Bacterial factors required for Streptococcus pneumoniae coinfection with influenza A virus

Yi Yin Chen, Ching Tai Huang, Shiao Wen Li, Yi Jiun Pan, Tzu Lung Lin, Ya Yu Huang, Ting Hsuan Li, Yu Ching Yang, Yu Nong Gong, Yu Chia Hsieh*

*此作品的通信作者

研究成果: 期刊稿件文章同行評審

5 引文 斯高帕斯(Scopus)

摘要

Background: Streptococcus pneumoniae is a common cause of post-influenza secondary bacterial infection, which results in excessive morbidity and mortality. Although 13-valent pneumococcal conjugate vaccine (PCV13) vaccination programs have decreased the incidence of pneumococcal pneumonia, PCV13 failed to prevent serotype 3 pneumococcal disease as effectively as other vaccine serotypes. We aimed to investigate the mechanisms underlying the co-pathogenesis of influenza virus and serotype 3 pneumococci. Methods: We carried out a genome-wide screening of a serotype 3 S. pneumoniae transposon insertion mutant library in a mouse model of coinfection with influenza A virus (IAV) to identify the bacterial factors required for this synergism. Results: Direct, high-throughput sequencing of transposon insertion sites identified 24 genes required for both coinfection and bacterial infection alone. Targeted deletion of the putative aminotransferase (PA) gene decreased bacterial growth, which was restored by supplementation with methionine. The bacterial burden in a coinfection with the PA gene deletion mutant and IAV in the lung was lower than that in a coinfection with wild-type pneumococcus and IAV, but was significantly higher than that in an infection with the PA gene deletion mutant alone. These data suggest that IAV infection alters host metabolism to benefit pneumococcal fitness and confer higher susceptibility to pneumococcal infection. We further demonstrated that bacterial growth was increased by supplementation with methionine or IAV-infected mouse lung homogenates. Conclusions: The data indicates that modulation of host metabolism during IAV infection may serve as a potential therapeutic intervention against secondary bacterial infections caused by serotype 3 pneumococci during IAV outbreaks in the future.

原文英語
文章編號60
期刊Journal of Biomedical Science
28
發行號1
DOIs
出版狀態已出版 - 12 2021

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© 2021, The Author(s).

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