Abstract
Osteoporosis is a major comorbidity of cardio-respiratory diseases, but the mechanistic links between pulmonary arterial hypertension and bone remain elusive. The purpose of the stud was to evaluate serum adipokines and endothelin-1 (ET-1) levels in the patients with idiopathic pulmonary arterial hypertension (IPAH) NYHA class III-IV and to determine its associations with bone mineral density (BMD). Pulmonary and hemodynamic parameters, BMD Z-scores at the lumbar spine (LS) and femoral neck (FN), serum leptin, adiponectin, visfatin and endothelin-1 (ET-1), were evaluated in 32 patients with IPAH NYHA class III-IV and 30 healthy volunteers. Leptin, adiponectin and ET-1 were higher in the patients with IPAH than in healthy subjects. Visfatin level showed a tendency to increase compared to that of healthy subjects (p = 0.076). The univariate analysis revealed a positive correlation between BMD Z-scores at both sites and 6-min walk test, and inverse relation with pulmonary vascular resistance (PVR) and mean pulmonary arterial pressure (mPAP). Adiponectin and visfatin showed positive correlations with PVR (p = 0.009 and p = 0.006). Serum adiponectin, visfatin and leptin were inversely associated with Z-scores. After adjusting for BMI and FMI, such associations persisted between visfatin and adiponectin levels and Z-scores at both sites. ET-1 related to mPAP, cardiac index and PVR. Negative correlation was observed between ET-1 and FN BMD (p = 0.01). Positive correlations have revealed between ET-1 and adiponectin (p = 0.02), visfatin (p = 0.004) in IPAH patients. These results provide further evidence that adipokine and endothelial dysregulation may cause not only a decrease in BMD, but also an increase in hemodynamic disorders of IPAH.
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Acknowledgements
This study was supported by a grant from Russian Science Foundation (No. 14-33-00009). The study sponsors had no role in study design, data collection, data analysis, data interpretation and/or writing of the report. We are very grateful to Christa Burdick (University of Massachusetts Amherst, USA) for her thoughtful revision of this article.
Authors’ Contribution
EAK and VAN designed the study. LGU, YuVM, EAK were involved in patient selection and sample collection. EAK, LGU carried out the laboratory work. EAK, VAN, YuVM did the data analysis. EAK, VAN worked on interpretation of the data and writing and the manuscript. All authors revised the paper critically for intellectual content and approved the final version. EAK is the guarantor of the paper. All authors agree to be accountable for the work and to ensure that any questions relating to the accuracy and integrity of the paper are investigated and properly resolved.
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Evgenia A. Kochetkova, Vera A. Nevzorova, Ludmila G. Ugai, and Yulia V. Maistrovskaia declare that they have no conflict of interest.
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Kochetkova, E.A., Ugai, L.G., Maistrovskaia, Y.V. et al. Adipokines: A Possible Contribution to Vascular and Bone Remodeling in Idiopathic Pulmonary Arterial Hypertension. Calcif Tissue Int 100, 325–331 (2017). https://doi.org/10.1007/s00223-016-0224-5
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DOI: https://doi.org/10.1007/s00223-016-0224-5