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Intranasal Treatment with Poly(I·C) Protects Aged Mice from Lethal Respiratory Virus Infections

Identifieur interne : 001D01 ( Main/Exploration ); précédent : 001D00; suivant : 001D02

Intranasal Treatment with Poly(I·C) Protects Aged Mice from Lethal Respiratory Virus Infections

Auteurs : Jincun Zhao ; Christine Wohlford-Lenane [États-Unis] ; Jingxian Zhao [République populaire de Chine] ; Erica Fleming ; Thomas E. Lane [États-Unis] ; Paul B. Mccray [États-Unis] ; Stanley Perlman [États-Unis]

Source :

RBID : PMC:3486278

Descripteurs français

English descriptors

Abstract

In the 2002-2003 severe acute respiratory syndrome coronavirus (SARS-CoV) epidemic, no patients under 24 years of age died, while mortality was greater than 50% in those over 65 years. Greater than 90% of all deaths from influenza A virus (IAV) occur in the elderly (>65 years of age). To address this age-related susceptibility to SARS-CoV and IAV, we infected C57BL/6 (B6) mice with mouse-adapted SARS-CoV (MA15) or IAV (PR8), both of which cause severe disease in aged mice. Intranasal pretreatment of aged mice with poly(I·C) (a TLR3 agonist) and, to a lesser extent, CpG, R848, or lipopolysaccharide (TLR9, TLR7/8, or TLR4 agonists), provided a high level of protection [90% to 100% survival rate after poly(I·C) treatment] against lethal MA15 or IAV challenge and reduced pathological changes and virus loads in the lungs at early times after infection. Poly(I·C) pretreatment upregulated beta interferon (IFN-β), IFN-γ, IL-1β, and tumor necrosis factor (TNF) gene expression in the lungs. Intranasal pretreatment with IFN-β or IFN-γ but not IL-1β or TNF also protected aged mice, consistent with the notion that poly(I·C) pretreatment functioned, at least in part, by inducing IFN-β and IFN-γ. We also identified a potential cellular target for poly(I·C) by showing that treatment inhibited virus replication in primary human airway epithelial cells. These results suggest that intranasal poly(I·C) should be evaluated as a prophylactic agent in aged individuals at high risk for contracting SARS-CoV or IAV infections.


Url:
DOI: 10.1128/JVI.01410-12
PubMed: 22915814
PubMed Central: 3486278


Affiliations:


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<p>In the 2002-2003 severe acute respiratory syndrome coronavirus (SARS-CoV) epidemic, no patients under 24 years of age died, while mortality was greater than 50% in those over 65 years. Greater than 90% of all deaths from influenza A virus (IAV) occur in the elderly (>65 years of age). To address this age-related susceptibility to SARS-CoV and IAV, we infected C57BL/6 (B6) mice with mouse-adapted SARS-CoV (MA15) or IAV (PR8), both of which cause severe disease in aged mice. Intranasal pretreatment of aged mice with poly(I·C) (a TLR3 agonist) and, to a lesser extent, CpG, R848, or lipopolysaccharide (TLR9, TLR7/8, or TLR4 agonists), provided a high level of protection [90% to 100% survival rate after poly(I·C) treatment] against lethal MA15 or IAV challenge and reduced pathological changes and virus loads in the lungs at early times after infection. Poly(I·C) pretreatment upregulated beta interferon (IFN-β), IFN-γ, IL-1β, and tumor necrosis factor (TNF) gene expression in the lungs. Intranasal pretreatment with IFN-β or IFN-γ but not IL-1β or TNF also protected aged mice, consistent with the notion that poly(I·C) pretreatment functioned, at least in part, by inducing IFN-β and IFN-γ. We also identified a potential cellular target for poly(I·C) by showing that treatment inhibited virus replication in primary human airway epithelial cells. These results suggest that intranasal poly(I·C) should be evaluated as a prophylactic agent in aged individuals at high risk for contracting SARS-CoV or IAV infections.</p>
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