Skovgaard, Kerstin1; Cirera, Susanna4; Vasby, Ditte5; Podolska, Agnieszka4; Breum, Solvej Østergaard6; Dürrwald, Ralf5; Schlegel, Michael7; Heegaard, Peter M. H.1
1 National Veterinary Institute, Technical University of Denmark2 Section for Immunology and Vaccinology, National Veterinary Institute, Technical University of Denmark3 Section for Virology, National Veterinary Institute, Technical University of Denmark4 University of Copenhagen5 Technical University of Denmark6 National Food Institute, Technical University of Denmark7 IDT-Biologika GmbH
This study aimed at providing a better understanding of the involvement of innate immune factors, including miRNA, in the local host response to influenza virus infection. Twenty pigs were challenged by influenza A virus subtype H1N2. Expression of microRNA (miRNA), mRNA and proteins were quantified in lung tissue at different time points after challenge (24 h, 72 h and 14 d post-infection (p.i.). Several groups of genes were significantly regulated according to time point and infection status including pattern recognition receptors (TLR2, TLR3, TLR7, retinoic acid-inducible gene I, melanoma differentiation associated protein-5), IFN and IFN-induced genes (IFN-β, IFN-γ, IRF7, STAT1, ISG15 and OASL), cytokines (IL-1 β, IL-1RN, IL-6, IL-7, IL-10, IL-12A, TNF-α, CCL2, CCL3 and CXCL10) and several acute phase proteins. Likewise, the following miRNAs were differentially expressed in one or more time groups compared with the control pigs: miR-15a, miR-21, miR-146, miR-206, miR-223 and miR-451. At d 1 p.i. lung tissue protein levels of IL-6, IL-12 and IFN-α were significantly increased compared with the control group, and haptoglobin and C-reactive protein were significantly increased at d 3 p.i. Our results suggest that, in addition to a wide range of innate immune factors, miRNAs may also be involved in controlling acute influenza infection in pigs.
Innate Immunity, 2013, Vol 19, Issue 5, p. 531-544