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Cytotoxic T Lymphocyte Antigen 4 (CD152) Regulates Self-Reactive T cells in BALB/c but not in the Autoimmune NOD Mouse
Ist Teil von
Journal of autoimmunity, 2000-03, Vol.14 (2), p.123-131
Ort / Verlag
London: Elsevier Ltd
Erscheinungsjahr
2000
Link zum Volltext
Quelle
Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)
Beschreibungen/Notizen
Recent studies demonstrated that engagement of cytotoxic T lymphocyte antigen 4 (CTLA-4)/(CD152) generates an inhibitory signal to T cells which arrests an on-going immune response. Since aberrant CD152 activity is thought to contribute to autoimmunity, we examined the effect of CD152-mediated inhibitory signals on the response to self and foreign antigens in autoimmune, diabetes-prone NOD and non-autoimmune BALB/c mice. The interaction of CD152 with its ligand B7 was prevented by treating the mice with anti-CD152 blocking antibody, before and following immunization of the mice with the self-antigen, syngeneic islet cells, or the foreign antigen, key-hole limpet hemocyanin (KLH). CD152 blockade in BALB/c mice stimulated a robust islet-specific T cell-mediated immune response compared to control antibody-treated mice. The augmentation of T cell responses in BALB/c mice was consistent with the role proposed for CD152 as a down-regulator of T cell activation responses. Furthermore, CD152 blockade unmasked islet cell specific autoreactive T cells in the non-autoimmune BALB/c mouse. Conversely, CD152 blockade in NOD mice failed to regulate islet-specific auto-reactive T cell responses. However, CD152 blockade enhanced the T cell response to the exogenous, foreign antigen KLH in both non-autoimmune BALB/c and autoimmune NOD mice. Collectively, these results suggest that there is not a global defect in CD152-mediated regulation of peripheral T cell immune responses in NOD autoimmune mice but rather, a defect specific to T cells recognizing self antigen.