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Limits Experimental Autoimmune Thyroiditis by Suppressing Lymphocyte Activation in Cervical Lymph Nodes1
* Department of Pathology, School of Medicine, and
W. Harry Feinstone Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205
The role of IFN-
in the pathogenesis of autoimmune disease is controversial, being described as immunostimulatory in some studies and immunosuppressive in others. To determine the contribution of local expression of IFN-, we derived NOD.H-2h4 transgenic mice overexpressing IFN- in a thyroid-restricted manner. Transgenic mice, which had serum IFN- levels similar to wild-type littermates, showed up-regulation of MHC class II on thyrocytes, but did not develop spontaneous thyroiditis. Upon immunization with murine thyroglobulin, transgenic mice developed milder disease and reduced IgG1 responses compared with wild type. The milder disease was associated with decreased frequency of activated CD44+ lymphocytes in the cervical lymph nodes. This suppressive effect was confirmed by showing that blockade of systemic IFN- with mAb enhanced disease and increased IgG1 responses. The study supports a disease-limiting role of IFN- in autoimmune thyroiditis. Furthermore, it provides the first evidence that local IFN- activity in the thyroid is sufficient for disease suppression.
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