080, N01HC85081, N01HC85082, N01HC85083, N01HC85086, and grant HL080295 from the National Heart, Lung, and Blood Institute (NHLBI), with additional contribution from the National Institute of Neurological Disorders and Stroke (NINDS). This work was also funded in part by R01 HL094555 from the National Heart, Lung, and Blood Institute (to Drs. Djoussé, Ix, Kizer, and Mukamal). A full list of principal CHS investigators and institutions can be found at www.CHS-NHLBI.org.

Conflicts of interest

Joshua I. Barzilay, Petra Bůžková, Jorge R. Kizer, Luc Djoussé, Joachim H. Ix, Howard A. Fink, David S. Siscovick, Jane A. Cauley, and Kenneth J. Mukamal declare that they have no conflicts of interest.

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Correspondence to J. I. Barzilay.

Appendix

Appendix

Table 2 Baseline characteristics of the cohort by whether the TGF-β1 and PIIINP levels are above the median level

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Barzilay, J.I., Bůžková, P., Kizer, J.R. et al. Fibrosis markers, hip fracture risk, and bone density in older adults. Osteoporos Int 27, 815–820 (2016). https://doi.org/10.1007/s00198-015-3269-9

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