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The spontaneous release of a high-molecular-weight aggregate containing immunoglobulin G from the surface of Ehrlich ascites tumor cells by Harry G. Rittenhouse; Diane Ar; Matthew D. Lynn; David K. Denholm is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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## Abstract The spontaneous release of tumor cell antigens from the cell surface into the circulation has been proposed as a mechanism whereby tumors may escape the immune response of the host. In this study we have found that Ehrlich ascites tumor cells after removal from the host (mouse) spontaneously release significant amounts of cell surface components during incubation for 1 h in cold isotonic buffer. Immunodiffusion studies revealed that immunoglobulin G (IgG) and a complement component (C3) are included in this spontaneously released material. These surface‐bound humoral immune components are apparently released in the form of a high‐molecular‐weight aggregate (cell coat particle) as shown by ultracentrifugation and ultrafiltration experiments. Precipitation of IgG from the cell coat particle preparation with antibodies directed against mouse IgG followed by detergent gel electrophoresis of the immune precipitate revealed five major bands in addition to the heavy and light chains of IgG. These results suggest that host IgG is tightly bound to several other components at the cell surface, perhaps in the form of immune complexes. IgG is localized on the tumor cell surface in

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Author

Harry G. Rittenhouse; Diane Ar; Matthew D. Lynn; David K. Denholm

Publisher

Wiley (John Wiley & Sons); Alan R. Liss, Inc.; Wiley (ISSN 0091-7419)

Published

1978

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)