#$%^&*AU2013237703B220160324.pdf#####The present invention relates to improved methods of suppressing and/or preventing an undesired immune response comprising the use of CD83. In some embodiments, CD83 is coadministered to a subject with at least one other immunosuppressive compound. Method of the invention can be used to prevent or reduce the severity of autoimmune diseases and can also be used to induce tolerance to at least one therapeutic composition, such as a therapeutic protein or transplanted tissue.