Abstract:
:Expression of the high-affinity interleukin 2 receptor alpha chain (CD25) was used to monitor antigen-specific activation of T lymphocyte subsets (CD4+, CD8+, and gammadelta T cells) from cattle immunized with modified live bovine herpesvirus-1 (BHV-1). Calves seronegative for BHV-1 were either vaccinated with one dose of modified live vaccine containing BHV-1 or not vaccinated to serve as negative controls. Two animals vaccinated 7 and 5 weeks before the start of the experiment with two doses of modified live vaccine containing BHV-1 served as positive controls. Blood samples were taken from the nonvaccinate group, the positive control group, and the vaccinate group at 0, 21, 35, 60, and 90 days postinoculation (PI). Isolated peripheral blood mononuclear cells from immunized and control animals were incubated for 5 days with and without live BHV-1 ISU99. Compared to the nonvaccinates, a significant (p < 0.05) increase in expression of CD25 by CD4+, CD8+, and gammadelta T lymphocytes from the vaccinate group was detected following in vitro exposure to live BHV-1 after vaccination. This is apparently the first report using live BHV-1 to stimulate lymphocytes in vitro and showing CD8+ T cell activation. Peripheral blood from the positive control animals was depleted of CD4+, CD8+, or gammadelta T lymphocytes prior to incubation with BHV-1 to assess bystander activation in the CD25 expression assay. When incubated with live BHV-1, depletion of CD4+ T cells depressed the expression of CD25 by CD8+ T cells, but not gammadelta T cells. Depleting CD8+ or gammadelta T cells prior to in vitro culture with BHV-1 did not affect the expression of CD25 by the remaining T lymphocyte subsets. Vaccinates were protected from challenge with virulent BHV-1 at 110 days postvaccination compared to nonvaccinates. Expression of CD25 appears to be a useful marker for evaluating induction of antigen-specific T lymphocyte subset responses following vaccination.
journal_name
Viral Immunoljournal_title
Viral immunologyauthors
Endsley JJ,Quade MJ,Terhaar B,Roth JAdoi
10.1089/08828240260066305subject
Has Abstractpub_date
2002-01-01 00:00:00pages
385-93issue
2eissn
0882-8245issn
1557-8976journal_volume
15pub_type
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