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Effects of long-term, high-dose bovine thyrotropin administration on human thyroid tissues from patients with graves’ disease and normal subjects xenografted into nude mice

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Abstract

We have attempted to determine whether the administration of thyrotropin would have any different functional or histological effects on Graves’ tissue as opposed to human normal thyroid tissue in an in vivo situation (i.e., after xenograft into nude athymic mice). A dosage of 0.03 units per mouse of bovine thyroid-stimulating hormone (b-TSH) was injected intraperitoneally daily for 6 consecutive weeks into xenografted mice. The parameters measured included the free T4 index and thyroid autoantibodies during the course of b-TSH injections. Tritiated (3H)-thymidine incorporation into thyroid epithelial cells (TECs) and TEC HLA-DR expression were measured in the thyroid tissue at the time of human surgery and at sacrifice; in addition, light-microscopical observations were made at those times. Although there was a decline in free T4 index values during the course of the study, there was light-microscopical evidence suggestive of hyperplasia in both types of xenografted thyroid tissue. The TSH appeared to result in thyrocyte down-regulation, possibly of receptor or postreceptor origin. The administration of the b-TSH seemed to induce TEC HLA-DR expression in this study. Because these results differ from the effects of TSH on TEC in vitro with respect to TEC HLA-DR expression, it may be postulated that there are other factors liberated in vivo in the nude mice that interact with the TEC and TSH and initiate the TEC HLA-DR expression. We conclude that there are no significant differences between the responses of Graves’ tissue and the normal human thyroid tissue in these studies.

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Authors and Affiliations

  1. Endocrinology Research Laboratory, Departments of Medicine, Wellesley Hospital, University of Toronto, Toronto, Ontario, Canada

    Yoshio Kasuga, Sunao Matsubayashi, Fumito Akasu & Robert Volpé

  2. Endocrinology Research Laboratory, Departments of Pathology, Wellesley Hospital, University of Toronto, Toronto, Ontario, Canada

    Naomi Miller

  3. Endocrinology Research Laboratory, Departments of Surgery, Wellesley Hospital, University of Toronto, Toronto, Ontario, Canada

    Christopher Jamieson

Authors
  1. Yoshio Kasuga
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  2. Sunao Matsubayashi
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  3. Fumito Akasu
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  4. Naomi Miller
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  5. Christopher Jamieson
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  6. Robert Volpé
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Kasuga, Y., Matsubayashi, S., Akasu, F. et al. Effects of long-term, high-dose bovine thyrotropin administration on human thyroid tissues from patients with graves’ disease and normal subjects xenografted into nude mice. Endocr Pathol 1, 220–227 (1990). https://doi.org/10.1007/BF02915415

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