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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+Pathog
2011 ; 7
(6
): e1002099
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Highly pathogenic avian influenza virus H5N1 infects alveolar macrophages without
virus production or excessive TNF-alpha induction
#MMPMID21731493
van Riel D
; Leijten LM
; van der Eerden M
; Hoogsteden HC
; Boven LA
; Lambrecht BN
; Osterhaus AD
; Kuiken T
PLoS Pathog
2011[Jun]; 7
(6
): e1002099
PMID21731493
show ga
Highly pathogenic avian influenza virus (HPAIV) of the subtype H5N1 causes
severe, often fatal pneumonia in humans. The pathogenesis of HPAIV H5N1 infection
is not completely understood, although the alveolar macrophage (AM) is thought to
play an important role. HPAIV H5N1 infection of macrophages cultured from
monocytes leads to high percentages of infection accompanied by virus production
and an excessive pro-inflammatory immune response. However, macrophages cultured
from monocytes are different from AM, both in phenotype and in response to
seasonal influenza virus infection. Consequently, it remains unclear whether the
results of studies with macrophages cultured from monocytes are valid for AM.
Therefore we infected AM and for comparison macrophages cultured from monocytes
with seasonal H3N2 virus, HPAIV H5N1 or pandemic H1N1 virus, and determined the
percentage of cells infected, virus production and induction of TNF-alpha, a
pro-inflammatory cytokine. In vitro HPAIV H5N1 infection of AM compared to that
of macrophages cultured from monocytes resulted in a lower percentage of infected
cells (up to 25% vs up to 84%), lower virus production and lower TNF-alpha
induction. In vitro infection of AM with H3N2 or H1N1 virus resulted in even
lower percentages of infected cells (up to 7%) than with HPAIV H5N1, while virus
production and TNF-alpha induction were comparable. In conclusion, this study
reveals that macrophages cultured from monocytes are not a good model to study
the interaction between AM and these influenza virus strains. Furthermore, the
interaction between HPAIV H5N1 and AM could contribute to the pathogenicity of
this virus in humans, due to the relative high percentage of infected cells
rather than virus production or an excessive TNF-alpha induction.
|*Virus Replication
[MESH]
|Cells, Cultured
[MESH]
|Humans
[MESH]
|Influenza A Virus, H1N1 Subtype
[MESH]
|Influenza A Virus, H3N2 Subtype
[MESH]
|Influenza A Virus, H5N1 Subtype/*pathogenicity
[MESH]