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2014 ; 82
(10
): 4325-36
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gab.com Text
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English Wikipedia
Alveolar macrophages and neutrophils are the primary reservoirs for Legionella
pneumophila and mediate cytosolic surveillance of type IV secretion
#MMPMID25092908
Copenhaver AM
; Casson CN
; Nguyen HT
; Fung TC
; Duda MM
; Roy CR
; Shin S
Infect Immun
2014[Oct]; 82
(10
): 4325-36
PMID25092908
show ga
Legionella pneumophila, an intracellular pathogen responsible for the severe
pneumonia Legionnaires' disease, uses its dot/icm-encoded type IV secretion
system (T4SS) to translocate effector proteins that promote its survival and
replication into the host cell cytosol. However, by introducing bacterial
products into the host cytosol, L. pneumophila also activates cytosolic
immunosurveillance pathways, thereby triggering robust proinflammatory responses
that mediate the control of infection. Thus, the pulmonary cell types that L.
pneumophila infects not only may act as an intracellular niche that facilitates
its pathogenesis but also may contribute to the immune response against L.
pneumophila. The identity of these host cells remains poorly understood. Here, we
developed a strain of L. pneumophila producing a fusion protein consisting of
?-lactamase fused to the T4SS-translocated effector RalF, which allowed us to
track cells injected by the T4SS. Our data reveal that alveolar macrophages and
neutrophils both are the primary recipients of T4SS-translocated effectors and
harbor viable L. pneumophila during pulmonary infection of mice. Moreover, both
alveolar macrophages and neutrophils from infected mice produced tumor necrosis
factor and interleukin-1? in response to T4SS-sufficient, but not T4SS-deficient,
L. pneumophila. Collectively, our data suggest that alveolar macrophages and
neutrophils are both an intracellular reservoir for L. pneumophila and a source
of proinflammatory cytokines that contribute to the host immune response against
L. pneumophila during pulmonary infection.