Murine monoclonal antibodies reacting with lipopolysaccharide (LPS) of Salmonella minnesota strain R595 (Re chemotype) were prepared, and tested for their ability to protect actinomycin D-sensitized mice against lethal endotoxemia. Protection was found with some antibodies up to a 90-fold increase in LD50, whereas others exhibited no protection. The various protective antibodies did not all bind to the same epitope. The same applied for non-protective clones. Protective and non-protective clones could not be discriminated by ELISA. One protective monoclonal antibody (clone 20) was specific for ketodeoxyoctonate, a structural element common to various LPS. These findings show that the involvement of lipid A in the binding site of monoclonal antibodies is no prerequisite for protection. © 1988.
Appelmelk, B. J., Verweij-van Vught, A. M. J. J., Brade, H., Maaskant, J. J., Schouten, W. F., Thijs, L. G., & MacLaren, D. M. (1988). Prevention of lethal endotoxemia in actinomycin D-sensitized mice by incubation of Salmonella minnesota R595 lipopolysaccharide with monoclonal antibodies to R595. Microbial Pathogenesis, 5(4), 251–257. https://doi.org/10.1016/0882-4010(88)90097-6