8 research outputs found
CD8+ T Cell Tolerance to a Tumor-associated Antigen Is Maintained at the Level of Expansion Rather than Effector Function
Full text linkNovel Analogues of Degarelix Incorporating Hydroxy-, Methoxy-, and Pegylated-Urea Moieties at Positions 3, 5, 6 and the N-Terminus. Part III 1,2
No full textExpression of a Tolerizing Tumor Antigen in Peripheral Tissue Does Not Preclude Recovery of High-Affinity CD8 +
No full textStructure−Activity Relationship Studies of Gonadotropin-Releasing Hormone Antagonists Containing S
No full textCD8 � T Cell Tolerance to a Tumor-associated Antigen Is Maintained at the Level of Expansion Rather than Effector Function
Get PDFCD8 � T cell tolerance to self-proteins prevents autoimmunity but represents an obstacle to generating T cell responses to tumor-associated antigens. We have made a T cell receptor (TCR) transgenic mouse specific for a tumor antigen and crossed TCR-TG mice to transgenic mice expressing the tumor antigen in hepatocytes (gag-TG). TCRxgag mice showed no signs of autoimmunity despite persistence of high avidity transgenic CD8 � T cells in the periphery. Peripheral CD8 � T cells expressed phenotypic markers consistent with antigen encounter in vivo and had upregulated the antiapoptotic molecule Bcl-2. TCRxgag cells failed to proliferate in response to antigen but demonstrated cytolytic activity and the ability to produce interferon �. This split tolerance was accompanied by inhibition of Ca 2 � flux, ERK1/2, and Jun kinasephosphorylation, and a block in both interleukin 2 production and response to exogenous interleukin 2. The data suggest that proliferation and expression of specific effector functions characteristic of reactive cells are not necessarily linked in CD8 � T cell tolerance. Key words
