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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 Influenza+Other+Respir+Viruses
2011 ; 5
(5
): 343-50
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Oseltamivir treatment of mice before or after mild influenza infection reduced
cellular and cytokine inflammation in the lung
#MMPMID21668689
Wong ZX
; Jones JE
; Anderson GP
; Gualano RC
Influenza Other Respir Viruses
2011[Sep]; 5
(5
): 343-50
PMID21668689
show ga
BACKGROUND: Lung inflammation is a critical determinant of influenza infection
outcomes but is seldom evaluated in animal studies of oseltamivir (OS), which
have focused on viral titre and survival. OBJECTIVES: To study the effects of
pre- and post-infection dosing with OS on viral replication and inflammation in a
mouse model of non-lethal influenza infection. METHODS: BALB/c mice were infected
with a laboratory-adapted H3N1 strain of influenza. In pre-dosing studies, OS was
gavaged twice daily (1 and 10 mg/kg/day) from 4 hours prior to infection and
continuing for 5 days (d) post-infection (p.i). In the second post-infection
dosing study, dosing at 10 mg/kg/day began at 24-48 hours p.i. Mice were
dissected at d3, d5 and d7 p.i. (pre-dosing study) and d5 p.i. (post-dosing
study). Lung viral titres were determined by plaque assay. Bronchoalveolar lavage
fluid (BALF) was collected and used for the quantitation of inflammatory cells
and mediators. RESULTS: Pre-infection dosing of OS reduced total cells,
neutrophils and macrophages in BALF. With pre- or post-infection dosing, the
pro-inflammatory mediators TNF-?, IL-1?, IL-6 and granulocyte-macrophage
colony-stimulating factor, the neutrophil chemokines keratinocyte-derived
chemokine and MIP-1? and the macrophage chemokine MCP-1 were reduced in BALF.
Pre-dosing with 1 mg/kg OS did not reduce viral titres, while 10 mg/kg slightly
reduced viral titres at d3 and d5 p.i. CONCLUSIONS: Oseltamivir reduced the
inflammatory response to influenza when given pre- or post-infection. This
anti-inflammatory effect may contribute to the clinical benefit of OS.