Detection of Lymphoproliferative Responses Against Pseudorabies Virus Immediate Early Protein (IE180) in Swine Immunized with a Modified Live Virus Vaccine

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Abstract
The immediate early protein (IE180) of pseudorabies virus (PrV) was generated by cycloheximide (CHX) reversal procedures in PrV-infected swine skin cells. Using this DZ180 preparation as antigen, specific proliferation was detected in mononuclear cells (PBMNCs) from swine vaccinated with a modified live virus (MLV) PrV vaccine. Two sets of data support this conclusion, (a) PBMNCs of c/cSLA inbred swine vaccinated with an MLV vaccine a year before the test exhibited significant responses against structural virion proteins and IE180. (b) Vaccination of PrV-negative swine with the same MLV vaccine induced a conversion from an unresponsive state against IE180 to one of specific antigen-driven responsiveness. The responses of vaccinated swine against IE180 were significantly higher than their preimmune responses (p ≤ 0.003) or to the response of control swine (p ≤ 0.045). Moreover, IE 180 antigens obtained from lysates of CHX-reversed, PrV-infected cells by heparin/agarose affinity separation also stimulated specific proliferation of PBMNCs from MLV-vaccinated swine, as their proliferative responses were significantly higher than those of unvaccinated swine (p ≤ 0.05). These data suggest that PrV IE180 contributes at least in part to the overall cellular response to PrV.

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