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Impact of genotype 1 and 2 of porcine reproductive and respiratory syndrome viruses on interferon-α responses by plasmacytoid dendritic cells.
- Source :
-
Veterinary research [Vet Res] 2013 May 15; Vol. 44, pp. 33. Date of Electronic Publication: 2013 May 15. - Publication Year :
- 2013
-
Abstract
- Porcine reproductive and respiratory syndrome (PRRS) virus (PRRSV) infections are characterized by prolonged viremia and viral shedding consistent with incomplete immunity. Type I interferons (IFN) are essential for mounting efficient antiviral innate and adaptive immune responses, but in a recent study, North American PRRSV genotype 2 isolates did not induce, or even strongly inhibited, IFN-α in plasmacytoid dendritic cells (pDC), representing "professional IFN-α-producing cells". Since inhibition of IFN-α expression might initiate PRRSV pathogenesis, we further characterized PRRSV effects and host modifying factors on IFN-α responses of pDC. Surprisingly, a variety of type 1 and type 2 PRRSV directly stimulated IFN-α secretion by pDC. The effect did not require live virus and was mediated through the TLR7 pathway. Furthermore, both IFN-γ and IL-4 significantly enhanced the pDC production of IFN-α in response to PRRSV exposure. PRRSV inhibition of IFN-α responses from enriched pDC stimulated by CpG oligodeoxynucleotides was weak or absent. VR-2332, the prototype genotype 2 PRRSV, only suppressed the responses by 34%, and the highest level of suppression (51%) was induced by a Chinese highly pathogenic PRRSV isolate. Taken together, these findings demonstrate that pDC respond to PRRSV and suggest that suppressive activities on pDC, if any, are moderate and strain-dependent. Thus, pDC may be a source of systemic IFN-α responses reported in PRRSV-infected animals, further contributing to the puzzling immunopathogenesis of PRRS.
- Subjects :
- Animals
Cells, Cultured
Dendritic Cells cytology
Dendritic Cells virology
Enzyme-Linked Immunosorbent Assay veterinary
Flow Cytometry veterinary
Macrophages, Alveolar cytology
Macrophages, Alveolar immunology
Macrophages, Alveolar virology
Porcine respiratory and reproductive syndrome virus classification
Porcine respiratory and reproductive syndrome virus genetics
Porcine respiratory and reproductive syndrome virus pathogenicity
Specific Pathogen-Free Organisms
Swine
Virulence
Dendritic Cells immunology
Genotype
Interferon-alpha metabolism
Porcine Reproductive and Respiratory Syndrome immunology
Porcine Reproductive and Respiratory Syndrome virology
Porcine respiratory and reproductive syndrome virus physiology
Subjects
Details
- Language :
- English
- ISSN :
- 1297-9716
- Volume :
- 44
- Database :
- MEDLINE
- Journal :
- Veterinary research
- Publication Type :
- Academic Journal
- Accession number :
- 23675981
- Full Text :
- https://doi.org/10.1186/1297-9716-44-33