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American Journal of Pathology, Vol 130, 543-551, Copyright © 1988 by American Society for Investigative Pathology
REGULAR ARTICLES |
GM Taylor, HT Cook, EA Sheffield, C Hanson and WS Peart
Medical Unit, St. Mary's Hospital Medical School, Paddington, London, England.
The authors have used a sensitive alkaline phosphatase-anti-alkaline- phosphatase immunohistochemical method to examine 28 human pulmonary carcinomas for the presence of renin. Immunoreactive renin was found in 23 (82%) cases. Specific staining was always associated with small vessels in the stroma of the tumor or in adjacent areas of inflamed fibrous tissue. Within vessels, renin was localized in the cytoplasm of medial cells. Adenocarcinoma exhibited the most consistent staining (11/12 cases), and this appeared to be independent of the degree of tumor differentiation. Immunoreactive renin was also detected in squamous cell (7/8 cases), undifferentiated large cell (4/4 cases), and small cell undifferentiated carcinoma (1/1 cases), but the number of vessels and intensity of staining were usually less than seen in adenocarcinoma. Staining was not found in the bronchioloalveolar variant of adenocarcinoma (0/3 cases). By means of immunoaffinity chromatography with monoclonal antibodies (MAbs) raised to kidney renin, both active and inactive renin were extracted from homogenates of surgical specimens. The molecular weight of both forms of renin was approximately 59,000 daltons.
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