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Science 23 January 2009:
Vol. 323. no. 5913, pp. 505 - 509
DOI: 10.1126/science.1166831
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Reports

Secondary Replicative Function of CD8+ T Cells That Had Developed an Effector Phenotype

Oliver Bannard, Matthew Kraman, Douglas T. Fearon*

Models of the differentiation of memory CD8+ T cells that replicate during secondary infections differ over whether such cells had acquired effector function during primary infections. We created a transgenic mouse line that permits mapping of the fate of granzyme B (gzmB)–expressing CD8+ T cells and their progeny by indelibly marking them with enhanced yellow fluorescent protein (EYFP). Virus-specific CD8+ T cells express gzmB within the first 2 days of a primary response to infection with influenza, without impairment of continued primary clonal expansion. On secondary infection, virus-specific CD8+ T cells that became EYFP+ during a primary infection clonally expand as well as all virus-specific CD8+ T cells. Thus, CD8+ T cells that have acquired an effector phenotype during primary infection may function as memory cells with replicative function.

Wellcome Trust Immunology Unit, Department of Medicine, University of Cambridge, Medical Research Council Centre, Hills Road, Cambridge CB2 2QH, UK.

* To whom correspondence should be addressed. E-mail: dtf1000{at}cam.ac.uk

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
A Default Pathway of Memory CD8 T Cell Differentiation after Dendritic Cell Immunization Is Deflected by Encounter with Inflammatory Cytokines during Antigen-Driven Proliferation.
N.-L. L. Pham, V. P. Badovinac, and J. T. Harty (2009)
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IL-7 Receptor Expression Provides the Potential for Long-Term Survival of Both CD62Lhigh Central Memory T Cells and Th1 Effector Cells during Leishmania major Infection.
S. L. Colpitts, N. M. Dalton, and P. Scott (2009)
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