A Soluble Receptor Decoy Protects Rats against Anthrax Lethal Toxin Challenge
Author(s) -
Heather M. Scobie,
Diane Thomas,
John Marlett,
Giuseppe Destito,
Darran J. Wigelsworth,
R. John Collier,
John A. T. Young,
Marianne Manchester
Publication year - 2005
Publication title -
the journal of infectious diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.69
H-Index - 252
eISSN - 1537-6613
pISSN - 0022-1899
DOI - 10.1086/432731
Subject(s) - anthrax toxin , toxin , decoy , antitoxin , bacillus anthracis , microbiology and biotechnology , receptor , neutralization , biology , chemistry , immunology , fusion protein , bacteria , antibody , biochemistry , recombinant dna , genetics , gene
Successful postexposure treatment for inhalation anthrax is thought to include neutralization of anthrax toxin. The soluble anthrax toxin receptor/tumor endothelial marker 8 and capillary morphogenesis protein 2 (sATR/TEM8 and sCMG2, respectively) receptor decoys bind to anthrax toxin protective antigen (PA) and compete with cellular receptors for binding. Here, we show that, in a tissue-culture model of intoxication, sCMG2 is a 11.4-fold more potent antitoxin than sATR/TEM8 and that this increased activity corresponds to an approximately 1000-fold higher PA-binding affinity. Stoichiometric concentrations of sCMG2 protect rats against lethal toxin challenge, making sCMG2 one of the most effective anthrax antitoxins described to date.
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