Thyroid cell MHC class II antigens:

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Abstract
An association exists between certain MHC polymorphisms and autoimmune thyroid disease in animals and humans. The observation of MHC class II antigen expression by the thyroid suggests that such associations may have mechanistic explanations at the level of the thyroid cell. Such class II antigen expression, rather than being a constitutive property of thyroid epithelium, appears to be primarily mediated by lymphokine secretion from intrathyroidal T lymphocytes and a variety of agents, for example TSH and TSH receptor antibodies, may amplify such lymphokine action. Thyroid cell class II antigens participate in activation and amplification of T cells and are involved in presentation of thyroid antigen to the immune system. The relationship between these local immune interactions and the initial events leading to the development of autoimmune thyroid disease requires a more fundamental understanding of the workings of the immune system at the site of antigenic stimulation.

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