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- W2469968216 abstract "Endotoxin, a bacterial lipopolysaccharide implicated in the pathogenesis of septic shock, markedly alters vascular permeability following intravenous injection in rabbits. We investigated the ability of murine monoclonal antibodies to confer protection against endotoxin-induced increases in a rabbit model of ocular vascular permeability. Four monoclonal antibodies of differing specificities as well as polymyxin B were compared for their effects on endotoxin from either Escherichia coli or Pseudomonas aeruginosa. Preincubation of endotoxin with antibodies directed against Pseudomonas O side chain or core glycolipid resulted in marked attenuation of vascular permeability due to Pseudomonas endotoxin, but not E. coli endotoxin. Antilipid A antibodies were not significantly effective in neutralizing either endotoxin with in vitro preincubation. Low avidity of the antilipid A antibody, low density of lipid A binding sites, or inaccessibility of the lipid A may have prevented more marked interactions. When administered intravenously prior to endotoxin challenge, none of the antibodies demonstrated the ability to provide specific protection to subsequent endotoxin in this model. They did provide partial nonspecific protection against endotoxins regardless of epitope specificity. When administered prophylactically, polymyxin B, an antibiotic that binds to lipid A, was highly effective in neutralizing the toxic effects of endotoxin. Since antibodies to lipid A reduce mortality in septic shock, the failure to demonstrate efficacy in this study may be due to the marked sensitivity of the rabbit eye to endotoxin. Alternatively, beneficial effects from antiendotoxin antibodies in septic shock may be unrelated to the inhibition of vascular permeability. Some protection from antiendotoxin antibodies may be due to enhancement of nonspecific mechanisms." @default.
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- W2469968216 date "1992-03-01" @default.
- W2469968216 modified "2023-09-26" @default.
- W2469968216 title "Reduction of endotoxin-induced vascular permeability by monoclonal antibodies against lipopolysaccharide determinants." @default.
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