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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 J+Immunol
2015 ; 194
(12
): 6024-34
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Regulation of neutrophilic inflammation by proteinase-activated receptor 1 during
bacterial pulmonary infection
#MMPMID25948816
José RJ
; Williams AE
; Mercer PF
; Sulikowski MG
; Brown JS
; Chambers RC
J Immunol
2015[Jun]; 194
(12
): 6024-34
PMID25948816
show ga
Neutrophils are key effector cells of the innate immune response to pathogenic
bacteria, but excessive neutrophilic inflammation can be associated with
bystander tissue damage. The mechanisms responsible for neutrophil recruitment to
the lungs during bacterial pneumonia are poorly defined. In this study, we focus
on the potential role of the major high-affinity thrombin receptor,
proteinase-activated receptor 1 (PAR-1), during the development of pneumonia to
the common lung pathogen Streptococcus pneumoniae. Our studies demonstrate that
neutrophils were indispensable for controlling S. pneumoniae outgrowth but
contributed to alveolar barrier disruption. We further report that intra-alveolar
coagulation (bronchoalveolar lavage fluid thrombin-antithrombin complex levels)
and PAR-1 immunostaining were increased in this model of bacterial lung
infection. Functional studies using the most clinically advanced PAR-1
antagonist, SCH530348, revealed a key contribution for PAR-1 signaling in
influencing neutrophil recruitment to lung airspaces in response to both an
invasive and noninvasive strain of S. pneumoniae (D39 and EF3030) but that PAR-1
antagonism did not impair the ability of the host to control bacterial outgrowth.
PAR-1 antagonist treatment significantly decreased pulmonary levels of IL-1?,
CXCL1, CCL2, and CCL7 and attenuated alveolar leak. Ab neutralization studies
further demonstrated a nonredundant role for IL-1?, CXCL1, and CCL7 in mediating
neutrophil recruitment in response to S. pneumoniae infection. Taken together,
these data demonstrate a key role for PAR-1 during S. pneumoniae lung infection
that is mediated, at least in part, by influencing multiple downstream
inflammatory mediators.