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• W3091938510 abstract "Summary The heterogeneity of innate immune cells facilitates efficient antigen presentation and immune activation in the presence of pathogens via cooperativity of various cell subsets and cell states but also obscures the contribution of individual antigen presenting cells (APCs) to overall immune response. 1 It has been hypothesized that a small number of APCs, which are more sensitive to the initial pathogen stimulus, are responsible for coordinating neighboring APCs in an effort to share the metabolic strain associated with heightened pathogen sensitivity. 2 In this study, we have identified a temporally-controlled state of dendritic cells (DCs) that demonstrate greater sensitivity to toll-like-receptor (TLR) agonists and secrete the majority of paracrine activating cytokines (TNFα, IL-6…ect). We were able to isolate this distinct population of DCs preferentially phagocytosed the majority of fluorescently labeled, TLR agonist conjugated microparticles (MPs). 3 We call this population First Responder cells (FRs) due to their ability to first uptake the MPs and activate neighboring APCs via paracrine signaling. We show that FRs exist in this state for <3 hours, cycle through this state on a <24-hour timescale and show a distinct mRNA profile. Furthermore, FRs are necessary for generation of adaptive responses both in vitro and in vivo. We also show that we can improve both IgG titers and CD8 responses in vivo by targeting two highly upregulated receptors on FR cells, DAP12 and PRG2. Given the significance of FR involvement in APC activation, this study has broad immunological value because it offers a critical first evaluation of a new APC cell state but also has important translational value for improving vaccine efficacy via FR targeting." @default.
• W3091938510 created "2020-10-15" @default.
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• W3091938510 date "2020-10-08" @default.
• W3091938510 modified "2023-10-17" @default.
• W3091938510 title "Identification, Characterization, and Targeting of a Rare and Temporal Dendritic Cell State that Facilitates Adaptive Immune Responses" @default.
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• W3091938510 doi "https://doi.org/10.1101/2020.10.08.331744" @default.
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