Presence of Antideoxyribonucleic Acid Antibody in Patients with Hyperthyroidism of Graves’ Disease*

In 16 untreated patients with hyperthyroidism due to Graves' disease, serum antidouble stranded DNA antibody, measured by RIA, was positive (greater than 20 U/ml) in 14. In methimazole-treated patients with T3-suppressible thyroid uptake, anti-DNA antibody was found in 9% (3 of 35). The frequency of positive tests in methimazole-treated patients with T3-nonsuppressible thyroid uptake and in surgically treated patients was 24% (5 of 21) and 57% (4 of 7), respectively. Among anti-DNA antibody-negative (less than 9 U/ml) and weakly positive (10-19 U/ml) patients, those with T3-suppressible thyroid uptake had lower anti-DNA antibody titers than those with T3-nonsuppressible thyroid uptake. Among 32 patients with Hashimoto's thyroiditis, anti-DNA antibody was positive in 7. None of the patients with simple goiter had positive or weakly positive anti-DNA antibody results. Although the quantity of antibodies did not correlate well in individual patients, the rates of positive TSH binding-inhibiting immunoglobulin and anti-DNA antibody tests were roughly comparable in these patient groups. None of these patients with thyroid disease associated with anti-DNA antibody had clinical or other serological evidence suggestive of systemic lupus erythematosus or related collagen vascular disorders. The finding of anti-DNA antibody provides a new aspect of immunological abnormality associated with hyperthyroidism of Graves' disease.