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Analysis of Mononuclear Cell Surfaces with Fluoresceinated Staphylococcal Protein A Complexed with IgG Antibody or Heat-Aggregated -Globulin

From the Biological Products, Parasitology and Virology Divisions, Bureau of Laboratories, Center for Disease Control, United States Department of Health, Education and Welfare, Atlanta, Georgia 30333 and the Department of Pathology, Emory University School of Medicine, Atlanta, Georgia 30303

Abstract

Fluorescein-conjugated staphylococcal protein A (SPA) was complexed with either: 1) heat-aggregated IgG, 2) B cell specific antibody, or 3) T cell specific antibody and then used for an immunofluorescent analysis of mononuclear cell surfaces. Cellular Fc receptors failed to recognize the Fc region of aggregated IgG that had been blocked by SPA. Moreover, fluoresceinated SPA that had been complexed either with anti-Fab (B-cell specific) or T cell-specific antisera prevented the nonspecific binding of these reagents to the IgG-Fc receptors on mononuclear cells, thereby permitting the latter to be properly identified as B or T lymphocytes. In addition, when unconjugated SPA was added to presensitized target cells in a test for antibody-dependent cell-mediated cytotoxicity, cytolysis was abrogated.

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