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CUTTING EDGE |
Department of Neuropharmacology, The Scripps Research Institute, La Jolla, CA 92037
Virus-specific CD8+ T cells produce IFN-
after Ag contact and, in the absence of this cytokine, the host often cannot eradicate infection. However, our ability to identify cells that are actively expressing this critical effector function in vivo is limited, because the protein is rapidly secreted. In this study, we describe a simple approach that circumvents the need for ex vivo Ag stimulation and allows the enumeration of CD8+ T cells that are actively synthesizing IFN- in vivo during primary and secondary virus infections. The proportion of Ag-specific primary CD8+ T cells producing IFN- peaks at 5 days postinfection, when the T cell population is still expanding exponentially. In vivo IFN- synthesis by memory cells is explosive, peaking at 
12 h after secondary infection and terminating hours thereafter. This technique will be useful when evaluating in vivo immune cell activity in many situations, including a variety of noninfectious (e.g., autoimmune) diseases.
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