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How do antibodies contribute to Graves disease?

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immune system disorder False-color scanning electron micrograph of a T cell infected with HIV (human immunodeficiency virus), the agent that causes AIDS (acquired immunodeficiency syndrome).

In Graves disease, an autoimmune disease, the body produces specific antibodies that play a central role in the development of hyperthyroidism.12

These antibodies are directed against the thyrotropin (thyroid-stimulating hormone, or TSH) receptors located on the surface of thyroid cells. By binding to these receptors, the antibodies mimic the action of TSH, which normally regulates thyroid hormone production. This binding triggers the thyroid gland to secrete excessive amounts of thyroid hormones, leading to the symptoms of hyperthyroidism and the characteristic enlargement of the gland known as a goiter.132

Additionally, these or closely related antibodies are believed to contribute to Graves ophthalmopathy—a condition involving eye inflammation and protrusion—and localized myxedema, though the exact mechanisms for these extra-thyroidal manifestations involve both antibody-mediated and cell-mediated processes.23