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- W1777950990 abstract "Summary One of the most prominent changes during T‐cell aging in humans is the accumulation of CD28 null T cells, mainly CD8+ and also CD4+ T cells. Enhancing the functional properties of these cells may be important as they provide an antigen‐specific defense against chronic infections. Recent studies have shown that IL‐15 does in fact play an appreciable role in CD4 memory T cells under physiological conditions. We found that treatment with IL‐15 increased the frequency of elderly CD4+CD28 null T cells by the preferential proliferation of these cells compared to CD4+CD28+ T cells. IL‐15 induced an activated phenotype in CD4+CD28 null T cells. Although the surface expression of IL‐15R α‐chain was not increased, the transcription factor STAT‐5 was preferentially activated. IL‐15 augmented the cytotoxic properties of CD4+CD28 null T cells by increasing both the mRNA transcription and storage of granzyme B and perforin for the cytolytic effector functions. Moreover, pretreatment of CD4+CD28 null T cells with IL‐15 displayed a synergistic effect on the IFN‐γ production in CMV‐specific responses, which was not observed in CD4+CD28+ T cells. IL‐15 could play a role enhancing the effector response of CD4+CD28 null T cells against their specific chronic antigens." @default.
- W1777950990 created "2016-06-24" @default.
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- W1777950990 date "2011-06-27" @default.
- W1777950990 modified "2023-10-17" @default.
- W1777950990 title "IL-15 preferentially enhances functional properties and antigen-specific responses of CD4+CD28<sup>null</sup>compared to CD4+CD28+ T cells" @default.
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- W1777950990 doi "https://doi.org/10.1111/j.1474-9726.2011.00725.x" @default.
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