Impact of Porcine Arterivirus, Influenza B, and Their Coinfection on Antiviral Response in the Porcine Lung
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pathogens Article Impact of Porcine Arterivirus, Influenza B, and Their Coinfection on Antiviral Response in the Porcine Lung Damarius S. Fleming 1,2, Laura C. Miller 2,*, Yun Tian 3, Yonghai Li 4, Wenjun Ma 4,5 and Yongming Sang 3,* Article 1 Oak Ridge InstituteImpact for Science of Porcine and Education Arterivirus, Oakridge, Oak Ridge Influenza Associated Universities,B, and Their Oak Ridge, TNCoinfection 37830, USA; damarius.fl[email protected] on Antiviral Response in the Porcine 2 Virus and Prion Research Unit, National Animal Disease Center, USDA, Agricultural Research Service, Ames, IA 50161,Lung USA 3 Department of Agricultural and Environmental Sciences, Tennessee State University, Damarius S. Fleming 1,2, Laura C. Miller 2,*, Yun Tian 3, Yonghai Li 4, Wenjun Ma 4,5 and Nashville, TN 37209, USA; [email protected] Yongming Sang 3,* 4 Department of Diagnostic Medicine and Pathobiology, Kansas State University, Manhattan, KS 66506, USA; 1 [email protected] Oak (Y.L.); Ridge Institute [email protected] for Science and Education (W.M.) Oakridge, Oak Ridge Associated Universities, Oak Ridge, 5 TN 37830, USA; [email protected] Department of2 VeterinaryVirus and Prion Pathobiology Research Unit, and National Department Animal Disease of Molecular Center, USDA Microbiology, Agricultural & Research Immunology, Service, University of Missouri,Ames, IA Columbia, 50161, USA MO 65211, USA * Correspondence:3 Department [email protected] of Agricultural and (L.C.M.); Environmental [email protected] Sciences, Tennessee (Y.S.) State University, Nashville, TN 37209, USA; [email protected] 4 Department of Diagnostic Medicine and Pathobiology, Kansas State University, Manhattan, KS 66506, Received: 22 September 2020; Accepted: 28 October 2020; Published: 11 November 2020 USA; [email protected] (Y.L.); [email protected] (W.M.) 5 Department of Veterinary Pathobiology and Department of Molecular Microbiology & Immunology, Abstract: InterferonUniversity (IFN) cytokinesof Missouri, Columbia, induce MO an autonomous65211, USA antiviral state in cells of the infected site * Correspondence: [email protected] (L.C.M.); [email protected] (Y.S.) to restrict virus spreading and critically regulate overall antiviral response. The antiviral state leads Received: 22 September 2020; Accepted: 28 October 2020; Published: 11 November 2020 to host protection through expression of hundreds of IFN-stimulated genes that restrict viral infection through multipleAbstract: mechanisms, Interferon for(IFN) example, cytokines induce directly autonomous in viral antiviral genome state degradation in cells of the infected and indirectly site to through cellularrestrict metabolic virus spreading inhibition. and critically Young regulate pigs were overall split antiviral into response. four treatment The antiviral groups: state leads control, to host protection through expression of hundreds of IFN-stimulated genes that restrict viral infection porcine reproductivethrough and multiple respiratory mechanisms, syndrome for example, virus directly (PRRSV, in viral also genome known degradation as porcine and arterivirus)indirectly infected, influenzathrough B virus cellular (IBV) metabolic infected, inhibition. and IBVYoung/PRRSV pigs were coinfection. split into four Lung treatment tissue groups: was control, collected at 3, 5, and 7 daysporcine post reproductive infection and (dpi) respiratory for control, syndrome PRRSV virus (PRRSV, and IBV also/PRRSV known as coinfection, porcine arterivirus) and at 3 and 5 dpi for IBV.infected, Transcriptomic influenza B virus analysis, (IBV) infected, using and usegalaxy.org IBV/PRRSV coinfection. tools, was Lung performed tissue was collected against at the 3, 5, and 7 days post infection (dpi) for control, PRRSV and IBV/PRRSV coinfection, and at 3 and 5 S.scrofa 11.1 referencedpi for IBV. genome. Transcriptomic Differentially analysis, expressedusing usegalaxy.org gene (DEG) tools, was analysis performed was against carried the outS.scrofa using DeSeq2 based on11.1 the reference model genome. treatment Differentially+ dpi + expressedtreatment:dpi gene (DEG)+ E. analysis Downstream was carried analysis out usingexamined DeSeq2 the interaction ofbased DEG on atthe each model dpi treatment for over-enriched + dpi + treatment: genedpi ontology+ E. Downstream (G.O.) analysis terms andexamined pathways. the Comparisons ofinteraction the infected of DEG groups at each vs. dpi the for controlsover-enriched yielded gene aontology total of(G.O.) (n = terms1412) and DEGs pathways. for the Comparisons of the infected groups vs. the controls yielded a total of (n = 1412) DEGs for the PRRSV PRRSV group andgroup (n and= 1578) (n = 1578) for thefor the IBV IBV/PRRSV/PRRSV group across across all timepoints. all timepoints. The IBV The group IBV had group (n = 64) had (n = 64) total DEGstotal DEGs across across 3 and 3 and 5 dpi.5 dpi. ExpressionExpression data data were were considered considered statistically statistically significant based significant on based on false discoveryfalse discovery rate rate (FDR) (FDR) ⫹ 0.1. Venn Venn diagram diagram comparisons comparisons of the DEGs of across theDEGs dpi showed across thatdpi showed that groupsgroups shared shared only only 16 16 DEGs DEGs at 3 dpi, at 3no dpi, DEGs no were DEGs shared were at 5 dpi, shared and for at 7 5 dpi, dpi, only and the forPRRSV 7 dpi, and IBV/PRRSV groups were compared and shared a total of 43 DEGs. Across the comparisons, only the PRRSVdifferential and IBV/ PRRSVexpression groups was observed were in compared antiviral genes and such shared as IRF1, a total MX1,of and 43 OAS2. DEGs. TheAcross IBV and the comparisons, diffIBV/PRRSVerential expression groups showed was higher observed expression in antiviral of antiviral genes genes such at earlier as IRF1, dpi than MX1, the and PRRSV OAS2. The IBV and IBVgroup./PRRSV Additionally, groups showed downregulated higher expressiongenes from ofthe antiviralcomparisons genes clustered at earlier around dpi Kyoto than the PRRSV group. Additionally,Encyclopedia of downregulatedGenes and Genomes genes (KEGG) from path theways comparisons effecting lung development clustered around and cellular Kyoto integrity. Early expression of host IFN and antiviral genes may lead to viral RNA degradation, and Encyclopedia ofassembly Genes andand transcription Genomes (KEGG)inhibition in pathways the IBV infections. effecting In comparison, lung development expression of and antiviral cellular integrity. Earlygenes expression in the PRRSV of host group IFN decreased and antiviral across time genes. The decrease may leadmay explain to viral why RNA PRRSV degradation, infections and assembly andpersist, transcription while IBV inhibition clears. Moreover, in the IBV all infections.infected groups In comparison,showed prolonged expression upregulation of antiviral in genes in the PRRSVneutrophil group degranulation decreased acrosspathway time. activity, The decreasepossibly exacerbating may explain symptomatic why PRRSV lung infections lesion pathology seen in these respiratory infections. persist, while IBV clears. Moreover, all infected groups showed prolonged upregulation in neutrophil degranulation pathwayKeywords: activity, PRRSV; IBV-S; possibly lung;exacerbating immune response; symptomatic differential expression lung lesion pathology seen in these respiratoryPathogens infections. 2020, 9, x; doi: FOR PEER REVIEW www.mdpi.com/journal/pathogens Pathogens 2020, 9, 934; doi:10.3390/pathogens9110934 www.mdpi.com/journal/pathogens Pathogens 2020, 9, 934 2 of 19 Keywords: PRRSV; IBV-S; lung; immune response; differential expression 1. Introduction The onset of viral respiratory infections in swine production systems can often lead to rapid spread due to a variety factors that include, but are not limited to, housing, stocking density, and shipping. Additionally, pigs are subject to species-specific respiratory illnesses such as porcine reproductive and respiratory syndrome virus (PRRSV, also known as porcine arterivirus) and zoonotic pathogens such as influenza B [1–3]. Previous studies have shown that PRRSV is the more common swine infection of the two respiratory diseases and can develop co-infections with influenza B (IBV) [1]. There is also evidence that PRRSV and porcine influenza A, while sharing some overlap, produced differences in immune related gene expression during the first seven days of infection [4]. During infection, the anti-viral response is achieved through the process of interferon (IFN)-mediated antiviral immunity that leads to virus-restriction in the infected cell and activation of the antiviral state in neighboring cells [5,6]. The antiviral state leads to host protection through expression of IFN-stimulated genes (ISGs) that restrict viruses through translation inhibition, viral degradation, and mRNA assembly and transcription inhibition. The effect of IFNs and ISGs drives the induction of the antiviral state in adjacent cells as a major mechanism of the antiviral innate immunity. For immune cells, neutrophils and macrophages, as part of the early reaction to viral lung infections, act as first responders and along with ISGs use inflammation and phagocytosis to clear pathogens through mediating inflammation, phagocytosis and expression of ISGs and other immune effectors [5–7]. Both PRRSV and IBV cause natural infections in pigs, and IBV is a representative zoonotic and anthroponotic virus able to infect humans. Pigs with a coinfection by PRRSV and IBV thus provide a model to study the viral interaction