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2016 ; 9
(5
): 1278-87
Nephropedia Template TP
gab.com Text
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Twit Text #
English Wikipedia
Aspirin-triggered resolvin D1 is produced during self-resolving gram-negative
bacterial pneumonia and regulates host immune responses for the resolution of
lung inflammation
#MMPMID26647716
Abdulnour RE
; Sham HP
; Douda DN
; Colas RA
; Dalli J
; Bai Y
; Ai X
; Serhan CN
; Levy BD
Mucosal Immunol
2016[Sep]; 9
(5
): 1278-87
PMID26647716
show ga
Bacterial pneumonia is a leading cause of morbidity and mortality worldwide. Host
responses to contain infection and mitigate pathogen-mediated lung inflammation
are critical for pneumonia resolution. Aspirin-triggered resolvin D1 (AT-RvD1;
7S,8R,17R-trihydroxy-4Z,9E,11E,13Z,15E,19Z-docosahexaenoic acid) is a lipid
mediator (LM) that displays organ-protective actions in sterile lung
inflammation, and regulates pathogen-initiated cellular responses. Here, in a
self-resolving murine model of Escherichia coli pneumonia, LM metabololipidomics
performed on lungs obtained at baseline, 24, and 72?h after infection uncovered
temporal regulation of endogenous AT-RvD1 production. Early treatment with
exogenous AT-RvD1 (1?h post infection) enhanced clearance of E. coli and
Pseudomonas aeruginosa in vivo, and lung macrophage phagocytosis of fluorescent
bacterial particles ex vivo. Characterization of macrophage subsets in the
alveolar compartment during pneumonia identified efferocytosis by infiltrating
macrophages (CD11b(Hi) CD11c(Low)) and exudative macrophages (CD11b(Hi)
CD11c(Hi)). AT-RvD1 increased efferocytosis by these cells ex vivo, and
accelerated neutrophil clearance during pneumonia in vivo. These anti-bacterial
and pro-resolving actions of AT-RvD1 were additive to antibiotic therapy. Taken
together, these findings suggest that the pro-resolving actions of AT-RvD1 during
pneumonia represent a novel host-directed therapeutic strategy to complement the
current antibiotic-centered approach for combatting infections.