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Effect of IL-4 on the Development and Function of Memory-like CD8 T Cells in the Peripheral Lymphoid Tissues

  • Hi-Jung Park (Graduate Course of Translational medicine, Seoul National University College of Medicine) ;
  • Ara Lee (Department of Biochemistry, College of Life Science & Biotechnology, Yonsei University) ;
  • Jae-Il Lee (Graduate Course of Translational medicine, Seoul National University College of Medicine) ;
  • Seong Hoe Park (Graduate Course of Translational medicine, Seoul National University College of Medicine) ;
  • Sang-Jun Ha (Department of Biochemistry, College of Life Science & Biotechnology, Yonsei University) ;
  • Kyeong Cheon Jung (Graduate Course of Translational medicine, Seoul National University College of Medicine)
  • Received : 2016.01.15
  • Accepted : 2016.03.31
  • Published : 2016.04.30
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Abstract

Unlike conventional T cells, innate CD8 T cells develop a memory-like phenotype in the thymus and immediately respond upon antigen stimulation, similar to memory T cells. The development of innate CD8 T cells in the thymus is known to require IL-4, which upregulates Eomesodermin (Eomes). These features are similar to that of virtual memory CD8 T cells and IL-4-induced memory-like CD8 T cells generated in the peripheral tissues. However, the relationship between these cell types has not been clearly documented. In the present study, IL-4-induced memory-like CD8 T cells generated in the peripheral tissues were compared with innate CD8 T cells in terms of phenotype and function. When an IL-4/anti-IL-4 antibody complex (IL-4C) was injected into C57BL/6 mice daily for 7 days, the EomeshiCXCR3+ CD8 T cell population was markedly increased in the peripheral lymphoid organs and blood. These cells were generated from naïve CD8 T cells or accumulated via the expansion of pre-existing CD44hiCXCR3+ CD8 T cells. Initially, the majority of these CXCR3+ CD8 T cells expressed low levels of CD44, which was followed by the conversion to the CD44hi phenotype. This conversion was associated with the acquisition of enhanced effector function. After discontinuation of IL-4C treatment, Eomes expression levels gradually decreased in CXCR3+ CD8 T cells. Taken together, the results of this study demonstrate that IL-4-induced memory-like CD8 T cells generated in the peripheral lymphoid tissues are phenotypically and functionally similar to the innate CD8 T cells generated in the thymus.

Keywords

Acknowledgement

This work was supported by a grant of the Korea health Technology R&D Project through the Korea Health Industry Development Institute, funded by the Ministry of Health & Welfare, Republic of Korea (grant number: HI13C0954).

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