Submitted to: International Virtual Conference on Infectious Diseases of Animals
Publication Type: Abstract Only
Publication Acceptance Date: May 2, 1997
Publication Date: N/A
Technical Abstract: Pseudorabies virus (PrV), like other herpesviruses, is a neurotropic virus which can establish a latent infection in swine. Reactivation of PrV from latency may occur spontaneously or after induction with corticosteroids. The mechanisms involved in the establishment of latency and reactivation are currently unknown. Here we have examined gene-specific reactivation of PrV by herpes simplex virus type 1 (HSV-1) immediate early protein, ICP-0. Primary neuronal cell cultures established from the trigeminal ganglia of latently infected swine were superinfected with recombinant adenoviruses expressing ICP-0. Reactivation of PrV occurred in cultures that were superinfected with two different ICP-0-expressing adenovirus recombinants, but not in cultures that were either mock-infected, or superinfected with wild-type adenovirus, or recombinant adenoviruses not expressing ICP-0. Infectious PrV was detected between 4 and 7 days postinfection (PI), regardless of the promoter driving expression of ICP-0. Results from these experiments show that HSV-1 ICP-0, a homolog of PrV EPO, can reactivate PrV from latently infected trigeminal ganglia of swine.