title: Marek's disease virus influences the expression of genes associated with IFN-gamma-inducible MHC class II expression.
abstract: Chickens infected with Marek's disease virus (MDV) become lifelong carriers regardless of their susceptibility to clinical disease. Therefore various viral immune-evasive mechanisms must play a role in MDV-host interactions. MDV has previously been shown to influence the expression of major histocompatibility complex (MHC) class II molecules. However, little is known about the underlying mechanisms of this phenomenon. In the present study, we studied the effect of MDV infection on the expression of several genes associated with IFN-gamma-inducible MHC class II expression at 4, 7, 14, and 21 days post-infection (dpi). There was a significant (p <or= 0.05) downregulation of MHC class II beta chain expression throughout the experiment, while other components of the MHC class II heterotrimer (i.e., alpha chain and the invariant chain) were significantly downregulated only at 4 and 21 dpi. Furthermore, the expression of components of the IFN-gamma-receptor complex was significantly downregulated at 4 dpi. In contrast, a number of other IFN-gamma-signaling molecules, including signal transducer and activator of transcription 1 (STAT1), interferon-responsive factor 1 (IRF-1), and class II transactivator (CIITA) were significantly upregulated at most time points. The results of this study shed light on the possible mechanisms by which MDV may evade host immunosurveillance.
authors.affiliation: Department of Pathobiology, University of Guelph, Guelph, Ontario, Canada.
authors.forename: Niroshan
authors.initials: N
authors.lastname: Thanthrige-Don
authors.forename: Leah R
authors.initials: LR
authors.lastname: Read
authors.forename: Mohamed Faizal
authors.initials: MF
authors.lastname: Abdul-Careem
authors.forename: Hakimeh
authors.initials: H
authors.lastname: Mohammadi
authors.forename: Amirul I
authors.initials: AI
authors.lastname: Mallick
authors.forename: Shayan
authors.initials: S
authors.lastname: Sharif
mesh_terms: D000818:Animals; D002645:Chickens / Q000821:virology*; D020869:Gene Expression Profiling; D005802:Genes, MHC Class II; D007157:Immunologic Surveillance / Q000235:genetics*; D050856:Interferon Regulatory Factor-1 / Q000235:genetics; D007371:Interferon-gamma / Q000276:immunology*; D025922:Mardivirus / Q000276:immunology*; D008380:Marek Disease / Q000235:genetics / Q000276:immunology*; D009687:Nuclear Proteins / Q000235:genetics; D011201:Poultry Diseases / Q000235:genetics / Q000276:immunology*; D017471:Receptors, Interferon / Q000235:genetics; D050794:STAT1 Transcription Factor / Q000378:metabolism; D015398:Signal Transduction; D013997:Time Factors; D015534:Trans-Activators / Q000235:genetics; D000096743:Interferon gamma Receptor
chemical_list: D050856:Interferon Regulatory Factor-1; D007371:Interferon-gamma; D009687:Nuclear Proteins; D017471:Receptors, Interferon; D050794:STAT1 Transcription Factor; D015534:Trans-Activators; D000096743:Interferon gamma Receptor; C083728:MHC class II transactivator protein