Abstract:
:Friesian calves were infected with one of three isolates of bovine viral diarrhoea virus (BVDV) and used to establish parameters for an in vitro model of BVDV-reactive T-cell responses in cattle. The study assessed virus clearance, seroconversion, maturation of lymphoproliferative responses (both during and following disease resolution) and the antigen-specificity of CD4(+) T cells from recovered animals. Seroconversion and virus-specific lymphoproliferation were not detected until viraemia had resolved. Interestingly, lymphoproliferation was detected earlier in the animals infected with cytopathic viruses than in those infected with noncytopathic virus despite broadly similar rates of virus clearance and seroconversion for both biotypes. CD4(+) and CD8(+) T cells were induced to proliferate by virus-infected stimulator cells whereas only CD4(+) T cells responded to non-infectious antigens. Lymphoproliferation was strain cross-reactive and MHC-restricted. Induction of T-cell proliferation by recombinant proteins identified the major envelope proteins E(rns) and E2 and the nonstructural (NS) 2-3 protein as T-cell determinants. In addition, the capsid (C) and/or the amino-terminal proteinase, N(pro) were identified as T-cell determinants from the responses of short-term T-cell lines. Thus, in this model, the CD4(+) T-cell repertoire induce by acute BVDV infection includes at least the major envelope proteins, NS2-3, and capsid and/or N(pro).
journal_name
Virus Resjournal_title
Virus researchauthors
Collen T,Morrison WIdoi
10.1016/s0168-1702(00)00131-3subject
Has Abstractpub_date
2000-03-01 00:00:00pages
67-80issue
1eissn
0168-1702issn
1872-7492pii
S0168-1702(00)00131-3journal_volume
67pub_type
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