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Functional Heterogeneity Of Memory CD4 T Cell Responses In Different Conditions Of Antigen Exposure And Persistence1
A. Harari, F. Vallelian, P. Meylan, G. Pantaleo
Published 2005 · Biology, Medicine
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Memory CD4 T cell responses are functionally and phenotypically heterogeneous. In the present study, memory CD4 T cell responses were analyzed in different models of Ag-specific immune responses differing on Ag exposure and/or persistence. Ag-specific CD4 T cell responses for tetanus toxoid, HSV, EBV, CMV, and HIV-1 were compared. Three distinct patterns of T cell response were observed. A dominant single IL-2 CD4 T cell response was associated with the model in which the Ag can be cleared. Polyfunctional (single IL-2 plus IL-2/IFN-γ plus single IFN-γ) CD4 T cell responses were associated with Ag persistence and low Ag levels. A dominant single IFN-γ CD4 T cell response was associated with the model of Ag persistence and high Ag levels. The results obtained supported the hypothesis that the different patterns observed were substantially influenced by different conditions of Ag exposure and persistence.
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