Indiscriminate Memories during Infection Control

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Indiscriminate Memories during Infection Control Sammy Bedoui, Francis R. Carbone  Immunity  Volume 37, Issue 3, Pages 445-446 (September 2012) DOI: 10.1016/j.immuni.2012.09.003 Copyright © 2012 Elsevier Inc. Terms and Conditions

Figure 1 Innate Activation of Memory CD8+ T Cells and NK Cells by Ly6C+CD11b+ Monocytes during Inflammation Monocytes are recruited from the bone marrow to sites of inflammation and/or infection in a CCR2-dependent manner and differentiate into CD11b+Ly6C+ inflammatory monocytes. Through mechanisms that probably involve the recognition of conserved microbial fragments through caspase-1-dependent pattern recognition receptors and activators of IRF-3, inflammatory monocytes secrete bioactive IL-18 and transpresent IL-15 to memory CD8+ T cells and NK cells. Ligation of the IL-18 receptor evokes the production of IFN-γ, and recognition of IL-15 upregulates GrB expression by these lymphocytes. Although this innate activation of memory CD8+ T cells and NK cells contributes to antibacterial immunity, it remains to be resolved whether this is mediated solely by IFN-γ and/or GrB or whether other molecules are also involved. Immunity 2012 37, 445-446DOI: (10.1016/j.immuni.2012.09.003) Copyright © 2012 Elsevier Inc. Terms and Conditions