Journal of Antimicrobial Chemotherapy, Vol 40, 567-572, Copyright © 1997 by The British Society for Antimicrobial Chemotherapy
WN Hustinx, BJ Benaissa-Trouw, T Harmsen, S Klein, J Verhoef, AI Hoepelman and K Kraaijeveld
Two anti-core glycolipid (CGL) IgM monoclonal antibodies (mAbs 8-2 and
26-20), previously shown to display cross-reactivity with heterologous
lipopolysaccharide (LPS) in vitro and to provide cross-protectivity against
endotoxin challenge in vivo, were evaluated for their potential to protect
mice against death from peritonitis caused by heterologous bacterial
challenge. Without concurrent antibiotic treatment neither antibody was
protective. Compared with a control mAb, prophylactic treatment with mAb
8-2 significantly increased the survival of gentamicin-treated mice
challenged with the rough strain Salmonella minnesota Re595. Both mAb 8-2
and a control mAb, in combination with a suboptimal dose of ceftazidime,
increased survival following challenge with the clinical isolate
Escherichia coli O7:K1. In a model of mucin- enhanced peritonitis, neither
mAb was protective against challenge with inocula of E. coli O7:K1, ranging
from 10(2) to 10(4) bacteria. We conclude that protection of mice by
anti-CGL mAb 8-2 against heterologous challenge is vitally dependent on
concurrent treatment with antibiotics and that protection may not be
attributable to the anti-CGL specificity of these antibodies.
ORIGINAL ARTICLES
Evaluation of protection by two endotoxin-neutralizing IgM monoclonal antibodies in different peritonitis models
Eijkman-Winkler Institute for Medical & Clinical Microbiology, Utrecht University Hospital, The Netherlands.
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