Medicine (Baltimore). 2015 Sep;94(39):e1639.
Ma J1, Wu D, Li C, Fan C, Chao N, Liu J, Li Y, Wang R, Miao W, Guan H, Shan Z, Teng W.
1From the Department of Endocrinology and Metabolism, The Endocrine Institute and The Liaoning Provincial Key Laboratory of Endocrine Diseases (JM, DW, CF, NC, JL, YL, RW, WM, HG, ZS, WT), The First Affiliated Hospital of China Medical University; and Department of Gynecology and Obstetrics (CL), Shenyang Women's and Children's Hospital, Shenyang, Liaoning, PR China.
Autoimmune thyroid diseases (AITD) are common autoimmune disorders. A few studies have analyzed the association between serum vitamin D levels and AITD, and available data remain inconclusive.The aim of this study was to evaluate the association between serum vitamin D levels and 3 types of AITD, that is
- Graves' disease (GD),
- Hashimoto's thyroiditis (HT), and
- postpartum thyroiditis (PPT).
Two independent case-control studies were designed. The first is a cross-sectional case-control study in which we examined the levels of 25(OH)D in patients with newly diagnosed GD or HT and in controls; the second is a nested case-control study in which we compared 25(OH)D levels in 610 women who developed PPT during the follow-up after delivery and those who did not.Compared with the controls, GD patients and HT patients had significantly lower 25(OH)D levels. PPT cases also had a lower serum 25(OH)D concentration than controls. Serum 25(OH)D levels were associated with neither antithyroid peroxidase antibody nor antithyroglobulin antibody in GD and HT. There was no significant relationship between thyroid-stimulating hormone and 25(OH)D levels.
Every 5 nmol/L increase in serum 25(OH)D concentrations was associated with a
1.55-, 1.62-, and 1.51-fold reduction in GD, HT, and PPT risk, respectively.
We observed a lower serum vitamin D levels in AITD patients compared with controls. The lower the vitamin D level is, not vitamin D deficiency per se, the higher the risk for developing AITD will be. However, vitamin D does not have strong association with the titers of thyroid antibodies or the levels of thyroid hormones.
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