Autoimmune mechanisms in inflammatory eye disease.

This paper summarises the principal immunopathological mechanisms which may underlie ocular inflammation and draws attention to how autoimmune reactions may be regulated by idiotypic networks of the immune system. The study of autoimmunity in inflammatory eye disease is illustrated by our current investigations of retinal vasculitis in man and of experimental autoimmune uveoretinitis in rodents where three lines of evidence indicate that immune complex formation may be a compensatory host response to the development of antiretinal autoimmunity. In discussing immunological implications of these results we suggest that retinal inflammation in antiretinal autoimmunity is limited by a protective anti-idiotypic antibody response and that retinal disease arises when this compensatory response is improperly balanced. The clinical implications of this reasoning include the identification of patients at risk of relapse of ocular disease and the development of therapeutic methods for restoring an imbalanced anti-idiotypic autoimmune response towards normality.