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CUTTING EDGE |
Department of Pathology, Emory University School of Medicine, Atlanta, GA 30322
For viruses that establish persistent infection, continuous immunosurveillance by effector-competent antiviral CD8+ T cells is likely essential for limiting viral replication. Although it is well documented that virus-specific memory CD8+ T cells synthesize cytokines after short term in vitro stimulation, there is limited evidence that these T cells exhibit cytotoxicity, the dominant antiviral effector function. Here, we show that antiviral CD8+ T cells in mice acutely infected by polyoma virus, a persistent mouse pathogen, specifically eliminate viral peptide-pulsed donor spleen cells within minutes after adoptive transfer and do so via a perforin-dependent mechanism. Antiviral memory CD8+ T cells were similarly capable of rapidly mobilizing potent Ag-specific cytotoxic activity in vivo. These findings strongly support the concept that a cytotoxic effector-memory CD8+ T cell population operates in vivo to control this persistent viral infection.
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