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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.

Evaluation of protection by two endotoxin-neutralizing IgM monoclonal antibodies in different peritonitis models