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2010 ; 202
(8
): 1161-70
Nephropedia Template TP
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Mice lacking both TNF and IL-1 receptors exhibit reduced lung inflammation and
delay in onset of death following infection with a highly virulent H5N1 virus
#MMPMID20815704
Perrone LA
; Szretter KJ
; Katz JM
; Mizgerd JP
; Tumpey TM
J Infect Dis
2010[Oct]; 202
(8
): 1161-70
PMID20815704
show ga
BACKGROUND: Highly pathogenic avian influenza viruses of the H5N1 subtype
continue to cross the species barrier to infect humans and cause severe disease.
It has been suggested that an exaggerated immune response contributes to the
pathogenesis of H5N1 virus infection in mammals. In particular, H5N1 virus
infections are associated with a high expression of the proinflammatory
cytokines, including interleukin-1 (IL-1) and tumor necrosis factor alpha
(TNF-?). METHODS: We investigated the compounding affects of both cytokines on
the outcome of H5N1 virus disease by using triple mutant mice deficient in 3
signaling receptors, TNF-R1, TNF-R2, and IL-1-RI. RESULTS: Triple mutant mice
exhibited reduced morbidity and a significant delay in mortality following lethal
challenge with a lethal H5N1 virus, whereas no such differences were observed
with the less virulent A/PR/8/34 (H1N1) virus. H5N1-infected triple mutant mice
displayed diminished cytokine production in lung tissue and a quantifiable
decrease of macrophages and neutrophils in the lungs postinfection. Moreover,
morphometric analysis of airway sections revealed less extensive inflammation in
H5N1-infected triple mutant mice, compared with infected wild-type mice.
CONCLUSIONS: The combined signaling from the TNF or IL-1 receptors promotes
maximal lung inflammation that may contribute to the severity of disease caused
by H5N1 virus infection.