The Induction of Pattern-Recognition Receptor Expression against Influenza A Virus through Duox2-Derived Reactive Oxygen Species in Nasal Mucosa

American Journal of Respiratory Cell and Molecular Biology
Hyun Jik KimJoo-Heon Yoon

Abstract

We studied the relative roles of Duox2-derived reactive oxygen species (ROS) in host defense against influenza A virus (IAV) infection in normal human nasal epithelial cells and mouse nasal mucosa. We found that Duox2 primarily generated ROS rapidly after IAV infection in normal human nasal epithelial cells and that knockdown of Duox2 aggravated IAV infection. In addition, Duox2-derived ROS enhancement significantly suppressed IAV infection in nasal epithelium. In particular, Duox2-derived ROS were required for the induction of retinoic acid-inducible gene (RIG)-I and melanoma differentiation-associated protein 5 (MDA5) transcription. After intranasal IAV inoculation into mice, viral infection was significantly aggravated from 3 days postinoculation (dpi) in the nasal mucosa, and the IAV viral titer was highest at 7 dpi. Both RIG-I and MDA5 messenger RNA levels increased dominantly in mouse nasal mucosa from 3 dpi; consistent with this, RIG-I and MDA5 proteins were also induced after IAV infection. RIG-I and MDA5 messenger RNA levels were induced to a lower extent in the nasal mucosa of the mice that were inoculated with Duox2 short hairpin RNA, and the IAV viral titer was significantly higher in nasal lavage. Taken together, D...Continue Reading

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