Vitamin D insufficiency correlates with peripheral B10 cells in patients with pituitary tumours.

The mechanism of pituitary gland tumour (PGT) is unclear. Aberrant immune tolerance is associated with the pathogenesis of tumour. Vitamin D and vitamin D receptor (VDR) are involved in the immune regulation. Interleukin (IL)-10 is one of the important immune regulatory molecules. This study aims to elucidate the role of VDR in the regulation of IL-10 in peripheral B cells of PGT patients. In this study, the peripheral blood samples were collected from PGT patients and healthy subjects. B cells were purified from the blood samples and analysed by RT-qPCR and Western blotting. The correlation between the expression of IL-10 and VDR in the B cells was assessed. We observed that the serum VitD levels were negatively correlated with IL-10 expression in peripheral B cells of patients with PGT. Low levels of VDR expression were found in peripheral B cells of PGT patients. Exposure to VitD suppressed the expression of IL-10 in B cells. The VDR bounds the transcription factor of IL-10 to interfere with the expression of IL-10 in B cells. The VDR agonists inhibited IL-10 expression in B cells from PGT patients. In conclusion, modulation of the expression of VDR can regulate the expression of IL-10 in peripheral B cells of PGT patients, which may contribute to the treatment of PGT.