Memory CD8+ T cells provide essential specific immunity against previously encountered antigens, and formation of such cells is a fundamental goal of vaccination. Our data show that the pre-immune population of CD8 T cells contains cells with memory-like properties, which we call Homeostatic memory (HM) cells. In this proposal we will test how this population of T cells contributes to primary immune responses. Building on our previous data, we will conduct two aims. 1) how the HM pool responds to pathogens early during an immune response, and how these cells may affect pathogen growth or immunopathology that can arise during immune responses. We will also extend data suggesting HM cells differ qualitatively from nave cells in their response to antigen. 2) This aim extends preliminary data suggesting the cytokine IL-4 plays an unexpected role in controlling CD8 T cell responses. We will assess the function of IL- 4 in controlling memory CD8 T cell maintenance, and build on our preliminary data showing that IL-4 supports the CD8 response to pathogens, by determining the stage at which IL-4 mediates its effects.

Public Health Relevance

T cells make up a key part of the immune system, helping to eliminate infections. Vaccines are designed to make 'memory' T cells which 'remember' microbial components and so stop pathogens (damaging infectious agents) early after an infection. Our research has shown that there are memory T cells specific for pathogens present in the immune system even before an animal has been vaccinated - we wish to understand how these cells may offer 'natural' immunity, giving a measure of resistance to pathogens one has never encountered before, and also how these pre-existing memory cells may enhance immune memory after infection.

National Institute of Health (NIH)
National Institute of Allergy and Infectious Diseases (NIAID)
Research Project (R01)
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Immunity and Host Defense (IHD)
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Kelly, Halonna R
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University of Minnesota Twin Cities
Schools of Medicine
United States
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Lee, You Jeong; Starrett, Gabriel J; Lee, Seungeun Thera et al. (2016) Lineage-Specific Effector Signatures of Invariant NKT Cells Are Shared amongst ?? T, Innate Lymphoid, and Th Cells. J Immunol 197:1460-70
Renkema, Kristin R; Lee, June-Yong; Lee, You Jeong et al. (2016) IL-4 sensitivity shapes the peripheral CD8+ T cell pool and response to infection. J Exp Med 213:1319-29
Beura, Lalit K; Hamilton, Sara E; Bi, Kevin et al. (2016) Normalizing the environment recapitulates adult human immune traits in laboratory mice. Nature 532:512-6
Takada, Kensuke; Van Laethem, Francois; Xing, Yan et al. (2015) TCR affinity for thymoproteasome-dependent positively selecting peptides conditions antigen responsiveness in CD8(+) T cells. Nat Immunol 16:1069-76
Lee, You Jeong; Wang, Haiguang; Starrett, Gabriel J et al. (2015) Tissue-Specific Distribution of iNKT Cells Impacts Their Cytokine Response. Immunity 43:566-78
Hogquist, Kristin A; Jameson, Stephen C (2014) The self-obsession of T cells: how TCR signaling thresholds affect fate 'decisions' and effector function. Nat Immunol 15:815-23
Lee, June-Yong; Hamilton, Sara E; Akue, Adovi D et al. (2013) Virtual memory CD8 T cells display unique functional properties. Proc Natl Acad Sci U S A 110:13498-503
Olson, Janelle A; McDonald-Hyman, Cameron; Jameson, Stephen C et al. (2013) Effector-like CD8? T cells in the memory population mediate potent protective immunity. Immunity 38:1250-60
Lee, You Jeong; Holzapfel, Keli L; Zhu, Jinfang et al. (2013) Steady-state production of IL-4 modulates immunity in mouse strains and is determined by lineage diversity of iNKT cells. Nat Immunol 14:1146-54
Akue, Adovi D; Lee, June-Yong; Jameson, Stephen C (2012) Derivation and maintenance of virtual memory CD8 T cells. J Immunol 188:2516-23

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