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• W2149558380 endingPage "350" @default.
• W2149558380 startingPage "340" @default.
• W2149558380 abstract "Exposure to the environmental contaminant 2,3,7, 8-tetrachlorodibenzo-p-dioxin (TCDD) suppresses the generation of T cell-dependent immunity, both humoral and cell-mediated. However, the mechanism of TCDD-induced immune suppression remains to be defined. We hypothesized that exposure to TCDD suppresses the activation of naive CD4(+) T cells and prevents their expansion and differentiation into effector T-helper cells capable of driving T cell-dependent immune responses. To test this hypothesis, we adoptively-transferred DO11.10 OVA-specific T-cell receptor (TCR) transgenic T cells into syngeneic recipients and used a TCR-specific monoclonal antibody to track the in vivo activation of naive CD4(+) T lymphocytes following exposure to OVA. The production of OVA-specific antibodies was suppressed in a dose-dependent manner in adoptively transferred mice that had been exposed to TCDD. Although TCDD exposure had little effect on the expansion or activation of the adoptively transferred, OVA-specific CD4(+) T cells, these cells disappeared from the spleen more rapidly in TCDD-treated mice and produced significantly decreased levels of the T cell-derived cytokines IL-2 and IL-10. There was also a trend towards reduced IFN-gamma and IL-4 production following in vitro re-stimulation. These data suggest that TCDD may interfere with the survival and/or differentiation of OVA-specific T-helper cells. These results demonstrate for the first time the potential of the DO11.10 adoptive transfer system to directly assess immunotoxic effects of xenobiotics on antigen-specific CD4(+) T cells in vivo." @default.
• W2149558380 created "2016-06-24" @default.
• W2149558380 creator A5024583408 @default.
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• W2149558380 date "2000-08-01" @default.
• W2149558380 modified "2023-10-18" @default.
• W2149558380 title "The Effects of TCDD on the Activation of Ovalbumin (OVA)-Specific DO11.10 Transgenic CD4+ T cells in Adoptively Transferred Mice" @default.
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• W2149558380 doi "https://doi.org/10.1093/toxsci/56.2.340" @default.
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