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The relationship between adipokines, body composition, and bone density in men with chronic obstructive pulmonary disease

Authors Vondracek S, Voelkel NF, McDermott MT, Valdez C

Published 13 July 2009 Volume 2009:4 Pages 267—277


Sheryl F Vondracek1, Norbert F Voelkel2, Michael T McDermott3, Connie Valdez1

1Department of Clinical Pharmacy; 3Department of Medicine, University of Colorado Denver, Aurora, CO, USA; 2Department of Internal Medicine and Victoria Johnson Center for Emphysema Research, Virginia Commonwealth University, Richmond, VA, USA

Abstract: Osteoporosis is common in patients with chronic obstructive pulmonary disease (COPD). Data regarding the relationship between adipokines and bone mineral density (BMD) in this population is lacking. The purpose of this pilot study was to determine associations between the adipokines tumor necrosis factor-alpha (TNF-α), leptin, adiponectin and resistin, body composition, and BMD in men with severe COPD. This was a cross-sectional study of men with severe COPD who visited the University of Colorado Hospital COPD Center. Bone density and parameters of body composition were measured by dual-energy X-ray absorptiometry. Twenty-three men were included (mean age = 66 years, mean percent predicted forced expiratory volume in one second = 32%). On bivariate analysis, there was no association between TNF-α and BMD. Parameters of body composition and serum concentrations of leptin and adiponectin were significantly associated with total hip and spine bone density. However, with partial correlation analysis, total body mass was the only independent predictor of total hip BMD, explaining approximately 50% of the variability. Overall, 18 out of 23 men enrolled (78%) had low bone density by T-score, and nine (39%) were classified as having osteoporosis. The men with osteoporosis had lower parameters of body composition, lower mean serum leptin concentrations, and a greater impairment in measures of lung function compared to the men without osteoporosis. We conclude that the effect of adipokines on BMD does not appear to be independent of body mass. However, larger studies are needed to further evaluate the relationship between adipokines, body weight, and BMD in patients with COPD.

Keywords: bone mineral density, osteoporosis, TNF-α, leptin, adiponectin, chronic obstructive pulmonary disease, adipokines

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