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Epigenetic basis of CD4 T cel help for memory CD8 T cell formation

ABSTRACT: We report here the effects of CD4 T cell help during priming on the acquistion of specific epigenetic program by memory CD8 T cells.

ORGANISM(S): Mus musculus

PROVIDER: GSE118159 | GEO | 2019/10/23

REPOSITORIES: GEO

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Transcriptional basis of CD4 T cel help for memory CD8 T cell formation

Project description:CD4+ T-cell help is required for the generation of CD8+ cytotoxic T lymphocyte (CTL) memory. We here reveal how “help” signals delivered during priming impact memory differentiation of CTLs, as informed by genome-wide analyses. “Help” signals promoted the IL-15-dependent maintenance of central memory (TCM) cells. However, they had a much larger impact on the generation of effector memory (TEM) cells and their gene expression program . CD4+ T-cell help created TEM cells that produced Granzyme B and IFNg after antigen-independent recall with IL-12 and IL-18. Furthermore, “helped” memory CTLs expressed the effector program characteristic of “helped” primary CTLs upon recall with MHC class I-restricted antigen only, due to both epigenetic imprinting and sustained mRNA expression of relevant genes . Thus, CD4+ T-cell help delivered during priming creates CD8+ TEM cells with innate and help-independent recall capacities.

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Epigenetic basis of CD4 T cel help for memory CD8 T cell formation

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Transcriptional basis of CD4 T cel help for memory CD8 T cell formation

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Project description:CD4 T cells play critical roles in promoting inflammation and helping immune responses, but knowledge of how memory CD4 T cells are regulated and how they help adaptive immune responses is limited. Using adoptive transfer of virus-specific CD4 T cells, we show that naïve CD4 T cells undergo substantial expansion following viral infection, but can induce lethal TH1-driven inflammation. In contrast, memory CD4 T cells exhibit a biased proliferation of T follicular helper (Tfh) cell subsets that correlate with improved adaptive responses and minimal tissue damage following viral infection. Importantly, our analyses revealed that type I interferon regulates the expansion of naïve CD4 T cells, but does not seem to play a critical role in regulating the expansion of memory CD4 T cells. Moreover, blockade of type I interferon signaling abrogated lethal CD4 T cell inflammation following viral infection. Taken together, these data demonstrate a previously undescribed function for memory CD4 T cells: to help adaptive immunity with minimal harm to the host. These findings are important for rational vaccine design and for improving the safety and efficacy of adoptive T cell therapies against persistent antigens. Primary and memory SMARTA cells were MACS-purified by negative selection (STEMCELL) and then FACS-sorted to 98% purity on a FACS Aria (BD Biosciences) according to congenic marker expression (CD45.1+ for secondary, and CD45.1+ CD45.2+ for primary, CD4 T cell responses).

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Project description:Tissue-resident memory T (Trm) cells provide enhanced protection against infection at mucosal sites. Here we found that CD4(+) T cells are important for the formation of functional lung-resident CD8(+) T cells after influenza virus infection. In the absence of CD4(+) T cells, CD8(+) T cells displayed reduced expression of CD103 (Itgae), were mislocalized away from airway epithelia, and demonstrated an impaired ability to recruit CD8(+) T cells to the lung airways upon heterosubtypic challenge. CD4(+) T cell-derived interferon-γ was necessary for generating lung-resident CD103(+) CD8(+) Trm cells. Furthermore, expression of the transcription factor T-bet was increased in "unhelped" lung Trm cells, and a reduction in T-bet rescued CD103 expression in the absence of CD4(+) T cell help. Thus, CD4(+) T cell-dependent signals are important to limit expression of T-bet and allow for the development of CD103(+) CD8(+) Trm cells in the lung airways following respiratory infection.

| S-EPMC4324721 | biostudies-literature

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