Unknown,Transcriptomics,Genomics,Proteomics

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Effect of miR-144 and miR-451 expression on lung epithelial cell responses to influenza infection at 1 and 18 hours.

ABSTRACT: Antiviral responses must be regulated to rapidly defend against infection while minimizing inflammatory damage, but the mechanisms for establishing the magnitude of response within an infected cell are not well understood. miRNAs are small non-coding RNAs that negatively regulate protein levels by binding target sequences on their cognate mRNA. Here we identify miR-144 as a negative regulator of the host antiviral response. Ectopic expression of miR-144 resulted in increased replication of three RNA viruses, influenza, EMCV, and VSV, in primary mouse lung epithelial cells. To elucidate the mechanism whereby miR-144 increases influenza replication within lung epithelial cells, immortalized murine Type I epithelial cells (Let1 cells) stably over-expressing miR-144 were infected with influenza A for 1 or 18 hours and the transcriptional profile was compared with those of infected control cells. This systems biology approach identified the transcriptional network regulated by miR-144 and demonstrated that it controls the TRAF6/IRF7 antiviral response by post-transcriptionally suppressing TRAF6 levels. In vivo ablation of miR-144 reduced influenza replication within the lung. 16 RNA samples from immortalized murine Type I airway epithelial cells (Let1 cells) were analyzed using Agilent microarrays. Cells expressing miR-144, miR-451, or a vector control (GFP) were analyzed after infection with PR8 influenza virus (MOI=5) for 1 or 18 hours.

ORGANISM(S): Mus musculus

SUBMITTER: Aderem Lab

PROVIDER: E-GEOD-50742 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Fibroblast growth factor (FGF) 2 (FGF2 or basic FGF) mediates a wide range of biological functions, such as regulating proliferation, angiogenesis, migration, differentiation and injury repair. However, the roles of FGF2 and the underlying mechanisms of action in influenza virus (IAV) -induced lung injury remain largely unexplored. In this study, we firstly report miR-194 expression is significantly decreased in A549 cells following influenza virus A/Beijing/501/2009 (BJ501) infection. MiR-194 directly targeting FGF2, a novel antiviral regulator, could suppress FGF2 expression both in mRNA and protein levels. Overexpression miR-194 facilitate IAV replication via negatively regulating type I IFN production, and reintroduction of FGF2 abrogates miR-194-induced effects on promoting IAV replication. On the contrary, inhibition of miR-194 alleviate IAV induced lung injury via promoting type I IFNs antiviral activities in vivo. Importantly, contrary to FGF2 activated RIG-I signaling pathway, miR-194 suppressed TBK1 and IRF3 phosphorylation. Taken together, our findings demonstrated that miR-194-FGF2 axis play a vital role in IAV-induced lung injury, and miR-194 antagonism might be as a potential therapeutic target during IAV infection. Fibroblast growth factor (FGF) 2 (FGF2 or basic FGF) mediates a wide range of biological functions, such as regulating proliferation, angiogenesis, migration, differentiation and injury repair. However, the roles of FGF2 and the underlying mechanisms of action in influenza virus (IAV) -induced lung injury remain largely unexplored. In this study, we firstly report miR-194 expression is significantly decreased in A549 cells following influenza virus A/Beijing/501/2009 (BJ501) infection. MiR-194 directly targeting FGF2, a novel antiviral regulator, could suppress FGF2 expression both in mRNA and protein levels. Overexpression miR-194 facilitate IAV replication via negatively regulating type I IFN production, and reintroduction of FGF2 abrogates miR-194-induced effects on promoting IAV replication. On the contrary, inhibition of miR-194 alleviate IAV induced lung injury via promoting type I IFNs antiviral activities in vivo. Importantly, contrary to FGF2 activated RIG-I signaling pathway, miR-194 suppressed TBK1 and IRF3 phosphorylation. Taken together, our findings demonstrated that miR-194-FGF2 axis play a vital role in IAV-induced lung injury, and miR-194 antagonism might be as a potential therapeutic target during IAV infection.

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Effect of miR-144 and miR-451 expression on lung epithelial cell responses to influenza infection at 1 and 18 hours.

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