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Sections of Infectious Diseases and Immunobiology, Yale University School of Medicine, New Haven, CT 06511
Recent studies have demonstrated that viral and bacterial infections can induce dramatic in vivo expansion of Ag-specific T lymphocytes. Although presentation of Ag is critical for activation of naive T cells, it is less clear how dependent subsequent in vivo T cell proliferation and memory generation are upon Ag. We investigated T cell expansion and memory generation in mice infected alternately with strains of Listeria monocytogenes that contained or lacked an immunodominant, MHC class I-restricted T cell epitope. We found substantial differences in the responses of effector and memory T cells to inflammatory stimuli. Although effector T cells undergo in vivo expansion in response to bacterial infection in the absence of Ag, memory T cells show no evidence for such bystander activation. However, Ag-independent expansion of effector T cells does not result in increased memory T cell frequencies, indicating that Ag presentation is critical for effective memory T cell generation. Early reinfection of mice with L. monocytogenes before the maximal primary T cell response induces typical memory expansion, suggesting that the capacity for a memory T cell response exists within the primary effector population. Our findings demonstrate that T cell effector proliferation and memory generation are temporally overlapping processes with differing requirements for Ag.
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