Antibacterial Properties ofPseudomonas aeruginosaImmunotype 1 Lipopolysaccharide-Specific Monoclonal Antibody (MAb) in a Murine Thigh Infection Model: Combined Effects of MAb and Ceftazidime
| Autor: | Mark H. Pollack, Kazunori Oishi, Misao Tao, Moritoshi Akiyama, Keizo Matsumoto |
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| Rok vydání: | 2000 |
| Předmět: |
Lipopolysaccharides
Lipopolysaccharide Neutrophils medicine.drug_class Immunology Antibiotics Immunoglobulins Ceftazidime Biology medicine.disease_cause Monoclonal antibody Microbiology Mice chemistry.chemical_compound Phagocytosis In vivo Virology medicine Animals Humans Pseudomonas Infections Pseudomonas aeruginosa Antibodies Monoclonal Combined Modality Therapy In vitro Cephalosporins Disease Models Animal Thigh chemistry Immunoglobulin G biology.protein Female Antibody medicine.drug |
| Zdroj: | Microbiology and Immunology. 44:629-635 |
| ISSN: | 0385-5600 |
| DOI: | 10.1111/j.1348-0421.2000.tb02543.x |
| Popis: | A murine monoclonal antibody (MAb) specific for the Pseudomonas aeruginosa immunotype 1 (It-1) lipopolysaccharide (LPS) O-side chain was evaluated in terms of its in vitro bactericidal opsonophagocytic activity and in vivo bacterial killing in a mouse thigh infection model. An immunoglobulin (Ig) G2a MAb Ld3-2F2, specific for It-1 LPS, mediated in vitro complement-dependent opsonophagocytic killing at a concentration of 10 microg/ml. MAb-mediated, complement-dependent killing also occurred in the absence of neutrophils at serum concentrations in excess of 20%. A remarkable synergy was observed in opsonophagocytic assays between MAb Ld3-2F2 (0.5 microg/ml) and ceftazidime (1/4 MIC). The administration of MAb Ld3-2F2 at a level of 1 microg resulted in a significant decrease in the number of bacteria in the thigh muscles of normal mice, while 100 microg of the same MAb was required for one log of reduction in the number of bacteria at the same site in neutropenic mice. The combined therapy with MAb Ld3-2F2 and ceftazidime provided a significant reduction in the density of bacteria in the thigh muscle at 9 hr post-infection in normal and neutropenic mice as compared with those after treatment alone or with no treatment (P0.01). These favorable in vitro and in vivo interactions of an LPS-specific IgG MAb and ceftazidime strongly support their potential for use in therapy, combined with an LPS-reactive MAb and parenteral antipseudomonas beta-lactam antibiotics in the therapy of systemic Pseudomonas infections in normal and neutropenic hosts. |
| Databáze: | OpenAIRE |
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