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2015 ; 17
(4
): 429-40
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Autophagy mediates tolerance to Staphylococcus aureus alpha-toxin
#MMPMID25816775
Maurer K
; Reyes-Robles T
; Alonzo F 3rd
; Durbin J
; Torres VJ
; Cadwell K
Cell Host Microbe
2015[Apr]; 17
(4
): 429-40
PMID25816775
show ga
Resistance and tolerance are two defense strategies employed by the host against
microbial threats. Autophagy-mediated degradation of bacteria has been
extensively described as a major resistance mechanism. Here we find that the
dominant function of autophagy proteins during infections with the epidemic
community-associated methicillin-resistant Staphylococcus aureus USA300 is to
mediate tolerance rather than resistance. Atg16L1 hypomorphic mice (Atg16L1(HM)),
which have reduced autophagy, were highly susceptible to lethality in both sepsis
and pneumonia models of USA300 infection. Autophagy confers protection by
limiting the damage caused by ?-toxin, particularly to endothelial cells.
Remarkably, Atg16L1(HM) mice display enhanced survival rather than susceptibility
upon infection with ?-toxin-deficient S. aureus. These results identify an
essential role for autophagy in tolerance to Staphylococcal disease and highlight
how a single virulence factor encoded by a pathogen can determine whether a given
host factor promotes tolerance or resistance.