IL-15 is required for sustained lymphopenia-driven proliferation and accumulation of CD8 T cells
| Autor: | Michelle M. Sandau, Colleen J. Winstead, Stephen C. Jameson |
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| Předmět: |
Time Factors
medicine.medical_treatment Immunology Mice Transgenic Endogeny CD8-Positive T-Lymphocytes Biology Lymphocyte Activation Resting Phase Cell Cycle Immunophenotyping Mice Lymphopenia medicine T-cell lymphopenia Animals Immunology and Allergy Cytotoxic T cell Cell Aggregation Cell Proliferation Interleukin-15 Mice Knockout Cell biology Mice Inbred C57BL stomatognathic diseases Cytokine Interleukin 15 Immunologic Memory Homeostasis |
| Zdroj: | ResearcherID |
| Popis: | Naive T cells undergo slow homeostatic proliferation in response to T cell lymphopenia, which is also called lymphopenia-induced proliferation (LIP). IL-7 is critically required for this process, but previous studies suggested IL-15 was expendable for LIP of naive CD8 T cells. In contrast, we show that IL-15 is important for sustained CD8 T cell proliferation and accumulation in a lymphopenic setting, as revealed by truncated LIP in IL-15−/− hosts. At the same time, we find that IL-12 enhances LIP by acting directly on the CD8 T cells and independently of IL-15, suggesting distinct pathways by which cytokines can regulate homeostatic proliferation. Interestingly, the memory-phenotype CD8 T cell generated by LIP in IL-15−/− hosts are phenotypically distinct from the rare endogenous memory-phenotype cells found in IL-15−/− animals, suggesting these cells are generated by different means. These findings demonstrate that cytokine requirements for LIP change during the process itself, illustrating the need to identify factors that regulate successive stages of lymphopenia-driven proliferation. |
| Databáze: | OpenAIRE |
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