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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+Virol
2011 ; 85
(14
): 6844-55
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Viral replication and innate host responses in primary human alveolar epithelial
cells and alveolar macrophages infected with influenza H5N1 and H1N1 viruses
#MMPMID21543489
Yu WC
; Chan RW
; Wang J
; Travanty EA
; Nicholls JM
; Peiris JS
; Mason RJ
; Chan MC
J Virol
2011[Jul]; 85
(14
): 6844-55
PMID21543489
show ga
Highly pathogenic influenza H5N1 virus continues to pose a threat to public
health. Although the mechanisms underlying the pathogenesis of the H5N1 virus
have not been fully defined, it has been suggested that cytokine dysregulation
plays an important role. As the human respiratory epithelium is the primary
target cell for influenza viruses, elucidating the viral tropism and innate
immune responses of influenza H5N1 virus in the alveolar epithelium may help us
to understand the pathogenesis of the severe pneumonia associated with H5N1
disease. Here we used primary cultures of differentiated human alveolar type II
cells, alveolar type I-like cells, and alveolar macrophages isolated from the
same individual to investigate viral replication competence and host innate
immune responses to influenza H5N1 (A/HK/483/97) and H1N1 (A/HK/54/98) virus
infection. The viral replication kinetics and cytokine and chemokine responses
were compared by quantitative PCR (qPCR) and enzyme-linked immunosorbent assay
(ELISA). We demonstrated that influenza H1N1 and H5N1 viruses replicated
productively in type II cells and type I-like cells although with different
kinetics. The H5N1 virus replicated productively in alveolar macrophages, whereas
the H1N1 virus led to an abortive infection. The H5N1 virus was a more potent
inducer of proinflammatory cytokines and chemokines than the H1N1 virus in all
cell types. However, higher levels of cytokine expression were observed for
peripheral blood monocyte-derived macrophages than for alveolar macrophages in
response to H5N1 virus infection. Our findings provide important insights into
the viral tropisms and host responses of different cell types found in the lung
and are relevant to an understanding of the pathogenesis of severe human
influenza disease.
|*Immunity, Innate
[MESH]
|*Virus Replication
[MESH]
|Cell Differentiation
[MESH]
|Cells, Cultured
[MESH]
|Enzyme-Linked Immunosorbent Assay
[MESH]
|Epithelial Cells/virology
[MESH]
|Humans
[MESH]
|Influenza A Virus, H1N1 Subtype/*physiology
[MESH]
|Influenza A Virus, H5N1 Subtype/*physiology
[MESH]