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Neutrophils isolated from BALB/c or C57BL/6 mice and treated in vitro with anthrax lethal toxin release bioactive neutrophil elastase, a proinflammatory mediator of tissue destruction. Similarly, neutrophils isolated from mice treated with anthrax lethal toxin in vivo and cultured ex vivo release greater amounts of elastase than neutrophils from vehicle-treated controls. Direct measurements from murine intestinal tissue samples demonstrate an anthrax lethal toxin-dependent increase in neutrophil elastase activity in vivo as well. These findings correlate with marked lethal toxin-induced intestinal ulceration and bleeding in neutrophil elastase(+/+) animals, but not in neutrophil elastase(-/-) animals. Moreover, neutrophil elastase(-/-) mice have a significant survival advantage over neutrophil elastase(+/+) animals following exposure to anthrax lethal toxin, thereby establishing a key role for neutrophil elastase in mediating the deleterious effects of anthrax lethal toxin.

Neutrophil Elastase Mediates Pathogenic Effects of Anthrax Lethal Toxin in the Murine Intestinal Tract