Application of Improved Coupling Assay Method for Peroxidase of Diseased Thyroids: Report of Three Cases
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概要
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Recently we have developed an assay method for peroxidase-catalyzed coupling of iodotyronine residues of thyroglobulin, which is applicable to human diseased thyroid tissues. In the present study, the assay method as well as usual peroxidase assay methods were applied to thyroids of three patients (No.1: familial goiter with impaired thyroglobulin synthesis, No.2: mild chronic thyroiditis, No.3: dyshormonogenetic goiter) who showed organification of iodine with high TSH levels and low thyroid hormone levels in sera. In general, these patients showed relatively high activities measured by guaiacol oxidation assay, iodide oxidation and coupling assay compared with those of control thyroids. lodothyronine content in thyroglobulin was very low except thyroxine in No.2. These results indicate that factors other than peroxidase may be responsible for the cause of the hypothyroid state. The coupling assay method used here is therefore useful for the detection of the ‘coupling defect’ in patients in a hypothyroid state.
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