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- W1522366982 abstract "CD4(+) T cells are known to provide support for the activation and expansion of primary CD8(+) T cells, their subsequent differentiation, and ultimately their survival as memory cells. However, the importance of cognate memory CD4(+) T cells in the expansion of memory CD8(+) T cells after re-exposure to Ag has been not been examined in detail. Using bone marrow-derived dendritic cells pulsed with cognate or noncognate MHC class I- and class II-restricted peptides, we examined whether the presence of memory CD4(+) T cells with the same Ag specificity as memory CD8(+) T cells influenced the quantity and quality of the secondary CD8(+) T cell response. After recombinant vaccinia virus-mediated challenge, we demonstrate that, although cognate memory CD4(+) T cells are not required for activation of secondary CD8(+) T cells, their presence enhances the expansion of cognate memory CD8(+) T cells. Cognate CD4(+) T cell help results in an approximate 2-fold increase in the frequency of secondary CD8(+) T cells in secondary lymphoid tissues, and can be accounted for by enhanced proliferation in the secondary CD8(+) T cell population. In addition, cognate memory CD4(+) T cells further selectively enhance secondary CD8(+) T cell infiltration of tumor-associated peripheral tissue, and this is accompanied by increased differentiation into effector phenotype within the secondary CD8(+) T cell population. The consequence of these improvements to the magnitude and phenotype of the secondary CD8(+) T cell response is substantial increase in control of tumor outgrowth." @default.
- W1522366982 created "2016-06-24" @default.
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- W1522366982 date "2007-11-01" @default.
- W1522366982 modified "2023-10-11" @default.
- W1522366982 title "Cognate Memory CD4+ T Cells Generated with Dendritic Cell Priming Influence the Expansion, Trafficking, and Differentiation of Secondary CD8+ T Cells and Enhance Tumor Control" @default.
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- W1522366982 doi "https://doi.org/10.4049/jimmunol.179.9.5829" @default.
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