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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Effect of active and passive immunizations with lipid A and salmonella minnesota Re 595 on gram-negative infections in mice.

The capacity of lipid A, a structure common to the lipopolysaccharide cores of all gram-negative bacteria, to serve as an active immunizing agent in mice and to protect these animals against gram-negative infections was investigated. Active immunization experiments were also performed with the Re mutant of Salmonella minnesota 595 which carries a lipopolysaccharide composed of lipid A and three residues of ketodeoxyoctonic acid. Single injections of lipid A complexed to acid-hydrolyzed bacteria as carriers failed to induce specific protection against subsequent challenge infections with E. coli O4 and S. breslau. Repeated injections of lipid A resulted in good protection against intraperitoneal challenge with S. breslau and partial protection against intravenous challenge with the same organism but did not alter the sensitivity of mice to challenge infections with E. coli or Pasteurella multocida. Whole antisera or serum fractions from rabbits in which high titers against lipid A had been attained by repeated intravenous injections of the antigen did not protect mice against challenge infections with E. coli O4. In contrast a single injection of the Re mutant of S. minnesota antigen in combination with incomplete Freund's adjuvant provided substantial protection against an otherwise lethal intraperitoneal infection with S. breslau over a period of at least 45 days. Repeated application of the Re antigen resulted in partial protection against experimental infections with E. coli O4, S. breslau and Pasteurella multocida. Injections of S. minnesota Re 595 antiserum provided better protection against an E. coli O4 infection than lipid A sera or antibodies of the IgG or IgM type directed against this antigen.[1]


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