Development of experimental autoimmune encephalomyelitis (EAE) in mice requires vitamin D and the vitamin D receptor

The development of experimental autoimmune encephalomyelitis (EAE), a model of multiple sclerosis, has been studied in mice that were (i) vitamin D-deficient, (ii) minus the vitamin D receptor, (iii) minus a vitamin D 25-hydroxylase, and (iv) minus the vitamin D 25-hydroxyvitamin D-1 alpha-hydroxylase. EAE development was markedly suppressed in mice lacking the vitamin D receptor and partially suppressed in vitamin D-insufficient mice. However, the absence of either of the two key hydroxylases (i. e., 25-hydroxylase and 1 alpha-hydroxylase) neither inhibits nor enhances the development of EAE. These results indicate that vitamin D and the vitamin D receptor are required for the development of EAE. The results also suggest that 1,25-dihydroxyvitamin D3 may not play a role in this autoimmune response.