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Demonstration of lipid A‐binding proteins on murine lymphoma cells using R‐mutant Gram‐negative bacteria as a detector

Some R‐mutant Escherichia coli and Salmonella heavily adhered to murine lymphoma cells of B cell and T cell lineages. This adhesion was primarily mediated by membrane‐localized proteins on tumor cells, which bind the polymyxin B‐reactive hydrophilic structure of lipis A on bacteria. SDS‐PAGE analysis of tumor cell membranes showed that proteins or glycoproteins of MW = around 45Kd, 25‐35Kd and around 15Kd preferentially bind lipid A. Various lymphoma cell lines binding the bacteria at different levels possessed lipid A‐binding proteins of slightly different compositions. We conclude that lymphoma cells carry not a single but a group of lipid A‐binding proteins in their membranes.