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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 PLoS+One
2013 ; 8
(5
): e64443
Nephropedia Template TP
gab.com Text
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English Wikipedia
Complement C5 activation during influenza A infection in mice contributes to
neutrophil recruitment and lung injury
#MMPMID23696894
Garcia CC
; Weston-Davies W
; Russo RC
; Tavares LP
; Rachid MA
; Alves-Filho JC
; Machado AV
; Ryffel B
; Nunn MA
; Teixeira MM
PLoS One
2013[]; 8
(5
): e64443
PMID23696894
show ga
Influenza virus A (IAV) causes annual epidemics and intermittent pandemics that
affect millions of people worldwide. Potent inflammatory responses are commonly
associated with severe cases of IAV infection. The complement system, an
important mechanism of innate and humoral immune responses to infections, is
activated during primary IAV infection and mediates, in association with natural
IgM, viral neutralization by virion aggregation and coating of viral
hemmagglutinin. Increased levels of the anaphylatoxin C5a were found in patients
fatally infected with the most recent H1N1 pandemic virus. In this study, our aim
was to evaluate whether targeting C5 activation alters inflammatory lung injury
and viral load in a murine model of IAV infection. To address this question
C57Bl/6j mice were infected intranasally with 10(4) PFU of the mouse adapted
Influenza A virus A/WSN/33 (H1N1) or inoculated with PBS (Mock). We demonstrated
that C5a is increased in bronchoalveolar lavage fluid (BALF) upon experimental
IAV infection. To evaluate the role of C5, we used OmCI, a potent
arthropod-derived inhibitor of C5 activation that binds to C5 and prevents
release of C5a by complement. OmCI was given daily by intraperitoneal injection
from the day of IAV infection until day 5. Treatment with OmCI only partially
reduced C5a levels in BALF. However, there was significant inhibition of
neutrophil and macrophage infiltration in the airways, Neutrophil Extracellular
Traps (NETs) formation, death of leukocytes, lung epithelial injury and overall
lung damage induced by the infection. There was no effect on viral load. Taken
together, these data suggest that targeting C5 activation with OmCI during IAV
infection could be a promising approach to reduce excessive inflammatory
reactions associated with the severe forms of IAV infections.
|Animals
[MESH]
|Complement C5/*metabolism
[MESH]
|Humans
[MESH]
|Influenza A virus/immunology/*pathogenicity
[MESH]