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  • Title: Kinetics of dendritic cell activation: impact on priming of TH1, TH2 and nonpolarized T cells.
    Author: Langenkamp A, Messi M, Lanzavecchia A, Sallusto F.
    Journal: Nat Immunol; 2000 Oct; 1(4):311-6. PubMed ID: 11017102.
    Abstract:
    To prime immune responses, dendritic cells (DCs) need to be activated to acquire T cell stimulatory capacity. Although some stimuli trigger interleukin 12 (IL-12) production that leads to T helper cell type I (TH1) polarization, others fail to do so and favor TH2 polarization. We show that after activation by lipopolysaccharide, DCs produced IL-12 only transiently and became refractory to further stimulation. The exhaustion of cytokine production impacted the T cell polarizing process. Soon after stimulation DCs primed strong TH1 responses, whereas at later time points the same cells preferentially primed TH2 and nonpolarized T cells. These findings indicate that during an immune response, T cell priming conditions may change in the lymph nodes, suggesting another mechanism for the regulation of effector and memory T cells.
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