Autoimmunity in Addison's disease.

Addison's disease has a low incidence and is most frequently the result of an autoimmune disease in developed countries. Addison's disease can present as an isolated entity or in combination with other autoimmune diseases: Addison's disease can be part of the distinct polyglandular autoimmune syndromes APS I and II. Autoantibodies in patients with isolated Addison's disease are directed against the enzymes involved in steroid synthesis, P45oc21, P45oscc and P45oc17. Addison's disease, both isolated and in the context of APS II, has been associated with the haplotype HLA-A1, -B8 and DR3. The value of the increased expression of these molecules on adrenocortical cells could point towards an infectious pathogenesis. Given the prevalence, up to 80 %, of autoantibodies in Addison's disease as well as the high predictive value for developing the disease when antibodies are present (41% in three years), we advise screening high-risk populations, such as patients with other autoimmune endocrinopathies or their relatives for the presence of these antibodies. The adrenocortical function of patients positive for antibodies should be followed yearly.