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Journal of Clinical Endocrinology & Metabolism, Vol 76, 223-230, Copyright © 1993 by Endocrine Society

ARTICLES

Reconstitution of severe combined immunodeficient mice with intrathyroidal lymphocytes of thyroid xenografts from patients with Hashimoto's thyroiditis

F Akasu, T Morita, E Resetkova, N Miller, R Akasu, C Jamieson and R Volpe
Department of Medicine, Wellesley Hospital, University of Toronto, Ontario, Canada.

Thyroid tissues from patients with Hashimoto's thyroiditis (HT) have been xenografted to both severe combined immunodeficiency (SCID) mice and nude mice to study the intrathyroidal lymphocytes which were expected to migrate from the xenografts in the SCID mice. Peripheral blood mononuclear cells from HT, Graves' disease, and normal donors have also been separately engrafted. SCID mice, but not nude mice with HT thyroid grafts produce human immunoglobulins. More immunoglobulin G (IgG), but less IgM and IgA is produced in SCID mice with HT thyroid grafts (SCID-TH), compared to SCID mice injected with peripheral blood mononuclear cells from patients with HT or normal donors (SCID-PB), suggesting that different B cell subpopulations were active in the SCID- PB vs. SCID-TH. Production of IgG by SCID-PB and SCID-TH was maintained 6 weeks after engraftment, and decreased thereafter. SCID mice but not nude mice grafted with HT thyroid tissue produce antibodies to thyroglobulin and thyroperoxidase. Lymphocytes within intact HT thyroid grafts persist in SCID mice, and migrate to the spleen, whereas human lymphocytes do not survive in the thyroid grafts or other tissues of the nude mouse. In 6 weeks, the xenografts in nude mice became histologically normal. In contrast, xenografts from SCID mice showed more marked inflammatory changes than in the original human lesion, although the ratio of T/B cells is unchanged. This worsening of the lesion may relate to the increase in activation of the T-lymphocytes.


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