Vitamin D and Immune Function

Prof. Hewison’s group is at the forefront of research linking vitamin D and the immune system, with implications for a wide range of clinical disorders including infectious, inflammatory and autoimmune disease. Current studies are focused on the analysis of vitamin D-insensitivity in T lymphocytes from the inflamed joints of patients with rheumatoid arthritis. This may provide an explanation for the limited success of vitamin D supplementation in some clinical trials. Other projects have explored the role of cell metabolism pathways in mediating the immunomodulatory effects of vitamin D, and the opportunities this may provide for improved therapeutic use of vitamin D. The Hewison group has also pioneered a range of studies to explore alternative markers of vitamin D ‘status’. This includes development of novel high throughput liquid chromatography-tandem mass spectrometry technology to measure multiple metabolites of vitamin D – the vitamin D metabolome – and analysis of the role of the serum vitamin D binding protein as a determinant of vitamin D bioavailability within the immune system.