Controlling the Toll road to dendritic cell polarization

The activation of dendritic cells (DC) via Toll‐like receptors (TLRs) plays a decisive role in shaping the outcome of primary immune responses. Following TLR engagement by microbial products, DC migrate from peripheral tissues to lymphoid organs and up‐regulate major histocompatibility complex and costimulatory molecules, acquiring the unique capacity to prime pathogen‐specific, naïve T cells. In addition, DC determine the character of the ensuing immune response by secreting cytokines that drive the development of T cells into T helper cell type 1 (Th1), Th2, or T regulatory effector cells. Three major factors influence the pattern of cytokines released by DC and accordingly, the Th balance: the lineage to which DC belong; the maturation stimulus; and inflammatory mediators present at the site of infection. A major focus of this review is the capacity of DC to integrate these factors and elicit distinct classes of immune responses.

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