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We synthesized four peptides (HTg-1, 1-10; HTg-2, 2547-2558; HTg-4, 2592-2603 and HTg-6, 2737-2748) and two peptides (HTg-3, 2582-2591 and HTg-5, 2687-2694) with or without hormonogenic acceptor tyrosine of human thyroglobulin (hTg). They were iodinated with 127I or 125I. 127I-labeled peptides were tested for their ability to displace 125I-T4 binding to thyroid hormone autoantibodies (THAA) in two cases of Graves' disease and to a murine anti-hTg monoclonal antibody with anti-T4 activity (mAb). 125I-labeled peptides were tested for the direct binding to the aforementioned antibodies. None of the peptides displaced 125I-T4 binding to THAA or to a mAb, or exhibited increased binding to THAA and to a mAb. 125I-T4 binding to a mAb was equally displaced by hTgs obtained from a normal thyroid gland (NTg) and a case of Hürthle cell adenoma with undetectable iodine content (CTg). 125I-T4 binding to serum gamma globulin in each patient's serum was completely displaced by NTg, but CTg displaced 125I-T4 binding 2% and 5% in Case 1 and Case 2, respectively. It was speculated that the mAb recognizes a topological epitope around the hormonogenic site of hTg, while that of THAA in our two cases recognizes only T4 or an iodine dependent topological epitope(s) of hTg.

endocrine journal

Immune Recognition of Hormonogenic Sites of Human Thyroglobulin: Studies of Graves' Sera and A Murine Monoclonal Antibody with Thyroid Hormone Antibody Activity.