title: Antigenic crossreactivity and lipopolysaccharide neutralization properties of bovine immunoglobulin G.
abstract: We investigated a possible mechanism by which immunization against core and lipid A determinants of lipopolysaccharide reduced clinical cases of mastitis and symptoms commonly associated with heterologous Gram-negative IMI. The IgG fraction of sera from cows immunized with either Escherichia coli J5 bacterin, E. coli J5 lipopolysaccharide conjugate vaccine, or unimmunized controls was purified by precipitation with caprylic acid and ammonium sulfate. The degree of IgG crossreactivity with Gram-negative bacteria that were isolated from clinical quarters was greater than that with Gram-positive isolates of Staphylococcus aureus. The highest magnitude of crossreactivity was against smooth strain E. coli isolates, followed by heterologous species of Enterobacter, Serratia, and Klebsiella isolates. Serum IgG from cows immunized with conjugate was highly crossreactive to E. coli J5, E. coli O111:B4, Serratia marcescens, Klebsiella pneumoniae, and Salmonella typhimurium lipopolysaccharides. The magnitude of antibody crossreactivity with lipopolysaccharides coincided with the ability of IgG to suppress the mitogenic effect of lipopolysaccharides on bovine lymphocytes.
authors.affiliation: Department of Animal Science, Ohio State University, Wooster, USA.
authors.forename: G M
authors.initials: GM
authors.lastname: Tomita
authors.forename: D A
authors.initials: DA
authors.lastname: Todhunter
authors.forename: J S
authors.initials: JS
authors.lastname: Hogan
authors.forename: K L
authors.initials: KL
authors.lastname: Smith
mesh_terms: D000645:Ammonium Sulfate; D000818:Animals; D000918:Antibody Specificity; D000942:Antigens, Bacterial / Q000276:immunology*; D001428:Bacterial Vaccines / Q000276:immunology; D002210:Caprylates; D002417:Cattle / Q000276:immunology*; D011232:Chemical Precipitation; D004754:Enterobacter / Q000276:immunology; D004926:Escherichia coli / Q000276:immunology; D005260:Female; D007114:Immunization; D007074:Immunoglobulin G / Q000276:immunology*; D007709:Klebsiella / Q000276:immunology; D008050:Lipid A / Q000276:immunology; D008070:Lipopolysaccharides / Q000276:immunology*; D008414:Mastitis, Bovine / Q000517:prevention & control; D012705:Serratia / Q000276:immunology
chemical_list: D000942:Antigens, Bacterial; D001428:Bacterial Vaccines; D002210:Caprylates; D007074:Immunoglobulin G; D008050:Lipid A; D008070:Lipopolysaccharides; C031492:octanoic acid; D000645:Ammonium Sulfate