Synergy between viral and bacterial toll-like receptors leads to amplification of inflammatory responses and preterm labor in the mouse.

Biology of Reproduction
Vladimir Ilievski, Emmet Hirsch

Abstract

Toll-like receptors (TLRs) recognize molecular constituents of pathogens and activate host innate immune responses. TLR2 responds to Gram-positive organisms and components of their cell walls. TLR3 responds to double-stranded RNA (an intermediate in viral replication). A mouse macrophage cell line (RAW 264.7) and freshly obtained mouse peritoneal macrophages were treated in tissue culture for 5 or 10 h with either peptidoglycan (PGN; a TLR2 ligand, 1 μg/ml), polyinosinic:cytidylic acid (poly(I:C); a TLR3 ligand, 10 μg/ml), both PGN and poly(I:C), or neither. Total RNA was extracted, and RT-PCR was performed. A mouse model of preterm birth induced by intrauterine injection of TLR ligands was used to test in vivo effects. Compared to stimulation with either PGN or poly(I:C) alone, stimulation of macrophages with both ligands (whether simultaneously or sequentially) resulted in synergistic expression of inflammatory mediators, including inducible nitric oxide synthase, interleukin 1 beta, tumor necrosis factor alpha, and the chemokine CCL5 (RANTES). Using peritoneal macrophages obtained from mutant and control mice, this synergy was determined to be dependent upon TLR2 and the TLR-related intracellular adaptor proteins MYD88 and T...Continue Reading

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Methods Mentioned

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