Equine interferon gamma synthesis in lymphocytes after in vivo infection and in vitro stimulation with EHV-1

Equine cytotoxic T lymphocyte (CTL) responses to equine herpesvirus-1 (EHV-1) are well characterised but little is known about the cytokine response after infection or vaccination. EHV-1 is common in horses and infects lymphocytes in vivo. This virus was used as a model to measure the synthesis of i...

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Veröffentlicht in:Vaccine 2005-08, Vol.23 (36), p.4541-4551
Hauptverfasser: Paillot, R., Daly, J.M., Juillard, V., Minke, J.M., Hannant, D., Kydd, J.H.
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Sprache:eng
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Zusammenfassung:Equine cytotoxic T lymphocyte (CTL) responses to equine herpesvirus-1 (EHV-1) are well characterised but little is known about the cytokine response after infection or vaccination. EHV-1 is common in horses and infects lymphocytes in vivo. This virus was used as a model to measure the synthesis of interferon gamma (IFN-γ) by equine peripheral blood mononuclear cells (PBMC) after in vivo infection and/or in vitro stimulation with EHV-1. Both flow cytometry and ELISPOT assays were used to quantify equine IFN-γ using a mouse anti-bovine IFN-γ monoclonal antibody (clone CC302; shown to cross-react with recombinant equine IFN-γ) and a rabbit anti-canine IFN-γ polyclonal antibody. The percentage of PBMC synthesising IFN-γ after in vitro stimulation with EHV-1 increased with age. In yearlings infected experimentally with EHV-1, PBMC showed two peaks of IFN-γ synthesis, 11 and 56 days after infection. The IFN-γ synthesis was principally associated with CD8 + cells. The patterns of IFN-γ synthesis detected by intracellular IFN-γ staining or ELISPOT were compared with CTL data and shown to be similar. These methods were also applied successfully to frozen samples of PBMC. Measurement of equine IFN-γ using these simple techniques can now be applied to future studies on protective cellular immune responses following virus infection and/or vaccination of horses.
ISSN:0264-410X
1873-2518
DOI:10.1016/j.vaccine.2005.03.048