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- W2112672023 abstract "To study the mechanisms of protection against endotoxin challenge offered by antisera to smooth and rough gram-negative organisms, we have developed an assay to quantitate endotoxin neutralization based on inhibition of the Limulus amoebocyte lysate test. Dilutions of different bacterial lipopolysaccharides (LPSs) were incubated with hyperimmune rabbit sera against Escherichia coli O113, E. coli O18, and rough mutants E. coli J5 and Salmonella minnesota Re595 and were then combined with limulus lysate. The gelation reaction induced by LPS in the lysate was monitored spectrophotometrically, and the concentration of LPS resulting in a 50% lysate response was determined and correlated with antibody titers measured by enzyme-linked immunosorbent assay. Antisera to smooth organisms neutralized homologous LPS markedly and heterologous LPSs only minimally relative to neutralization by preimmune serum. Neutralization of homologous LPS occurred immediately without preincubation of serum and LPS. Antisera to rough mutants neutralized more heterologous LPS than did antisera to smooth organisms. However, this heterologous neutralization required preincubation of serum and LPS and did not appear to be correlated with antibody concentrations. We conclude that antisera to LPS rapidly neutralize the biological activity of the homologous LPS, as detected by limulus lysate, and that neutralization is at least in part antibody mediated. Antisera to rough-mutant organisms slowly neutralized the activity of heterologous LPSs, but this effect appeared not to be correlated with concentrations of antibody to the LPS of the rough mutant, as measured by enzyme-linked immunosorbent assay." @default.
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- W2112672023 date "1987-07-01" @default.
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- W2112672023 title "Endotoxin neutralization with rabbit antisera to Escherichia coli J5 and other gram-negative bacteria" @default.
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- W2112672023 doi "https://doi.org/10.1128/iai.55.7.1668-1673.1987" @default.
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