Serum Vitamin D Concentration and Markers of Bone Metabolism in Perimenopausal and Postmenopausal Women with Asthma and COPD
Aging and menopause are closely related to hormonal and metabolic changes. Vitamin D is a crucial factor modulating several metabolic processes. The aim of this study was to evaluate biomarkers of bone metabolism in peri- and postmenopausal women with obstructive lung diseases. Sixty two female patients, 27 with asthma and 35 with COPD, aged over 45 years (median age 58 and 64 years, respectively) were enrolled into the study. The evaluation included lung function, bone mineral density, serum concentration of vitamin D, and bone metabolism markers. The study groups differed significantly in terms of forced expiratory volume in 1 s (FEV1); median values of 1.79 L vs. 1.16 L (p = 0.0001) and 71.2% vs. 53.0% predicted (p = 0.0072) and in vitamin D concentration (12.3 ng/ml vs. 17.6 ng/ml). Total bone mineral density (BMD) was lower in the COPD group (p = 0.0115). Serum vitamin D inversely correlated with the number of pack-years in asthma patients (r = −0.45, p = 0.0192). There was no correlation between serum vitamin D and disease duration or severity, and the Asthma Control Test (ACT) and the modified Medical Research Council (mMRC) dyspnea scores. The serum bone metabolism markers C-terminal cross-linked telopeptide of collagen type I (BCROSS), N-terminal propeptides of procollagen type-1 (tP1NP), and N-mid osteocalcin (OCN) inversely correlated with age in the COPD, but not asthma, patients (r = −0.38, p = 0.0264; r = −0.37, p = 0.0270; and r = −0.42, p = 0.0125, respectively). We conclude that peri- and postmenopausal women with obstructive lung diseases had a decreased serum concentration of vitamin D. Furthermore, vitamin D and body mineral density were appreciably lower in women with COPD than those with asthma.
KeywordsAsthma Bone metabolism markers Bone mineral density COPD Menopause Osteoporosis Pulmonary function Vitamin D
Conflicts of Interest
The authors declare no conflicts of interest in relation to this article.
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