alexa Toll-like receptor 6 drives differentiation of tolerogenic dendritic cells and contributes to LcrV-mediated plague pathogenesis.
Pharmaceutical Sciences

Pharmaceutical Sciences

Journal of Clinical & Experimental Pharmacology

Author(s): Depaolo RW, Tang F, Kim I, Han M, Levin N,

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Abstract Educating dendritic cells (DC) to become tolerogenic DC, which promote regulatory IL-10 immune responses, represents an effective immune evasion strategy for pathogens. Yersinia pestis virulence factor LcrV is reported to induce IL-10 production via interaction with Toll-like receptor (TLR) 2. However, TLR2-/- mice are not protected against subcutaneous plague infection. Using complementary in vitro and in vivo approaches and LcrV as a model, we show that TLR6 associates with TLR2 to induce tolerogenic DC and regulatory type-1 T cells selectively secreting IL-10. In contrast, TLR1 heterodimerizes with TLR2 to promote proinflammatory IL-12p40 cytokine, producing DC and inflammatory T cell differentiation. LcrV specifically hijacks the TLR2/6 pathway to stimulate IL-10 production, which blocks host protective inflammatory responses. These results explain why TLR2 can mediate both pro- and anti-inflammatory responses and identify TLR6 as a distinct receptor driving regulatory IL-10 responses.
This article was published in Cell Host Microbe and referenced in Journal of Clinical & Experimental Pharmacology

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