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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 Virology
2014 ; 462-463
(ä): 254-65
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Pneumolysin expression by streptococcus pneumoniae protects colonized mice from
influenza virus-induced disease
#MMPMID24999050
Wolf AI
; Strauman MC
; Mozdzanowska K
; Williams KL
; Osborne LC
; Shen H
; Liu Q
; Garlick D
; Artis D
; Hensley SE
; Caton AJ
; Weiser JN
; Erikson J
Virology
2014[Aug]; 462-463
(ä): 254-65
PMID24999050
show ga
The response to influenza virus (IAV) infection and severity of disease is highly
variable in humans. We hypothesized that one factor contributing to this
variability is the presence of specific respiratory tract (RT) microbes. One such
microbe is Streptococcus pneumoniae (Sp) that is carried asymptomatically in the
RT of many humans. In a mouse co-infection model we found that in contrast to
secondary bacterial infection that exacerbates disease, Sp colonization 10 days
prior to IAV protects from virus-induced morbidity and lung pathology. Using
mutant Sp strains, we identified a critical role for the bacterial virulence
factor pneumolysin (PLY) in mediating this protection. Colonization with the
PLY-sufficient Sp strain induces expression of the immune-suppressive enzyme
arginase 1 in alveolar macrophages (aMø) and correlates with attenuated
recruitment and function of pulmonary inflammatory cells. Our study demonstrates
a novel role for PLY in Sp-mediated protection by maintaining aMø as
"gatekeepers" against virus-induced immunopathology.
|Animals
[MESH]
|Bacterial Proteins/immunology/metabolism
[MESH]
|Disease Models, Animal
[MESH]
|Immunologic Factors/immunology/metabolism
[MESH]
|Lung/pathology
[MESH]
|Mice
[MESH]
|Mice, Inbred BALB C
[MESH]
|Orthomyxoviridae Infections/*immunology/prevention & control
[MESH]