title: Lower Serum 25-Hydroxyvitamin D Level is Associated With 3 Types of Autoimmune Thyroid Diseases.
abstract: 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.
authors.affiliation: From 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.
authors.forename: Jie
authors.initials: J
authors.lastname: Ma
authors.forename: Di
authors.initials: D
authors.lastname: Wu
authors.forename: Chenyang
authors.initials: C
authors.lastname: Li
authors.forename: Chenling
authors.initials: C
authors.lastname: Fan
authors.forename: Nannan
authors.initials: N
authors.lastname: Chao
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.forename: Yushu
authors.initials: Y
authors.lastname: Li
authors.forename: Renee
authors.initials: R
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Miao
authors.forename: Haixia
authors.initials: H
authors.lastname: Guan
authors.forename: Zhongyan
authors.initials: Z
authors.lastname: Shan
authors.forename: Weiping
authors.initials: W
authors.lastname: Teng
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001323:Autoantibodies / Q000097:blood; D016022:Case-Control Studies; D003430:Cross-Sectional Studies; D005260:Female; D006111:Graves Disease / Q000097:blood*; D050031:Hashimoto Disease / Q000097:blood*; D006801:Humans; D008297:Male; D008875:Middle Aged; D050032:Postpartum Thyroiditis / Q000097:blood*; D011989:Receptors, Thyrotropin / Q000097:blood / Q000276:immunology; D013963:Thyroid Hormones / Q000097:blood / Q000276:immunology; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000097:blood; D055815:Young Adult
chemical_list: D001323:Autoantibodies; D011989:Receptors, Thyrotropin; D013963:Thyroid Hormones; C006606:anti-thyroglobulin; D014807:Vitamin D; C104450:25-hydroxyvitamin D