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. 1988 Mar;32(3):364–368. doi: 10.1128/aac.32.3.364

Influence of cephalosporins and iron on surface protein antigens of Klebsiella pneumoniae in vivo.

J L Kadurugamuwa 1, H Anwar 1, M R Brown 1, B Hengstler 1, S Kunz 1, O Zak 1
PMCID: PMC172177  PMID: 3284461

Abstract

The outer membrane protein (OMP) profiles of Klebsiella pneumoniae grown in a rabbit peritonitis model in the presence or absence of cephalosporins were investigated. Six high-molecular-weight OMPs (Mr 69,000 to 83,000) were induced under iron-depleted conditions in vitro. Three of these proteins (the 69,000-Mr protein [69K protein] and the 70K and 78K proteins) and trace amounts of the 73K and 75K proteins were induced in the OM of bacteria infecting the peritoneal cavity of rabbits. Addition of iron either to the growth medium in vitro or to the peritoneum in vivo repressed the expression of these proteins. Cephaloridine had no significant effect on the OMP profiles. An additional 56,000-Mr protein was observed in the OM of bacteria cultivated in vivo in the presence of CGP 17520 and also to a lesser extent in vivo under conditions of iron excess. A difference in recognition of OM antigens between cells grown in vitro and in vivo was observed by immunoblotting techniques. The 26K, 27.5K, and 28.5K antigens present in the OM of cells grown in vitro (but not in vivo) were recognized by antibodies raised against bacteria cultivated in vitro under conditions of iron depletion, but were not recognized by antisera raised against bacteria harvested directly from infections. Antisera raised against a nonencapsulated K. pneumoniae strain caused no agglutination of encapsulated K. pneumoniae grown in vivo in the absence of cephalosporins. Rapid agglutination was observed with this antiserum when the same encapsulated strain was grown in vivo in the presence of either cephalosporin, indicating less occlusion of critical antigens by the capsule.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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