Abstract
Bacillus anthracis, the causative agent of anthrax disease, is lethal owing to the actions of two exotoxins: anthrax lethal toxin (LT) and oedema toxin (ET). The key tissue targets responsible for the lethal effects of these toxins are unknown. Here we generated cell-type-specific anthrax toxin receptor capillary morphogenesis protein-2 (CMG2)-null mice and cell-type-specific CMG2-expressing mice and challenged them with the toxins. Our results show that lethality induced by LT and ET occurs through damage to distinct cell types; whereas targeting cardiomyocytes and vascular smooth muscle cells is required for LT-induced mortality, ET-induced lethality occurs mainly through its action in hepatocytes. Notably, and in contradiction to what has been previously postulated, targeting of endothelial cells by either toxin does not seem to contribute significantly to lethality. Our findings demonstrate that B. anthracis has evolved to use LT and ET to induce host lethality by coordinately damaging two distinct vital systems.
Publication types
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Research Support, N.I.H., Intramural
MeSH terms
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Animals
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Anthrax / genetics
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Anthrax / metabolism
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Anthrax / microbiology
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Antigens, Bacterial / toxicity*
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Bacillus anthracis / pathogenicity*
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Bacterial Toxins / toxicity*
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Disease Resistance / genetics
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Edema / chemically induced
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Endothelial Cells / drug effects
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Epithelial Cells / drug effects
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Epithelial Cells / pathology
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Female
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Hepatocytes / drug effects
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Hepatocytes / pathology
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Intestinal Mucosa / metabolism
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Intestines / drug effects
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Intestines / pathology
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Liver / cytology
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Liver / drug effects
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Liver / pathology
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Male
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Mice
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Mice, Transgenic
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Muscle, Smooth, Vascular / cytology
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Muscle, Smooth, Vascular / drug effects
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Muscle, Smooth, Vascular / pathology
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Myocytes, Cardiac / drug effects
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Myocytes, Cardiac / pathology
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Organ Specificity / drug effects
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Receptors, Peptide / deficiency
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Receptors, Peptide / genetics
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Receptors, Peptide / metabolism
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Substrate Specificity / drug effects
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Survival Analysis
Substances
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Antigens, Bacterial
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Antxr2 protein, mouse
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Bacterial Toxins
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Receptors, Peptide
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anthrax toxin