Volume 21, Issue 5 pp. 992-1000
Original Article

Effects of 25-hydroxyvitamin D and vitamin D-binding protein on bone mineral density and disease activity in Malaysian patients with rheumatoid arthritis

Tze Hao Wong

Tze Hao Wong

Pathology Division, School of Medicine, International Medical University, Kuala Lumpur, Malaysia

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Esha Das Gupta

Esha Das Gupta

Internal Medicine Department, School of Medicine, International Medical University, Seremban, Malaysia

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Ammu K. Radhakrishnan

Ammu K. Radhakrishnan

Pathology Division, School of Medicine, International Medical University, Kuala Lumpur, Malaysia

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Suk Chyn Gun

Suk Chyn Gun

Internal Medicine Department, Hospital Tuanku Jaafar, Seremban, Malaysia

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Gandhi Chembalingam

Gandhi Chembalingam

Internal Medicine Department, Hospital Tuanku Jaafar, Seremban, Malaysia

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Swan Sim Yeap

Corresponding Author

Swan Sim Yeap

Department of Medicine, Subang Jaya Medical Centre, Subang Jaya, Malaysia

Correspondence: Dr Swan Sim Yeap, Consultant Rheumatologist, Subang Jaya Medical Centre, No. 1, Jalan SS 12/1A, 47500 Subang Jaya, Selangor, Malaysia. Email: [email protected]Search for more papers by this author
First published: 20 February 2017
Citations: 5

Abstract

Aim

Vitamin D3 [25(OH)D] has been shown to be important in bone health and can influence rheumatoid arthritis (RA) disease activity. Vitamin D-binding protein (VDBP) levels vary with race and may modulate ‘bioavailable’ levels of 25(OH)D. The aim of this study was to explore the relationships between 25(OH)D, VDBP and clinical factors on bone mineral density (BMD) in a group of multi-ethnic Malaysian RA patients and healthy controls.

Methods

A cross-sectional study of 77 female RA patients and 29 controls was performed. Serum 25(OH)D was measured using the Elecsys® Vitamin D total assay. Serum VDBP was measured using a Quantikine® enzyme-linked immunosorbent assay kit. BMD was assessed using dual-energy X-ray absorptiometry (DXA).

Results

Overall, mean 25(OH)D levels were 42.66 ± 21.75 nmol/L with no significant difference between RA patients and controls. 25(OH)D levels were significantly higher in Chinese, compared to Malay/Indian subjects. In RA patients, menopausal status and body mass index (BMI) were significantly associated with BMD but not 25(OH)D or RA Disease Activity Score of 28 joints (DAS28). There was no significant correlation between 25(OH)D and DAS28, even after correction for menopausal status and BMI. VDBP levels were not significantly different between the races and did not significantly correlate with BMD, 25(OH)D overall, or DAS28 in RA patients.

Conclusions

In Malaysian RA patients, menopausal status and BMI were more important influences on BMD than 25(OH)D or RA disease activity. The utility of measuring VDBP levels in this population remains uncertain.

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