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Antiviral Res. 2016 Oct;134:1-5. doi: 10.1016/j.antiviral.2016.08.017. Epub 2016 Aug 18.

Duox2 is required for the transcription of pattern recognition receptors in acute viral lung infection: An interferon-independent regulatory mechanism.

Author information

1
Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine Korea University, Ansan, South Korea.
2
Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul, South Korea.
3
Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul, South Korea. Electronic address: hyunjerry@snu.ac.kr.

Abstract

The innate immune response, which constitutes the first line of defense against influenza A virus (IAV) infection, is activated by pattern recognition receptors (PRRs) that recognize viral structures. We found that the PRRs, retinoic acid-inducible gene 1 (RIG-I) and melanoma differentiation-associated protein 5 (MDA5), which have been implicated as interferon (IFN)-stimulated genes, were dominantly responsible for the recognition of IAV in lungs of mice at 3 and 7 days post infection (dpi). Intranasal administration of IFNs enhanced RIG-I and MDA5 gene expression after IAV infection and mRNA levels of RIG-I and MDA5 were significantly reduced at 7 dpi in mice with neutralization of secreted IFNs. However, blockade of IFNs did not alter the transcription of RIG-I and MDA5 at 3 dpi. We studied the antiviral effect of Duox2 in vivo lung to elucidate the role of Duox2 in respiratory mucosa. RIG-I and MDA5 mRNA levels were induced to a lower extent in lungs of mice that were inoculated with Duox2 small hairpin RNA regardless of secreted IFNs at 3 dpi. We propose that Duox2 is responsible for IFN-independent signaling for induction of PRRs transcription and can control acute IAV lung infection at the beginning of infection.

KEYWORDS:

Acute viral lung infection; Duox2; Influenza A virus; MDA5; RIG-I

PMID:
27546489
DOI:
10.1016/j.antiviral.2016.08.017
[Indexed for MEDLINE]

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