Abstract
Infection with Leishmania major induces a protective immune response and long-term resistance to reinfection, which is thought to depend upon persistent parasites. Here we demonstrate that although effector CD4+ T cells are lost in the absence of parasites, central memory CD4+ T cells are maintained. Upon secondary infection, these central memory T cells become tissue-homing effector T cells and mediate protection. Thus, immunity to L. major is mediated by at least two distinct populations of CD4+ T cells: short-lived pathogen-dependent effector cells and long-lived pathogen-independent central memory cells. These data suggest that central memory T cells should be the targets for nonlive vaccines against infectious diseases requiring cell-mediated immunity.
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Acknowledgements
We thank K. Joyce for excellent technical assistance, members of the Department of Pathobiology for constructive discussions and D. Artis, C.G. Feng, C.A. Hunter, D. Jankovic, E.J. Pearce, S.L. Reiner, H. Shen and A. Sher for critical reading of the manuscript. This work was supported by US National Institutes of Health grant AI35914 (to P. S.).
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Supplementary information
Supplementary Fig. 1
Homing to LNs is not required for effector T cell function during chronic infection with L. major (PDF 59 kb)
Supplementary Fig. 2
CD4+ T cells mediate infection-induced immunity (PDF 44 kb)
Supplementary Fig. 3
Characterization of CD4+ T cells from naive and immune B6 mice prior to adoptive transfer (PDF 44 kb)
Supplementary Fig. 4
Leishmania-specific IFN-γ and IL-2 responses by CD62Lhigh and CD62Llow CD4+ T cells (PDF 42 kb)
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Zaph, C., Uzonna, J., Beverley, S. et al. Central memory T cells mediate long-term immunity to Leishmania major in the absence of persistent parasites. Nat Med 10, 1104–1110 (2004). https://doi.org/10.1038/nm1108
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DOI: https://doi.org/10.1038/nm1108
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