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  • Title: The species specificity of TSH receptor binding antibodies as measured by radioreceptor study.
    Author: Strakosch CR, Joyner D, Manley SW, Wall JR.
    Journal: Clin Endocrinol (Oxf); 1982 Aug; 17(2):173-9. PubMed ID: 6127179.
    Abstract:
    The species specificity of TSH binding inhibitory antibodies was compared for patients with untreated Graves' hyperthyroidism, past Graves' hyperthyroidism, active ophthalmopathy with past hyperthyroidism, and subacute thyroiditis, by measuring inhibition of TSH binding to plasma membranes prepared from human, guinea-pig, calf, pig, and dog thyroid glands in a radioreceptor assay. Results were expressed as TSH binding inhibition indices (TBII). Broad species reactivity was demonstrated. This was greatest with pig and least with guinea-pig thyroid membranes. Immunoglobulin (Ig) from patients in whom strongly positive tests with human thyroid preparations were demonstrated were usually strongly positive with all other species tested, whereas Ig from patients which were less strongly positive with human were, generally, also less positive with the other species. There was a tendency for greater species reactivity of TSH binding inhibiting antibodies from patients with treated Graves' hyperthyroidism (with or without eye disease) than of those from untreated patients with Graves' hyperthyroidism or subacute thyroiditis. Combining the data from all groups, correlation between TBII for human membranes and those of other species was best for dog and least for guinea-pig. It is concluded that the TSH binding inhibiting antibody is a polyclonal antibody against a single antigen at or near the TSH receptor, and that the degree of reactivity with its antigen in other species depends, mainly, on the amount of antibody present in the serum.
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