Compositions for the treatment or prevention of multiple sclerosis are provided. In some embodiments, the composition comprises an isolated peptide comprising a partial amino acid sequence of a myelin oligodendrocyte glycoprotein (MOG) protein, wherein the peptide activates regulatory T cells. In some embodiments, the composition comprises dendritic cells pulsed with a MOG peptide that activates regulatory T cells. In some embodiments, the peptide activates HLA-E-restricted regulatory CD8+ T cells.
