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- W4313365812 abstract "Abstract Natural Killer (NK) cells can develop memory-like features and contribute to long-term immunity in mice and humans. NK cells are critical for protection against acute T. gondii infection. However, whether they contribute to long-term immunity in response to this parasite is unknown. We used a vaccine challenge model of parasite infection to address this question and to define the mechanism by which NK cells are activated during secondary parasite infection. We found NK cells were required for control of secondary infection. NK cells increased in number at the infection site, became cytotoxic and produced IFNγ. Adoptive transfer and NK-cell fate mapping revealed that T. gondii-experienced NK cells were not intrinsically different from naïve NK cells with respect to their long-term persistence and ability to protect. Thus, they did not develop memory-like characteristics. Instead, a cell-extrinsic mechanism may control protective NK-cell responses during secondary infection. To test the involvement of a cell-extrinsic mechanism, we used anti-IL-12p70 depletion and IL-12p35−/− mice and found that the secondary NK-cell response was not fully dependent on IL-12. IL-23 depletion with anti-IL-23p19 in vivo significantly reduced the secondary NK-cell response, suggesting that both IL-12 and IL-23 were involved. Anti-IL-12p40 treatment, which blocks both IL-12 and IL-23, eliminated the protective secondary NK-cell response, supporting this hypothesis. Our results define a previously unknown protective role for NK cells during secondary T. gondii infection that is dependent on both IL-12 and IL-23." @default.
- W4313365812 created "2023-01-06" @default.
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- W4313365812 date "2019-05-01" @default.
- W4313365812 modified "2023-09-26" @default.
- W4313365812 title "THE IL-12- AND IL-23-DEPENDENT NK-CELL RESPONSE IS ESSENTIAL FOR PROTECTIVE IMMUNITY AGAINST SECONDARY <i>TOXOPLASMA GONDII</i> INFECTION" @default.
- W4313365812 doi "https://doi.org/10.4049/jimmunol.202.supp.190.73" @default.
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