Abstract
Summary
In older men, both lower and higher total osteocalcin levels predict increased all-cause mortality, with comparable associations for cardiovascular and non-cardiovascular deaths. Differences in osteocalcin levels might influence glucose metabolism and thereby cardiovascular risk, or reflect changes in bone turnover thus representing a marker for poorer health outcomes.
Introduction
Reduced levels of total osteocalcin (TOC) are associated with adiposity, insulin resistance and type 2 diabetes, implying this bone-derived peptide might modulate cardiovascular risk. However, there are few longitudinal data relating TOC levels to survival. We examined associations of TOC level with all-cause and cardiovascular mortality in older men.
Methods
We conducted a prospective cohort study of community-dwelling men aged 70–89 years. Aliquots of plasma collected at baseline (2001–2004) were assayed for TOC. Incidence and causes of death to 31 December 2008 were ascertained using data linkage. Cox regression analyses were performed with adjustment for conventional cardiovascular risk factors.
Results
From 3,542 men followed for median 5.2 years there were 572 deaths (16.1%). Mortality was lowest in men with TOC levels in the second quintile (12.6%). In multivariate analyses, men with TOC in the lowest and highest quintiles of values had increased all-cause mortality (Q1 vs Q2: hazard ratio [HR], 1.36; 95% confidence interval 1.02–1.80 and Q5 vs Q2: HR, 1.53, 95% CI 1.18–1.98). Men with low TOC levels had similar HR for cardiovascular and non-cardiovascular deaths (Q1 vs Q2: HR, 1.35 and 1.30 respectively). Higher TOC levels predicted cardiovascular disease (CVD)-related mortality (Q5 vs Q2, HR, 1.69, 95% CI 1.09–2.64).
Conclusions
TOC predicts all-cause and CVD-related mortality in community-dwelling older men. However, the relationship is U shaped with men at both ends of the distribution at increased risk. Further investigation is required to clarify whether the underlying mechanisms involve altered bone turnover or relate specifically to the biological activity of osteocalcin.
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Acknowledgements
The authors thank Dr. George Koumantakis of Roche Diagnostics Australia for facilitating supply of assay reagents, Johnson Setoh and Seamus Duffy for technical assistance, staff of Shenton Park Hospital and all the participants in the Western Australian Abdominal Aortic Aneurysm Program and the Health In Men Study. We also acknowledge assistance received from the Data Linkage Unit of the Health Department of Western Australia.
Hormone assays were funded by research grants from the Fremantle Hospital Medical Research Foundation, Fremantle Hospital, WA, Australia and the Ada Bartholomew Medical Research Trust, University of Western Australia. The Health In Men Study was funded by Project Grants 279408, 379600, 403963 and 513823 from the National Health and Medical Research Council of Australia (NHMRC). BBY is recipient of a Clinical Investigator Award from the Sylvia and Charles Viertel Charitable Foundation, NSW, Australia. PEN is supported by NHMRC Practitioner Fellowship 458505.
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Yeap, B.B., Chubb, S.P., Flicker, L. et al. Associations of total osteocalcin with all-cause and cardiovascular mortality in older men. The Health In Men Study. Osteoporos Int 23, 599–606 (2012). https://doi.org/10.1007/s00198-011-1586-1
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DOI: https://doi.org/10.1007/s00198-011-1586-1