Table of Contents Author Guidelines Submit a Manuscript
International Journal of Endocrinology
Volume 2012 (2012), Article ID 684323, 11 pages
http://dx.doi.org/10.1155/2012/684323
Research Article

Interactions between Serum Adipokines and Osteocalcin in Older Patients with Hip Fracture

1Department of Geriatric Medicine, The Canberra Hospital, Canberra, P.O. Box 11, Woden, ACT 2606, Australia
2Australian National University Medical School Canberra, Canberra, ACT 0200, Australia
3Department of Orthopaedic Surgery, The Canberra Hospital, P.O. Box 11, Woden, ACT 2606, Australia

Received 28 October 2011; Accepted 17 December 2011

Academic Editor: Huan Cai

Copyright © 2012 Alexander Fisher et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Introduction. Experiments on genetically modified animals have discovered a complex cross-regulation between adipokines (leptin, adiponectin) and osteocalcin. The relationships between these molecules in human osteoporosis are still unclear. We evaluated the hypothesis of a bidirectional link between adipokines and osteocalcin. Materials and Methods. In a cross-sectional study of 294 older patients with osteoporotic hip fracture, we estimated serum concentrations of leptin, adiponectin, resistin, osteocalcin, parameters of mineral metabolism, and renal function. Results. After adjustment for multiple potential confounders, serum osteocalcin concentration was inversely associated with resistin and positively with leptin, leptin/resistin ratio, and adiponectin/resistin ratio. In multivariate regression models, osteocalcin was an independent predictor of serum leptin, resistin, leptin/resistin, and adiponectin/resistin ratios. Conclusions. Our data support the bidirectional regulation between osteocalcin and adipokines, but contrary to the genetically modified animal models, in older subjects with osteoporotic hip fracture, serum osteocalcin is positively associated with leptin and inversely with resistin.