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• W2137888971 abstract "Despite thyroid tissue heterogeneity, biochemical and morphological features have been associated with certain thyroid diseases. We analyzed the ultracytochemical localization of thyroperoxidase (TPO), TPO-associated hydrogen peroxide-generating sites (H2O2 sites), and monoamine oxidase (MAO) in terms of morphology and biochemical TPO activity in abnormal thyroids. We examined 11 cases of nontoxic multinodular goiter, 5 cases of Hashimoto’s thyroiditis, 1 case of oncocytic (Hürthle or oxyphilic cell) adenoma, 5 cases of Graves’ disease, 4 cases of papillary carcinoma, and 4 cases of perinodular normal tissue. In the perinodular tissue, TPO was detected mainly in the nuclear envelope, rough endoplasmic reticulum (RER), and subapical vesicles, but not in the apical surface. In multinodular goiter, heterogeneous TPO reactivity ranging from almost null to strongly positive was detected in similar locations as in the perinodular tissue, and was absent in the microvilli. Follicular cells from Hashimoto’s thyroiditis displayed TPO in the nuclear envelope and the scarce RER. Remarkably, oncocytic cells from both Hashimoto’s thyroiditis and oncocytic adenoma, typically packed with mitochondria, displayed evident TPO reaction exclusively in mitochondrial cristae. In Graves’ disease, the nuclear envelope, enlarged RER, and apical vesicles were strongly TPO positive, and microvilli also exhibited TPO activity. Papillary carcinoma cells were negative for TPO. The localization and characteristics of TPO activity in the H2O2 sites were similar to that of TPO in all tissues. MAO was positive in mitochondria of perinodular tissues, multinodular goiter, and oncocytes and negative in Hashimoto’s thyroiditis and Graves’ disease. Interestingly, MAO was intensely positive in the nuclear envelope of papillary carcinoma but unreactive in mitochondria. Biochemical TPO activity was increased in multinodular goiter and Graves’ disease. In conclusion, several changes in ultracytochemical characteristics of TPO, H2O2 sites, and MAO were associated with thyroid disease. Nonmalignant oncocytic cells exhibited an unusual mitochondrial location of TPO and H2O2 sites. The distribution of MAO in nuclear envelope of papillary carcinoma cells could be a further feature of malignancy." @default.
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• W2137888971 date "2004-04-01" @default.
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• W2137888971 title "Ultrastructural localization of thyroid peroxidase, hydrogen peroxide-generating sites, and monoamine oxidase in benign and malignant thyroid diseases" @default.
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• W2137888971 doi "https://doi.org/10.1016/j.humpath.2003.03.001" @default.
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