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. 1989 Feb;57(2):426–431. doi: 10.1128/iai.57.2.426-431.1989

Isolation, structure, and immunogenicity of Pseudomonas aeruginosa immunotype 4 high-molecular-weight polysaccharide.

G B Pier 1, M Pollack 1
PMCID: PMC313114  PMID: 2492260

Abstract

A high-molecular-weight, immunogenic form of the lipopolysaccharide O side chain of Pseudomonas aeruginosa Fisher immunotype 4 (type 4, International Antigenic Typing System 1, Lanyi O:6) was isolated and characterized. Analysis by nuclear magnetic resonance spectroscopy confirmed the structural similarity of this high-molecular-weight polysaccharide and the type 4 O side chain. The polysaccharide was immunogenic in rabbits and mice, eliciting opsonophagocytic killing antibodies. Immunization with the polysaccharide produced significant protection against homologous challenge in both burned and granulocytopenic mice. Naturally acquired opsonic killing antibodies to type 4 polysaccharide were present in sera from unimmunized normal adults at levels comparable to postimmunization levels achieved after immunization with other type-specific polysaccharides. The specificity of the naturally occurring antibodies for the O side chain was documented by immunoblot analysis and inhibition studies. Naturally occurring polysaccharide-specific antibodies were comparable in their protective activity against live challenge in neutropenic animals to immunization-induced murine antibodies with similar specificity. These data suggest that naturally occurring serum antibody to P. aeruginosa type 4 lipopolysaccharide O side chains in most adults is not distinguishable in quantity or quality from immunization-induced antibodies in mice; evaluation of type 4-specific vaccines in humans may be complicated by this finding.

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Selected References

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