Two distinct populations of Bovine IL-17+ T-cells can be induced and WC1+IL-17+γδ T-cells are effective killers of protozoan parasites

Peckham, R.K.; Brill, R.; Foster, David S.; Bowen, A.L.; Leigh, James A.; Coffey, Tracey J.; Flynn, Robin J.

Abstract

IL-17 has emerged as a key player in the immune system, exhibiting roles in protection from infectious diseases and promoting inflammation in autoimmunity. Initially thought to be CD4 T-cell-derived, the sources of IL-17 are now known to be varied and belong to both the innate and adaptive arms of the immune system. Mechanisms for inducing IL-17 production in lymphoid cells are thought to rely on appropriate antigenic stimulation in the context of TGF-β1, IL-6 and/or IL-1β. Using culture protocols adapted from human studies, we have effectively induced both bovine CD4+ and WC1+ γδ T-cells to produce IL-17 termed Th17 and γδ17 cells, respectively. The negative regulatory effect of IFN-γ on mouse and human IL-17 production can be extended to the bovine model, as addition of IFN-γ decreases IL-17 production in both cell types. Furthermore we show that infection with the protozoan Neospora caninum will induce fibroblasts to secrete pro-IL-17 factors thereby inducing a γδ17 phenotype that preferentially kills infected target cells. Our study identifies two T-cell sources of IL-17, and is the first to demonstrate a protective effect of IL-17+ T-cells in ruminants. Our findings offer further opportunities for future adjuvants or vaccines which could benefit from inducing these responses.

Citation

Peckham, R., Brill, R., Foster, D. S., Bowen, A., Leigh, J. A., Coffey, T. J., & Flynn, R. J. (2014). Two distinct populations of Bovine IL-17+ T-cells can be induced and WC1+IL-17+γδ T-cells are effective killers of protozoan parasites. Scientific Reports, 4, Article 5431. https://doi.org/10.1038/srep05431

• Journal Article Type: Article
• Acceptance Date: Jun 5, 2014
• Online Publication Date: Jun 25, 2014
• Publication Date: Jun 25, 2014
• Deposit Date: Oct 31, 2016
• Publicly Available Date: Oct 31, 2016
• Journal: Scientific Reports
• Electronic ISSN: 2045-2322
• Publisher: Nature Publishing Group
• Peer Reviewed: Peer Reviewed
• Volume: 4
• Article Number: 5431
• DOI: https://doi.org/10.1038/srep05431
• Public URL: https://nottingham-repository.worktribe.com/output/730133
• Publisher URL: http://www.nature.com/articles/srep05431
• Contract Date: Oct 31, 2016