1. Cell intrinsic characteristics of human cord blood naïve CD4T cells
- Author
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Paula White, Michael I. Nishimura, Makio Iwashima, Alexander Nelson, Ramiah D. Jacks, and Taylor J. Keller
- Subjects
0301 basic medicine ,Adult ,T cell ,Dipeptidyl Peptidase 4 ,Immunology ,Cell ,Lymphocyte Activation ,Umbilical cord ,Article ,Immunophenotyping ,03 medical and health sciences ,Interferon-gamma ,0302 clinical medicine ,Immune system ,Th2 Cells ,Antigen ,Pregnancy ,medicine ,Immune Tolerance ,Immunology and Allergy ,Humans ,Th1-Th2 Balance ,Cells, Cultured ,Effector ,business.industry ,Infant, Newborn ,Fetal Blood ,030104 developmental biology ,medicine.anatomical_structure ,Cord blood ,Interleukin 13 ,Female ,Interleukin-5 ,business ,030215 immunology - Abstract
It has been generally considered that the perinatal immune system is less inflammatory compared to the adult system and type 2 responses predominate perinatal immune responses against antigens. Indeed, previous studies in mice showed that there are cell-intrinsic differences between neonatal and adult CD4 T cells. However, studies on human cord blood and infant blood demonstrated that human perinatal T cells do not produce elevated levels of Th2 cytokines with the exception of IL-13. These data raise the question if human T cells in the perinatal blood fundamentally differ from adult T cells. To decipher differences between human perinatal and adult T cells, we performed a focused comparative analysis on purified naïve CD4 T cells from umbilical cord blood (UCB) and adult peripheral blood. Our data demonstrate naïve CD4 T cells from UCB differ from adult naïve CD4 T cells in surface expression of CD26, dipeptidyl peptidase-4. While only a fraction of effector/memory T cells from adult blood express CD26, practically all T cells from UCB express high levels of CD26. We also determined that Th1/Th2 polarizing conditions induce UCB CD4 T cells to produce higher levels of IFN-γ and IL -5 compared to adult CD4 T cells, respectively. These data demonstrate intrinsic differences between UCB and adult naive CD4 T cells and suggest that human perinatal immune responses involve more complex mechanisms than the previously thought Th2-dominant responses.
- Published
- 2017