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Heterogeneity of rat macrophages recognized by monoclonal antibodies: an immunohistochemical and immunoelectron microscopic study

M Takeya, L Hsiao, Y Shimokawa and K Takahashi

Second Department of Pathology, Kumamoto University Medical School, Japan.

Three monoclonal antibodies, designated RM-1, TRPM-1, and TRPM-2, were raised against rat peritoneal macrophages. By the immunoperoxidase method, antigens recognized by these antibodies were distributed throughout most tissue and free macrophages examined, including those of splenic red pulp, lymphatic sinus, connective tissue, and peritoneal cavity, as well as Kupffer cells of liver and alveolar macrophages. The numbers of positive cells were different for each antibody. RM-1 and TRPM-1 were also reactive with interdigitating cells (IDCs) in the thymus-dependent area and with Langerhans cells in the skin, whereas TRPM-2 failed to demonstrate IDCs in thymic medulla and Langerhans cells. The reactions of each antibody were observed by immunoelectron microscopy in the different ultrastructural compartments of the cells. RM-1 recognized a cell surface antigen; reaction products for TRPM-1 were found on a part of the cell membrane and in the cytoplasmic vacuoles; and those of TRPM-2 were present along the nuclear envelope and intracytoplasmic vacuoles. These antibodies seem to be useful not only for the detection of macrophages in tissue sections but also for investigation of macrophage heterogeneity in different tissues.

Volume 37, Issue 5, pp. 635-641, 05/01/1989
Copyright © 1989 by The Histochemical Society


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