Zanamivir Diminishes Lung Damage in Influenza A Virus-infected Mice by Inhibiting Nitric Oxide Production
0303 health sciences
Time Factors
Histocytochemistry
Body Weight
Gene Expression
Nitric Oxide Synthase Type II
Viral Load
Nitric Oxide
Antiviral Agents
3. Good health
Disease Models, Animal
Mice
03 medical and health sciences
Orthomyxoviridae Infections
Influenza A virus
Animals
Female
Zanamivir
Bronchoalveolar Lavage Fluid
Lung
Biomarkers
DOI:
10.21873/invivo.11263
Publication Date:
2018-05-02T07:53:07Z
AUTHORS (8)
ABSTRACT
Severe pulmonary influenza A virus (IAV) infection causes lung inflammation and expression of inducible nitric oxide synthase (iNOS), leading to overproduction of nitric oxide (NO). We studied whether zanamivir reduces pulmonary inflammation through inhibition of NO production in mice.We treated IAV-infected mice daily with intranasal zanamivir. Controls were infected and either placebo-treated or untreated, or not infected and placebo-treated. Mice were weighed daily. After euthanasia on day 3, lungs were excised and bronchoalveolar lavage was performed and fluid nitrite concentration was determined. Lungs were analyzed microscopically. iNOS and IAV RNA levels in lungs were assessed using quantitative reverse transcription-polymerase chain reaction (RT-qPCR).Mice undergoing zanamivir treatment had less weight loss, viral replication, and lung damage, as well as significant reductions of local NO and iNOS mRNA synthesis (p<0.05).Zanamivir is associated with an anti-inflammatory effect mediated through inhibition of NO production in IAV-infected mice.
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