Osteocalcin, vascular calcification, and atherosclerosis: a systematic review and meta-analysis

Millar, Sophie A. and Patel, Hinal and Anderson, Susan I. and England, Timothy J. and O'Sullivan, Saoirse (2017) Osteocalcin, vascular calcification, and atherosclerosis: a systematic review and meta-analysis. Frontiers in Endocrinology, 8 . 183/1-183/15. ISSN 1664-2392

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Abstract

Background: Osteocalcin (OC) is an intriguing hormone, concomitantly being the most abundant non-collagenous peptide found in the mineralized matrix of bone, and expanding the endocrine function of the skeleton with far reaching extra-osseous effects. A new line of enquiry between OC and vascular calcification has emerged in response to observations that the mechanism of vascular calcification resembles that of bone mineralisation. To date, studies have reported mixed results. This systematic review and meta-analysis aimed to identify any association between OC and vascular calcification and atherosclerosis.

Methods and results: Databases were searched for original, peer reviewed human studies. A total of 1,453 articles were retrieved, of which 46 met the eligibility criteria. Overall 26 positive, 17 negative, and 29 neutral relationships were reported for assessments between OC (either concentration in blood, presence of OC-positive cells, or histological staining for OC) and extent of calcification or atherosclerosis. Studies that measured OC-positive cells or histological staining for OC reported positive relationships (11 studies). A higher percentage of Asian studies found a negative relationship (36%) in contrast to European studies (6%). Studies examining carboxylated and undercarboxylated forms of OC in the blood failed to report consistent results. The meta-analysis found no significant difference between OC concentration in the blood between patients with “atherosclerosis” and control (p = 0.13, n = 1,197).

Conclusion: No definitive association was determined between OC and vascular calcification or atherosclerosis; however, the presence of OC-positive cells and histological staining had a consistent positive correlation with calcification or atherosclerosis. The review highlighted several themes, which may influence OC within differing populations leading to inconclusive results. Large, longitudinal studies are required to further current understanding of the clinical relevance of OC in vascular calcification and atherosclerosis.

Item Type: Article
Keywords: osteocalcin, calcification, atherosclerosis, bone hormone, vascular disease, bone glutamic acid protein
Schools/Departments: University of Nottingham, UK > Faculty of Medicine and Health Sciences > School of Medicine > Division of Medical Sciences and Graduate Entry Medicine
Identification Number: 10.3389/fendo.2017.00183
Depositing User: Eprints, Support
Date Deposited: 04 Aug 2017 10:46
Last Modified: 04 Aug 2017 11:08
URI: http://eprints.nottingham.ac.uk/id/eprint/44688

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