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Title: Inhibition of Toxic Shock by Human Monoclonal Antibodies against Staphylococcal Enterotoxin B

Abstract

Staphylococcus aureus is implicated in many opportunistic bacterial infections around the world. Rising antibiotic resistance and few alternative methods of treatment are just two looming problems associated with clinical management of S. aureus. Among numerous virulence factors produced by S. aureus, staphylococcal enterotoxin (SE) B is a secreted protein that binds T-cell receptor and major histocompatibility complex class II, potentially causing toxic shock mediated by pathological activation of T cells. Recombinant monoclonal antibodies that target SEB and block receptor interactions can be of therapeutic value. The inhibitory and biophysical properties of ten human monoclonal antibodies, isolated from a recombinant library by panning against SEB vaccine (STEBVax), were examined as bivalent Fabs and native full-length IgG (Mab). The best performing Fabs had binding affinities equal to polyclonal IgG, low nanomolar IC50s against SEB in cell culture assays, and protected mice from SEB-induced toxic shock. The orthologous staphylococcal proteins, SEC1 and SEC2, as well as streptococcal pyrogenic exotoxin C were recognized by several Fabs. Four Fabs against SEB, with the lowest IC50s, were converted into native full-length Mabs. Although SEB-binding kinetics were identical between each Fab and respective Mab, a 250-fold greater inhibition of SEB-induced T-cell activation was observed with two Mabs.more » Results suggest that these human monoclonal antibodies possess high affinity, target specificity, and toxin neutralization qualities essential for any therapeutic agent.« less

Authors:
 [1];  [2];  [1]
  1. Medical Research Institute of Infectious Diseases, Frederick, MD (United States); Hood College, Frederick, MD (United States)
  2. Medical Research Institute of Infectious Diseases, Frederick, MD (United States); Wilson College, Chambersburg, PA (United States)
Publication Date:
Research Org.:
Medical Research Institute of Infectious Diseases, Frederick, MD (United States); Hood College, Frederick, MD (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Medical Research and Materiel Command; Joint Science and Technology Office
OSTI Identifier:
1627427
Grant/Contract Number:  
SC0014664
Resource Type:
Accepted Manuscript
Journal Name:
PLoS ONE
Additional Journal Information:
Journal Volume: 5; Journal Issue: 10; Journal ID: ISSN 1932-6203
Publisher:
Public Library of Science
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; enzyme-linked immunoassays; antibodies; T cells; toxins; monoclonal antibodies; staphylococcus aureus; toxic shock syndrome; antibody therapy

Citation Formats

Larkin, Eileen A., Stiles, Bradley G., and Ulrich, Robert G. Inhibition of Toxic Shock by Human Monoclonal Antibodies against Staphylococcal Enterotoxin B. United States: N. p., 2010. Web. doi:10.1371/journal.pone.0013253.
Larkin, Eileen A., Stiles, Bradley G., & Ulrich, Robert G. Inhibition of Toxic Shock by Human Monoclonal Antibodies against Staphylococcal Enterotoxin B. United States. https://doi.org/10.1371/journal.pone.0013253
Larkin, Eileen A., Stiles, Bradley G., and Ulrich, Robert G. Mon . "Inhibition of Toxic Shock by Human Monoclonal Antibodies against Staphylococcal Enterotoxin B". United States. https://doi.org/10.1371/journal.pone.0013253. https://www.osti.gov/servlets/purl/1627427.
@article{osti_1627427,
title = {Inhibition of Toxic Shock by Human Monoclonal Antibodies against Staphylococcal Enterotoxin B},
author = {Larkin, Eileen A. and Stiles, Bradley G. and Ulrich, Robert G.},
abstractNote = {Staphylococcus aureus is implicated in many opportunistic bacterial infections around the world. Rising antibiotic resistance and few alternative methods of treatment are just two looming problems associated with clinical management of S. aureus. Among numerous virulence factors produced by S. aureus, staphylococcal enterotoxin (SE) B is a secreted protein that binds T-cell receptor and major histocompatibility complex class II, potentially causing toxic shock mediated by pathological activation of T cells. Recombinant monoclonal antibodies that target SEB and block receptor interactions can be of therapeutic value. The inhibitory and biophysical properties of ten human monoclonal antibodies, isolated from a recombinant library by panning against SEB vaccine (STEBVax), were examined as bivalent Fabs and native full-length IgG (Mab). The best performing Fabs had binding affinities equal to polyclonal IgG, low nanomolar IC50s against SEB in cell culture assays, and protected mice from SEB-induced toxic shock. The orthologous staphylococcal proteins, SEC1 and SEC2, as well as streptococcal pyrogenic exotoxin C were recognized by several Fabs. Four Fabs against SEB, with the lowest IC50s, were converted into native full-length Mabs. Although SEB-binding kinetics were identical between each Fab and respective Mab, a 250-fold greater inhibition of SEB-induced T-cell activation was observed with two Mabs. Results suggest that these human monoclonal antibodies possess high affinity, target specificity, and toxin neutralization qualities essential for any therapeutic agent.},
doi = {10.1371/journal.pone.0013253},
journal = {PLoS ONE},
number = 10,
volume = 5,
place = {United States},
year = {Mon Oct 11 00:00:00 EDT 2010},
month = {Mon Oct 11 00:00:00 EDT 2010}
}

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