期刊
JOURNAL OF IMMUNOLOGY
卷 185, 期 10, 页码 5879-5887出版社
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.1001763
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资金
- National Natural Science Foundation of China [30721091]
- National Key Basic Research Program of China [2007CB512403, 2009CB521902]
Interleukin-17A-producing T cells, especially Th17, have been shown to be involved in inflammatory autoimmune diseases and host defense against extracellular infections. However, whether and how IL-17A or IL-17A-producing cells can help protection against intracellular bacteria remains controversial, especially how it regulates the adaptive immunity besides recruitment of neutrophils in the innate immune system. By infecting IL-17A-deficient mice with Listeria monocytogenes, we show in this study that IL-17A is required for the generation of Ag-specific CD8(+) CTL response against primary infection, but not for the generation of memory CD8(+) T cells against secondary challenge. Interestingly, we identify gamma delta T cells, but not conventional CD4(+) Th17 cells, as the main cells for innate IL-17A production during L. monocytogenes infection. Furthermore, gamma delta T cells are found to promote Ag-specific CD8(+) T cell proliferation by enhancing cross-presentation of dendritic cells through IL-17A. Adoptive transfer of Il17a(+/+) gamma delta T cells, but not Il17a(-/-) gamma delta T cells or Il17a(+/+) CD4(+) T cells, were sufficient to recover dendritic cells cross-presentation and defective CD8(+) T cell response in Il17a(-/-) mice. Our findings indicate an important role of infection-inducible IL-17A-producing gamma delta T cells and their derived IL-17A against intracellular bacterial infection, providing a mechanism of IL-17A for regulation of innate and adaptive immunity. The Journal of Immunology, 2010, 185: 5879-5887.
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