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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Pathol
2014 ; 184
(12
): 3205-16
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English Wikipedia
Lethal factor, but not edema factor, is required to cause fatal anthrax in
cynomolgus macaques after pulmonary spore challenge
#MMPMID25285720
Hutt JA
; Lovchik JA
; Drysdale M
; Sherwood RL
; Brasel T
; Lipscomb MF
; Lyons CR
Am J Pathol
2014[Dec]; 184
(12
): 3205-16
PMID25285720
show ga
Inhalational anthrax is caused by inhalation of Bacillus anthracis spores. The
ability of B. anthracis to cause anthrax is attributed to the plasmid-encoded
A/B-type toxins, edema toxin (edema factor and protective antigen) and lethal
toxin (lethal factor and protective antigen), and a poly-d-glutamic acid capsule.
To better understand the contribution of these toxins to the disease
pathophysiology in vivo, we used B. anthracis Ames strain and isogenic toxin
deletion mutants derived from the Ames strain to examine the role of lethal toxin
and edema toxin after pulmonary spore challenge of cynomolgus macaques. Lethal
toxin, but not edema toxin, was required to induce sustained bacteremia and death
after pulmonary challenge with spores delivered via bronchoscopy. After
intravenous challenge with bacilli to model the systemic phase of infection,
lethal toxin contributed to bacterial proliferation and subsequent host death to
a greater extent than edema toxin. Deletion of protective antigen resulted in
greater loss of virulence after intravenous challenge with bacilli than deletion
of lethal toxin or edema toxin alone. These findings are consistent with the
ability of anti-protective antigen antibodies to prevent anthrax and suggest that
lethal factor is the dominant toxin that contributes to the escape of significant
numbers of bacilli from the thoracic cavity to cause anthrax after inhalation
challenge with spores.