Comparison of plasma vitamin D levels in patients with Sjogren's syndrome and healthy subjects.

AIM: Sjogren's syndrome (SS) is a systemic autoimmune disease characterized by chronic inflammation of the salivary and lacrimal glands. There is increasing evidence indicating that vitamin D is important in the initiation and propogation of a range of autoimmune diseases which may include SS. The aim of the present study was to evaluate plasma vitamin D (vit D) levels in patients with SS and to compare this with a control group. METHOD: One hundred and seven SS patients (97 [90.7%] female and 10 [9.3%] male) and 74 healthy controls (64 [86.5%] female and 10 [13.5%] male) were included into the study. Plasma baseline 25-hydroxy-vit D levels were measured by high-powered liquid chromatography method using an Agilent 1100 liquid chromatograph. RESULTS: Plasma vit D levels in SS patients (20.5 +/- 10.5 mug/L) were significantly lower than in the control group (28.4 +/- 15.2 mug/L) (P < 0.001). Female SS patients had significanly lower vit D levels (19.3 +/- 9.3 mug/L) than controls (28.3 +/- 15.8 mug/L) (P < 0.001) but this difference was not present among the male patients and controls. There was no correlation between plasma vit D levels and erythrocyte sedimentation rate and C-reactive protein in SS patients. CONCLUSION: Vit D deficiency was frequent in patients with SS. In particular, female SS patients had the risk of vit D deficiency. It may be convenient to look for vit D deficiency and to correct vit D nutritional status in SS patients.