Abstract
Eimeria bovis infections commonly have clinical impact only on young animals, as homologous reinfections generally are under immunological control. So far, the nature of the immune responses delivering protection to calves has not been investigated. In this study we therefore analysed local and peripheral proliferative T cell activities of primary- and challenge-infected calves and investigated the occurrence of T cell phenotypes in the peripheral blood and in mucosal gut segments isolated either by bioptic means or by necropsies. We show that lymphocytes of E. bovis-infected calves exhibit effective, transient antigen-specific proliferative responses in the course of prepatency of primary infection but fail to react after homologous reinfection suggesting early abrogation of parasite development. Whilst in primary infection an expansion of peripheral CD4+ T cells was observed, reinfection had no effect on the proportions of CD4+, CD8+ subsets or γδTCR+ T cells. In contrast, both E. bovis primary and challenge infections had an impact on local tissue T cell distribution. Primary infection was characterised by a CD4+ T cell infiltration early in prepatency in ileum and later in colon mucosa, whereas CD8+ T cells were only found accumulating in the latter gut segment. Challenge infection led to infiltration of both CD4+ and CD8+ T cells in small intestine and large intestine segments indicating protective functions of both cell types. In contrast, infiltration of ileum and colon mucosa with γδTCR+ T cells was restricted to primary infection.
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Acknowledgements
We acknowledge B. Hofmann and C. Scheld for their excellent technical assistance in cell culture. We also thank K. Failing (Giessen) for support in statistical analyses of the data. This work was supported by the German Research Foundation (DFG; project Za 67/6-1).
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Sühwold, A., Hermosilla, C., Seeger, T. et al. T cell reactions of Eimeria bovis primary- and challenge-infected calves. Parasitol Res 106, 595–605 (2010). https://doi.org/10.1007/s00436-009-1705-5
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DOI: https://doi.org/10.1007/s00436-009-1705-5