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

Journal Article · · PLoS ONE
 [1];  [2];  [3]
  1. Medical Research Institute of Infectious Diseases, Frederick, MD (United States); Hood College, Frederick, MD (United States); DOE/OSTI
  2. Medical Research Institute of Infectious Diseases, Frederick, MD (United States); Wilson College, Chambersburg, PA (United States)
  3. Medical Research Institute of Infectious Diseases, Frederick, MD (United States); Hood College, Frederick, MD (United States)
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.
Research Organization:
Hood College, Frederick, MD (United States); Medical Research Institute of Infectious Diseases, Frederick, MD (United States)
Sponsoring Organization:
Joint Science and Technology Office; Medical Research and Materiel Command; USDOE Office of Science (SC)
Grant/Contract Number:
SC0014664
OSTI ID:
1627427
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 10 Vol. 5; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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