Activated NKT cells can condition different splenic dendritic cell subsets to respond more effectively to TLR engagement and enhance cross-priming

• Main Authors: Osmond, T. L., Petersen, Troels R., Hermans, Ian F., Farrand, K. J., Painter, G. F., Ruedl, Christiane
• Other Authors: School of Biological Sciences
• Format: Article
• Language: English
• Published: 2015
• Subjects: DRNTU::Science::Biological sciences::Microbiology::Immunology
• Online Access: https://hdl.handle.net/10356/96360; http://hdl.handle.net/10220/38501
• Institution: Nanyang Technological University

The function of dendritic cells (DCs) can be modulated through multiple signals, including recognition of pathogen-associated molecular patterns, as well as signals provided by rapidly activated leukocytes in the local environment, such as innate-like T cells. In this article, we addressed the possibility that the roles of different murine DC subsets in cross-priming CD8+ T cells can change with the nature and timing of activatory stimuli. We show that CD8α+ DCs play a critical role in cross-priming CD8+ T cell responses to circulating proteins that enter the spleen in close temporal association with ligands for TLRs and/or compounds that activate NKT cells. However, if NKT cells are activated first, then CD8α− DCs become conditioned to respond more vigorously to TLR ligation, and if triggered directly, these cells can also contribute to priming of CD8+ T cell responses. In fact, the initial activation of NKT cells can condition multiple DC subsets to respond more effectively to TLR ligation, with plasmacytoid DCs making more IFN-α and both CD8α+ and CD8α− DCs manufacturing more IL-12. These results suggest that different DC subsets can contribute to T cell priming if provided appropriately phased activatory stimuli, an observation that could be factored into the design of more effective vaccines.