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• W2615937942 abstract "Introduction: The transcription factors Eomesodermin (Eomes) and T-bet are thought to play critical roles in CD8+ effector memory T cell development. [1][2] However, the role of Eomes in alloreactive CD8+T cells is not well known. We have previously shown that reduced Eomes expression and upregulation of CTLA4 by CD8+T cells in renal allograft recipient monkeys is associated with attenuation of donor-reactive memory T cell responses and prolonged graft survival.[3] We hypothesized that Eomes expression might be associated with enhanced effector/cytotoxic function by human and non-human primate (NHP) alloreactive CD8+T cells. Methods: Human and NHP Tcells were purified from peripheral blood mononuclear cells (PBMC) and then co-cultured with irradiated T-cell depleted allogeneic PBMC. Allo-activated CD8+T cells were evaluated by flow cytometry for expression of Eomes, T-bet and CTLA4. Proliferation, intracellular cytokines (IL2, INFγ and TNFα), and Granzyme B following allo-activation were also assessed. Results: Non-activated human Eomeshi CD8+ T cells, exhibited higher T-bet expression and comprised more IFNγ+, TNFα+ and granzyme-B+, but less IL-2+ cells than Eomes-/lo cells. Non-activated rhesus Eomeshi CD8+T cells, although exhibited low T-bet expression, comprised more IFNγ+ and IL-2+, equivalent TNFα+, but less granzyme-B+ cells than Eomes-/lo cells. After allo-stimulation human Eomeshi population comprised more IFNγ+, TNFα+ and granzyme-B+ cells and a variable proportion of IL-2+ cells. Rhesus Eomeshi cells comprised more IFNγ+ and TNFα+, but less IL-2+, and a variable proportion of granzyme-B+ cells. Human EomeshiT-bethi CD8+T cells exhibited the highest incidence of IFNγ+TNFα+ cells, while rhesus EomeshiT-betlo CD8+T cells exhibited the highest incidence of IFNγ+TNFα+ cells. Following allo-activation there was an inverse correlation between CTLA4 and Eomes expression in NHP but not in human CD8+ T cells.FIGURE 1: Cytokine production by Eomeshi and Eomes-/lo CD8+ T cells after allo-activation.FIGURE 2: T-bet expression by alloactivated Eomeshi and Eomes-/lo human and rhesus CD8+T cells.Conclusion: These data suggest that alloreactive EomeshiCD8+T cells may potentially correlate with anti-donor effector Tmem after transplantation and that phenotypic and functional differences between human and NHP EomeshiCD8+T cells need to be taken into consideration. Eomes may be an important novel biomarker for distinguishing potent alloreactive effector memory T cells. Yoshihiro Ono. Alan F. Zahorchak. Bala Ramaswami. References: 1. Pearce, E. L. Mullen, A. C. Martins, G. A., et. al. Science. 2003; 302: 1041-1043. 2. Intlekofer, A. M. Takemoto, N. Wherry, E. J., et. al. Nat Immunol. 2005; 6:1236-1244. 3. Ezzelarab, M. B. Lu, L. Guo, H., et. al. Transplantation. 2016; Jan;100(1):91-102." @default.
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• W2615937942 date "2017-05-01" @default.
• W2615937942 modified "2023-10-17" @default.
• W2615937942 title "High Eomesodermin Expression Correlates With Human and Non-Human Primate Alloreactive Effector CD8 + T Cells" @default.
• W2615937942 doi "https://doi.org/10.1097/01.tp.0000520298.13274.d8" @default.
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