Cowpox virus infection induces interleukin-10 (IL-10) production from mouse bone marrow-derived dendritic cells (BMDCs) or cells of the mouse macrophage line (RAW264.7) at about 1800 pg/ml, whereas infections with vaccinia virus (strains WR or MVA) induced much less IL-10. Similarly, in vivo, IL-10 levels in bronchoalveolar lavage fluids of mice infected with cowpox virus were significantly higher than those after vaccinia virus infection. However, after intranasal cowpox virus infection, although dendritic and T-cell accumulations in the lungs of IL-10 deficient mice were greater than those in wild-type mice, weight-loss and viral burdens were not significantly different. IL-10 deficient mice were more susceptible than wild-type mice to re-infection with cowpox virus even though titers of neutralizing antibodies and virus-specific CD8 T cells were similar between IL-10 deficient and wild-type mice. Greater bronchopneumonia in IL-10 deficient mice than wild-type mice suggests that IL-10 contributes to the suppression of immunopathology in the lungs.
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| http://dx.doi.org/10.1016/j.virol.2011.05.010 | DOI Listing |
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