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2013 ; 207
(2
): 262-71
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Differences in cytokine production in human macrophages and in virulence in mice
are attributable to the acidic polymerase protein of highly pathogenic influenza
A virus subtype H5N1
#MMPMID23042757
Sakabe S
; Takano R
; Nagamura-Inoue T
; Yamashita N
; Nidom CA
; Quynh Le Mt
; Iwatsuki-Horimoto K
; Kawaoka Y
J Infect Dis
2013[Jan]; 207
(2
): 262-71
PMID23042757
show ga
BACKGROUND: The pathogenesis of influenza A virus subtype H5N1 (hereafter,
"H5N1") infection in humans is not completely understood, although
hypercytokinemia is thought to play a role. We previously reported that most H5N1
viruses induce high cytokine responses in human macrophages, whereas some H5N1
viruses induce only a low level of cytokine production similar to that induced by
seasonal viruses. METHODS: To identify the viral molecular determinants for
cytokine induction of H5N1 viruses in human macrophages, we generated a series of
reassortant viruses between the high cytokine inducer A/Vietnam/UT3028II/03 clone
2 (VN3028IIcl2) and the low inducer A/Indonesia/UT3006/05 (IDN3006) and evaluated
cytokine expression in human macrophages. RESULTS: Viruses possessing the acidic
polymerase (PA) gene of VN3028IIcl2 exhibited high levels of
hypercytokinemia-related cytokine expression in human macrophages, compared with
IDN3006, but showed no substantial differences in viral growth in these cells.
Further, the PA gene of VN3028IIcl2 conferred enhanced virulence in mice.
CONCLUSIONS: These results demonstrate that the PA gene of VN3028IIcl2 affects
cytokine production in human macrophages and virulence in mice. These findings
provide new insights into the cytokine-mediated pathogenesis of H5N1 infection in
humans.
|Animals
[MESH]
|Cytokines/biosynthesis/immunology
[MESH]
|Epithelial Cells/immunology/virology
[MESH]
|Female
[MESH]
|HEK293 Cells
[MESH]
|Humans
[MESH]
|Influenza A Virus, H5N1 Subtype/genetics/*pathogenicity/physiology
[MESH]