Summary
A monoclonal antibody (BM8) raised in the rat against cultured mouse bone marrow-derived macrophages reacted only with macrophages and not with granulocytes, mast cells, platelets, lymphocytes, fibroblasts, and endothelial cells. BM8 did not detect blood monocytes. In cultured bone-marrow cells, expression of BM8-antigen was found on a few macrophages after one day of culture and reached its maximum level with 80% positive macrophages after 7–10 days of culture. The antibody BM8 belonged to the IgG2a subclass, was non-cytotoxic and directed against a 125 kD membrane antigen. In cryostat sections of normal mouse tissues (spleen, lymph node, thymus, liver, skin) BM8 detected tissue-fixed macrophages and Langerhans cells in the skin. In spleen and lymph node, BM8 reacted with macrophages in the red pulp and in the medullary cords, respectively, but not with heavily phagocytosing marginal-zone macrophages, as revealed by in-vivo phagocytosis of colloidal carbon. In granulomata induced by complete Freund's adjuvant, BM8 detected inflammatory macrophages but not epithelioid cells. Thus, antibody BM8 detected a differentiation antigen expressed only on mature, tissue-fixed macrophages.
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Malorny, U., Michels, E. & Sorg, C. A monoclonal antibody against an antigen present on mouse macrophages and absent from monocytes. Cell Tissue Res. 243, 421–428 (1986). https://doi.org/10.1007/BF00251059
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DOI: https://doi.org/10.1007/BF00251059