Journal
INTERNATIONAL JOURNAL OF MEDICAL MICROBIOLOGY
Volume 305, Issue 1, Pages 55-64Publisher
ELSEVIER GMBH
DOI: 10.1016/j.ijmm.2014.11.002
Keywords
Staphylococcus aureus; Bacteremia; Human monoclonal antibody; IsaA; Mouse; Efficacy
Categories
Funding
- Top Institute Pharma project [T4-213]
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Due to substantial therapy failure and the emergence of antibiotic-resistant Staphylococcus aureus strains, alternatives for antibiotic treatment of S. aureus infections are urgently needed. Passive immunization using S. aureus-specific monoclonal antibodies (mAb) could be such an alternative to prevent and treat severe S. aureus infections. The invariantly expressed immunodominant staphylococcal antigen A (IsaA) is a promising target for passive immunization. Here we report the development of the human anti-IsaA IgG1 mAb 1D9, which was shown to bind to all 26 S. aureus isolates tested. These included both methicillin-susceptible and methicillin-resistant S. aureus (MSSA and MRSA, respectively). Immune complexes consisting of IsaA and 1D9 stimulated human as well as murine neutrophils to generate an oxidative burst. In a murine bacteremia model, the prophylactic treatment with a single dose of 5 mg/kg 1D9 improved the survival of mice challenged with S. aureus isolate P (MSSA) significantly, while therapeutic treatment with the same dose did not influence animal survival. Neither prophylactic nor therapeutic treatment with 5 mg/kg 1D9 resulted in improved survival of mice with S. aureus USA300 (MRSA) bacteremia. Importantly, our studies show that healthyS. aureus carriers elicit an immune response which is sufficient to generate protective mAbs against invariant staphylococcal surface anti-. gens. Human mAb 1D9, possibly conjugated to for example another antibody, antibiotics, cytokines or chemokines, may be valuable to fight S. aureus infections in patients. (C) 2014 Elsevier GmbH. All rights reserved.
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