1887

Abstract

To study the biological relevance of using bovine herpesvirus-1 (BHV-1) as a vector for expressing cytokines, a BHV-1 virus that expressed bovine interferon-γ (IFN-γ) was constructed. This recombinant virus (BHV-1/IFNγ) was then used to infect the natural host in a respiratory disease model. characterization of the recombinant interferon-γ confirmed that the cytokine expressed in BHV-1-infected cells was biologically active. The effects of the recombinant IFN-γ were then analysed during a primary infection and after reactivation of a latent infection. During the primary infection, similar body temperature, clinical responses and virus shedding were observed for calves infected with either recombinant BHV-1/IFNγ or parental gC/LacZ virus. An analysis of cellular and humoral responses did not reveal any significant immunomodulation by BHV-1/IFNγ during the primary infection. The stability and activity of recombinant IFN-γ was also analysed following the establishment of a latent infection. The presence of recombinant IFN-γ did not significantly alter virus shedding following reactivation. The isolation of reactivated BHV-1/IFNγ virus confirmed that a functional IFN-γ gene was retained during latency. Thus, herpesviruses may provide virus vectors that retain functional genes during latency and recrudescence.

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2000-11-01
2024-04-19
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