TY - JOUR
T1 - Reactivity of naive CD4+CD25- T cells against gut microflora in healthy mice
AU - Gad, Monika
AU - Lundsgaard, Dorthe
AU - Kjellev, Stine
AU - Kristensen, Nanna N
AU - Seremet, Tina
AU - Straten, Per Thor
AU - Claesson, Mogens H
N1 - Keywords: Animals; Antigens, CD8; CD4-Positive T-Lymphocytes; Cytokines; Female; Flow Cytometry; Intestines; Lymphoid Tissue; Mice; Mice, Inbred BALB C; Mice, Inbred C57BL; Mice, SCID; Receptors, Interleukin-2; Th1 Cells; Th2 Cells; Thymus Gland
PY - 2006
Y1 - 2006
N2 - We have previously shown that conventional as well as germ-free CD4+ T cells depleted of CD25+ cells from the gut-associated lymphoid tissue and the periphery proliferate specifically in response to enterobacterial antigen exposure whereas unfractionated CD4+ T cells are not reactive under these conditions. Here we show that the majority of the enteroantigen-specific CD4+ CD25- T cells are naive cells expressing a CD45RB high, CD62L high and CD44 low phenotype. These cells are also present in the thymus and data from adult thymectomized mice show that they represent late (>6 weeks) thymic emigrants. Upon enteroantigen activation, the CD4+ CD25- T cells secrete IL-4, IL-5, IL-10, granulocyte macrophage colony-stimulating factor, tumor necrosis factor-alpha and IFN-gamma. Clonotype mapping of the TCRBV regions 1-18 of enteroantigen-reactive CD4+ CD25- T cells by TCR clonotype mapping revealed the polyclonal nature of this subset. In conclusion, we have for the first time demonstrated the presence of an evolutionary, functionally conserved subset of CD4+ T cells, which are reactive against enterobacterial antigens. This subset resides both in the thymus and the periphery; it is not dependent on previous antigen experience and represents late thymic emigrants, which by enteroantigen-induced activation express a mixed Th 1-Th 2 phenotype. At homeostatic conditions, CD25+ T cells maintain peripheral tolerance in this CD4+ T cell subset.
AB - We have previously shown that conventional as well as germ-free CD4+ T cells depleted of CD25+ cells from the gut-associated lymphoid tissue and the periphery proliferate specifically in response to enterobacterial antigen exposure whereas unfractionated CD4+ T cells are not reactive under these conditions. Here we show that the majority of the enteroantigen-specific CD4+ CD25- T cells are naive cells expressing a CD45RB high, CD62L high and CD44 low phenotype. These cells are also present in the thymus and data from adult thymectomized mice show that they represent late (>6 weeks) thymic emigrants. Upon enteroantigen activation, the CD4+ CD25- T cells secrete IL-4, IL-5, IL-10, granulocyte macrophage colony-stimulating factor, tumor necrosis factor-alpha and IFN-gamma. Clonotype mapping of the TCRBV regions 1-18 of enteroantigen-reactive CD4+ CD25- T cells by TCR clonotype mapping revealed the polyclonal nature of this subset. In conclusion, we have for the first time demonstrated the presence of an evolutionary, functionally conserved subset of CD4+ T cells, which are reactive against enterobacterial antigens. This subset resides both in the thymus and the periphery; it is not dependent on previous antigen experience and represents late thymic emigrants, which by enteroantigen-induced activation express a mixed Th 1-Th 2 phenotype. At homeostatic conditions, CD25+ T cells maintain peripheral tolerance in this CD4+ T cell subset.
U2 - 10.1093/intimm/dxl018
DO - 10.1093/intimm/dxl018
M3 - Journal article
C2 - 16574668
SN - 0953-8178
VL - 18
SP - 817
EP - 825
JO - International Immunology
JF - International Immunology
IS - 5
ER -