Monoclonal antibodies targeting different cell wall antigens of group B streptococcus mediate protection in both Fc-dependent and independent manner

Abstract Group B streptococcus remains an important neonatal pathogen in spite of widely adopted intrapartum antibiotic administration; therefore immune prophylaxis for GBS infections is highly warranted. In passive immunization and lethal challenge studies with multiple GBS strains, we characterize...

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Veröffentlicht in:Vaccine 2011-05, Vol.29 (24), p.4116-4124
Hauptverfasser: Senn, Beatrice M, Visram, Zehra, Meinke, Andreas L, Neubauer, Christina, Gelbmann, Dieter, Sinzinger, Jan, Hanner, Markus, Lundberg, Urban, Boisvert, Heike, Reinscheid, Dieter, von Gabain, Alexander, Nagy, Eszter
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container_end_page 4124
container_issue 24
container_start_page 4116
container_title Vaccine
container_volume 29
creator Senn, Beatrice M
Visram, Zehra
Meinke, Andreas L
Neubauer, Christina
Gelbmann, Dieter
Sinzinger, Jan
Hanner, Markus
Lundberg, Urban
Boisvert, Heike
Reinscheid, Dieter
von Gabain, Alexander
Nagy, Eszter
description Abstract Group B streptococcus remains an important neonatal pathogen in spite of widely adopted intrapartum antibiotic administration; therefore immune prophylaxis for GBS infections is highly warranted. In passive immunization and lethal challenge studies with multiple GBS strains, we characterized the protective effect of rabbit polyclonal and murine monoclonal antibodies specific for four multi-functional cell wall anchored proteins, FbsA, BibA, PilA and PilB. Single specificity rabbit sera or mAbs induced high level, but strain dependent protection, while their combinations resulted in superior and broad efficacy against all GBS strains tested. Polyclonal and monoclonal antibodies specific for the pilus proteins exerted very potent opsonophagocytic killing activity in vitro and required the Fc domain for protection in vivo . In contrast, FbsA and BibA specific antibodies failed to show OPK activity, but their Fab fragments fully protected animals, suggesting that blocking the function of these proteins was the major mode of action. These data are supportive for developing immune prophylaxis with human mAbs for prematurely born neonates who receive low levels of antibodies by maternofetal transport and are characterized by not fully developed phagocytic and complement activity.
doi_str_mv 10.1016/j.vaccine.2011.03.100
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source MEDLINE; Elsevier ScienceDirect Journals
subjects Allergy and Immunology
Animals
Anti-infective monoclonal antibody
Antibiotics
Antibodies, Bacterial - administration & dosage
Antibodies, Bacterial - immunology
Antibodies, Monoclonal - administration & dosage
Antibodies, Monoclonal - immunology
antigens
Antigens, Bacterial - immunology
Applied microbiology
Bacteriology
Biological and medical sciences
Cell Wall - immunology
cell walls
complement
Disease
disease control
Disease Models, Animal
Female
fimbriae
Fundamental and applied biological sciences. Psychology
Group B streptococcus
humans
Immune prophylaxis
Immunization
Immunization, Passive - methods
Infections
mechanism of action
Mice
Microbiology
Miscellaneous
Mode of action
monoclonal antibodies
Mortality
Neonates
Older people
Pathogenesis
pathogens
Phagocytosis
Prophylaxis
Protected animals
Protective antigens
protective effect
Proteins
Rabbits
Streptococcal Infections - prevention & control
Streptococcus
Streptococcus agalactiae
Streptococcus agalactiae - immunology
Studies
Survival Analysis
Treatment Outcome
Vaccines
Vaccines, antisera, therapeutical immunoglobulins and monoclonal antibodies (general aspects)
Womens health
title Monoclonal antibodies targeting different cell wall antigens of group B streptococcus mediate protection in both Fc-dependent and independent manner
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