Abstract
Occludin is a tight-junction-associated transmembrane protein, and previous observations suggested that occludin might play a crucial role in the formation and maintenance of organized tubular structures. Based on these observations, we explored the possible role of occludin immunostaining in the diagnosis of lung carcinomas. A total of 68 lung carcinomas and surrounding normal lung tissues were studied. A formalin-fixed, paraffin-embedded section from each tumor was stained with a new anti-occludin monoclonal antibody raised in our laboratory. In normal lung tissues, the anti-occludin antibody strongly stained the apicoluminal borders of the bronchial/bronchiolar epithelia and bronchial glands as a dot or short line. The antibody also stained the intercellular borders of alveolar epithelia. In cancer cells that faced lumina of all adenocarcinomas, regardless of grade, including bronchioloalveolar carcinomas, occludin showed an expression pattern identical to that of the normal bronchial and alveolar epithelia. Occludin reactivity was not noted in any cases of squamous cell carcinoma, large cell carcinoma, small cell carcinoma, or large cell neuroendocrine carcinoma. The results of the present study suggest that occludin can se...Continue Reading
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