JOURNAL ARTICLE
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
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MyD88 is critical for the development of innate and adaptive immunity during acute lymphocytic choriomeningitis virus infection.

We investigated the roles of Toll-like receptor 2 (TLR2) and myeloid differentiation factor 88 (MyD88) in the course of a lymphocytic choriomeningitis virus (LCMV) infection and revealed the following: (i) studies of transfected cells and murine peritoneal macrophages demonstrated that TLR2 and MyD88 are essential for the initial pro-inflammatory cytokine response (human IL-8, mouse IL-6) to LCMV; (ii) TLR2 knockout (KO) mice and MyD88 KO mice challenged with LCMV produced less IL-6 and monocyte chemotactic protein-1 in the serum than wild-type mice; (iii) in contrast to inflammatory cytokines, the production of type 1 IFN (IFN-alpha) in response to LCMV was MyD88 independent; (iv) MyD88 plays an essential role in antiviral CD8(+) T cell responses, CD8(+) T cells in MyD88 KO mice were defective in their expression of intracellular antiviral cytokines; and (v) the failure of MyD88 KO mice to activate CD8(+) T cells was accompanied by persistent viral infection in MyD88 KO mice. We demonstrate that TLR-mediated responses are important in the innate immune response to LCMV and that MyD88 is essential for the control of the LCMV infection and the maturation/activation of virus-specific CD8(+) T cells.

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