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Association between vitamin D receptor polymorphisms and osteoporosis in patients with COPD

Authors Kim SW, Lee JM, Ha JH, Kang HH, Rhee CK, Kim JW, Moon HS, Baek KH, Lee SH

Received 4 July 2015

Accepted for publication 5 August 2015

Published 4 September 2015 Volume 2015:10(1) Pages 1809—1817

DOI https://doi.org/10.2147/COPD.S91576

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Professor Hsiao-Chi Chuang

Peer reviewer comments 2

Editor who approved publication: Dr Richard Russell

Sei Won Kim,1 Jong Min Lee,1 Jick Hwan Ha,1 Hyeon Hui Kang,1 Chin Kook Rhee,1 Jin Woo Kim,1 Hwa Sik Moon,1 Ki Hyun Baek,2 Sang Haak Lee1

1Division of Pulmonology, Critical Care and Sleep Medicine, 2Division of Endocrinology and Metabolism, Department of Internal Medicine, St Paul’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea

Background: Patients with COPD are at an increased risk of osteoporosis. Although many studies have addressed the relationship between the vitamin D receptor (VDR) polymorphisms and bone health, this relationship has not been fully investigated in patients with COPD. In this study, we investigated the association of VDR polymorphisms with bone mineral density (BMD) and other clinical parameters in patients with COPD.
Patients and methods: In total, 200 patients with COPD were included in this study. The VDR polymorphisms rs1544410 (A/G-BsmI), rs7975232 (A/C-ApaI), rs731236 (C/T-TaqI), and rs10735810 (C/T-FokI) were determined by Sanger sequencing using blood DNA samples. BMD of the lumbar vertebra and the femoral neck was measured by dual-energy X-ray absorptiometry. Other clinical parameters were also evaluated. Haplotype and multivariate analyses were also performed.
Results: Sex, body mass index, steroid use, percentage of forced expiratory volume in 1 second (FEV1), alkaline phosphatase, and 25-hydroxyvitamin D significantly influenced the risk of osteoporosis. Patients with osteoporosis were more likely to carry the rs7975232 C allele compared to normal patients with BMD. Haplotypes GCT and GAT were related to osteoporosis. Patients without the haplotype GAT allele showed a significantly lower T-score at the femoral neck and an increased risk of osteoporosis (odds ratio [OR]= 2.78, 95% confidence interval [CI]= 1.20–6.48, P=0.018) compared with carriers in the dominant model.
Conclusion: Genetic variations in VDR are significantly associated with osteoporosis among patients with COPD. Further studies are required to confirm the role of the VDR polymorphisms in osteoporosis among patients with COPD.

Keywords: chronic obstructive pulmonary disease, osteoporosis, vitamin D receptor gene, polymorphism, haplotype

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