期刊
VETERINARY RESEARCH
卷 45, 期 -, 页码 -出版社
BMC
DOI: 10.1186/s13567-014-0091-x
关键词
-
资金
- Czech Science Foundation [P502/12/0110]
- Institutional Research Concept of the Institute of Microbiology of the Academy of Sciences of the Czech Republic [v.v.i. RVO 61388971]
Lymphocyte subsets isolated from germ-free piglets experimentally infected with swine influenza virus (SIV), porcine reproductive and respiratory syndrome virus (PRRSV) or porcine circovirus type 2 (PCV2) were studied and the profile of these subsets among these three infections was monitored. Germ-free piglets were used since their response could be directly correlated to the viral infection. Because SIV infections are resolved even by colostrum-deprived neonates whereas PRRSV and PCV2 infections are not, SIV was used as a benchmark for an effectively resolved viral infection. PRRSV caused a large increase in the proportion of lymphocytes at the site of infection and rapid differentiation of B cells leading to a high level of Ig-producing cells but a severe reduction in CD2(-)CD21(+) primed B cells. Unlike SIV and PCV2, PRRSV also caused an increase in terminally differentiated subset of CD2(+)CD8 alpha(+) gamma delta cells and polyclonal expansion of major V beta families suggesting that non-specific helper T cells drive swift B cell activation. Distinct from infections with SIV and PRRSV, PCV2 infection led to the: (a) prevalence of MHC-II+ T cytotoxic cells, (b) restriction of the T helper compartment in the respiratory tract, (c) generation of a high proportion of FoxP3(+) T cells in the blood and (d) selective expansion of IgA and IgE suggesting this virus elicits a mucosal immune response. Our findings suggest that PRRSV and PCV2 may negatively modulate the host immune system by different mechanisms which may explain their persistence.
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