Anterior Pituitary Cell Antibodies Detected in Hashimoto's Thyroiditis and Graves' disease.

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Abstract
An immunofluorescence study using unfixed cryostat sections of rat pituitary glands was carried out on sera from 34 patients with Hashimoto's thyroiditis, 28 patients with Graves' disease, 10 patients with thyroid adenoma and 50 healthy subjects. After absorption of sera with rat liver tissues, 19 of 34 patients retained reactivity to anterior pituitary cell antibodies (PCA, 55.8%). On the other hand, immunofluorescence in anterior pituitary cells was faint and detected in only 2 of 28 patients with Graves' disease (7.1%) after absorption of their sera with rat liver aceton powder. A similar result was also obtained when PCA were compared in the sera of Hashimoto's thyroiditis and Graves' disease with high titers of thyroid microsomal autoantibodies. PCA were detected neither in the sera of patients with thyroid adenoma nor in the healthy subjects. The present study suggests that PCA were considerably more prevalent in Hashimoto's thyroiditis than in Graves' disease.

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