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CCR7 is involved in the initiation of immune responses and has been recently implicated in the control of tolerance. To analyze the role of CCR7 in autoimmunity, we backcrossed CCR7(ko/ko) mice (in which ko signifies deficient) onto the autoimmune-prone NOD background. Surprisingly, NODCCR7(ko/ko) mice never developed diabetes, but showed severe inflammation in multiple tissues including thyroid, lung, stomach, intestine, uterus, and testis. NODCCR7(ko/ko) mice had a marked enlargement of the thyroid gland (goiter) that was associated with circulating autoantibodies against thyroglobulin, and development of primary hypothyroidism (decreased levels of serum thyroxin, and augmented levels of thyroid-stimulating hormone in the pituitary gland), features found in Hashimoto's thyroiditis. Cells isolated from diseased thyroids and activated splenocytes from NODCCR7(ko/ko) animals induced goiter in NOD.SCID recipients, demonstrating that autoreactive cells were generated in the absence of CCR7. Moreover, thyroid disease could be accelerated in young NODCCR7(ko/ko) mice by immunization with thyroglobulin. These results demonstrate the complexity in the generation of multiple autoimmune phenotypes in NOD mice and indicate that CCR7 is a key molecule in their development.

CCR7 Deficiency in NOD Mice Leads to Thyroiditis and Primary Hypothyroidism