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The Journal of Immunology, Vol 138, Issue 12 4329-4335, Copyright © 1987 by American Association of Immunologists
ARTICLES |
U Bethke, B Kniep and PF Muhlradt
Three hybridoma clones were isolated after hybridization of a mouse myeloma line with splenocytes from rats immunized with Forssman glycosphingolipid (Fo). Two of these clones produced Fo-specific monoclonal antibodies (MAB) of the IgM class, one MAB of the IgG2c class. In complement-dependent depletion experiments and immunofluorescence studies on the nature of Fo-positive leukocytes in CBA/J mice the following results were obtained: whereas blood monocytes, polymorphonuclear leukocytes, and lymphocytes were Fo negative, 5 to 10% of suspended spleen cells were positive. The majority of these were macrophage-like, glass- and nylon-adherent, nonspecific esterase-positive phagocytizing cells carrying Ia and globoside markers. These cells participated as accessory cells in the mixed lymphocyte culture reaction. In cell suspensions from axillary and inguinal lymph nodes, 2% were Fo positive. They were enriched up to 70% in the glass-adherent, esterase-positive population from this source. In contrast, no Fo-positive cells were detected in mesenteric lymph nodes, and less than 0.1% of the resident peritoneal macrophages bore this marker. The percentage of Fo-positive cells increased to 1% in thioglycollate-elicited peritoneal cells. Immunostaining of cryosections of lung and liver tissue showed alveolar macrophages and Kupffer cells, respectively, to be Fo negative.
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