Abstract
The human Class II major histocompatibility (MHC) antigens, or Ia antigens, which are thought to regulate immune cell interaction, can be detected in paraffin-embedded tissues by immunoperoxidase staining with a recently developed monoclonal antibody (LK8D3). HLA-DR antigens were observed in lymphoid tissues, Langerhans cells of the skin, some epithelial cells, and pulmonary alveolar macrophages. The expression of HLA-DR antigens was analyzed in formalin-paraffin sections by immunoperoxidase in 86 normal and abnormal thyroid epithelial tissues. All patients with Hashimoto's disease (8/8) and most patients with Graves' disease (6/8) expressed HLA/DR antigens in the thyroid epithelial cells and in adjacent inflammatory cells. Most papillary carcinomas (12/18), including 3 of 5 follicular variant of papillary thyroid carcinomas, had HLA-DR antigens detected in epithelial cells; whereas medullary thyroid carcinomas (0/5), follicular carcinomas (0/5), and multinodular goiters (0/4) did not have detectable HLA-DR immunoreactivity. A few other thyroid lesions had HLA-DR antigens detected in epithelial cells, including anaplastic carcinomas (2/5), Hurthle-cell tumors (1/16), and thyroid lymphomas (2/2). Monoclonal antibody LK8D3 and two other commercially available monoclonal antibodies against HLA-DR-stained tissues equally well in cryostat sections, but only antibody LK8D3 was effective in formalin-fixed paraffin-embedded tissue sections. These results indicate that epithelial cells from thyroids of patients with autoimmune diseases commonly express HLA-DR antigens. The presence of HLA-DR antigens in most papillary thyroid carcinomas may be helpful diagnostically in cases of follicular variants of papillary carcinomas. The role of HLA-DR expression in autoimmune thyroid disease and in papillary thyroid carcinoma remains to be determined.
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