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Protective antifungal memory CD8+ T cells are maintained in the absence of CD4+ T cell help and cognate antigen in mice
Som G. Nanjappa, … , Thomas Sullivan, Bruce Klein
Som G. Nanjappa, … , Thomas Sullivan, Bruce Klein
Published February 22, 2012
Citation Information: J Clin Invest. 2012;122(3):987-999. https://doi.org/10.1172/JCI58762.
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Research Article Immunology Article has an altmetric score of 6

Protective antifungal memory CD8+ T cells are maintained in the absence of CD4+ T cell help and cognate antigen in mice

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Abstract

Individuals who are immunocompromised, including AIDS patients with few CD4+ T cells, are at increased risk for opportunistic fungal infections. The incidence of such infections is increasing worldwide, meaning that the need for antifungal vaccines is increasing. Although CD4+ T cells play a dominant role in resistance to many pathogenic fungal infections, we have previously shown that vaccination can induce protective antifungal CD8+ T cell immunity in the absence of CD4+ T cells. However, it has not been determined whether vaccine-induced antifungal CD8+ T cell memory can be maintained in the absence of CD4+ T cell help. Here, we have shown in a mouse model of vaccination against blastomycosis that antifungal memory CD8+ T cells are maintained in the absence of CD4+ T cells without loss of numbers or function for at least 6 months and that the cells protect against infection. Using a system that enabled us to induce and track antigen-specific, antifungal CD8+ T cells, we found that such cells were maintained for at least 5 months upon transfer into naive mice lacking both CD4+ T cells and persistent fungal antigen. Additionally, fungal vaccination induced a profile of transcription factors functionally linked with persistent memory in CD8+ T cells. Thus, unlike bacteria and viruses, fungi elicit long-term CD8+ T cell memory that is maintained without CD4+ T cell help or persistent antigen. This has implications for the development of novel antifungal vaccine strategies effective in immunocompromised patients.

Authors

Som G. Nanjappa, Erika Heninger, Marcel Wüthrich, Thomas Sullivan, Bruce Klein

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Figure 6

Maintenance of protective antifungal memory CD8+ T cells without vaccine antigen or CD4+ T cell help.

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Maintenance of protective antifungal memory CD8+ T cells without vaccine...
Recall to the lung of antifungal memory OT-I T cells (A) and polyclonal endogenous CD8+ T cells (B). Cell transfer and vaccination were done as described in Figure 5. The groups of recipient mice were challenged i.t. with 1 × 104 SIINFEKL-expressing yeast. On day 4 after challenge, lungs were harvested to enumerate activated and IFN-γ–producing antifungal CD8+ T cells by flow cytometry. Data are from 4 mice/group. Error bars represent mean ± SD. (C) Resistance to infection. CD4+ T cells were depleted from vaccinated mice using GK1.5. Two weeks after vaccination was complete, CD8+ T cells from spleens and DLNs were collected and pooled. Equal numbers of CD8+ T cells were transferred into naive CD4+ T cell–sufficient, CD4+ T cell–depleted and Cd4–/– mice. Approximately 75 days later, these mice and naive controls that received no cell transfer were lethally challenged with WT yeast. 15 days later, lung CFUs were assessed. Data are shown as box and whisker plots. n = 9–16 mice per group. *P < 0.05; **P < 0.01; ***P < 0.001. In C, the comparisons are between groups that did or did not receive cell transfer, unless indicated.

Copyright © 2025 American Society for Clinical Investigation
ISSN: 0021-9738 (print), 1558-8238 (online)

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