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The Journal of Immunology, 2003, 171: 795-801.
Copyright © 2003 by The American Association of Immunologists

Innate Immunity Together with Duration of Antigen Persistence Regulate Effector T Cell Induction

Tazio Storni, Christiane Ruedl, Wolfgang A. Renner and Martin F. Bachmann1

Cytos Biotechnology, Schlieren-Zurich, Switzerland

Proliferation of T cells is important for the expansion of specific T cell clones during immune responses. In addition, for the establishment of protective immunity against viruses, bacteria, and tumors, the expanded T cells must differentiate into effector T cells. Here we show that effector T cell generation is driven by activation of APCs and duration of antigenic stimulation. Adoptively transferred TCR-transgenic T cells extensively proliferated upon immunization. However, these T cells failed to differentiate into effector cells and died within 1 wk after immunization unless antigenic peptides persisted for >1 day or were presented by activated APCs. The induction of protective immunity in a nontransgenic system was more stringent, since activation of APCs or prolonged Ag persistence alone was not sufficient to drive immunity. In contrast, Ag had to be presented for several days by activated APCs to trigger protective T cell responses. Thus, activation of APCs and duration of Ag presentation together regulate the induction of protective T cell responses.




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