Autoimmune Mechanisms in Endocrine Disease

Autoimmune endocrine disease develops when immune tolerance fails and lymphocytes or antibodies target hormone-producing tissue. The clinical result depends on whether the immune response destroys a gland or stimulates a receptor. Destructive disease causes hormone deficiency. Type 1 diabetes destroys pancreatic beta cells, Hashimoto thyroiditis progressively reduces thyroid hormone production, and autoimmune adrenalitis destroys the adrenal cortex. Symptoms often emerge gradually, then become dangerous when physiologic stress exposes the limited hormone reserve. Receptor-stimulating disease produces hormone excess. In Graves disease, thyroid-stimulating immunoglobulins activate the TSH receptor as if TSH were continuously present. The thyroid makes excess hormone despite a suppressed pituitary TSH. These conditions cluster because the underlying vulnerability is systemic, not confined to one organ. A person with type 1 diabetes has increased risk of autoimmune thyroid disease, coeliac disease, autoimmune gastritis with B12 deficiency, and adrenal insufficiency. A person with autoimmune Addison disease needs ongoing surveillance for thyroid disease, diabetes, premature ovarian insufficiency, coeliac disease, and autoimmune gastritis. The experienced nurse notices patterns rather than isolated abnormalities: unexplained weight change plus pulse changes, persistent nausea plus hypotension, or...