Stimulator of IFN gene is critical for induction of IFN-beta during Chlamydia muridarum infection.

The Journal of Immunology : Official Journal of the American Association of Immunologists
Daniel PrantnerUma M Nagarajan

Abstract

Type I IFN signaling has recently been shown to be detrimental to the host during infection with Chlamydia muridarum in both mouse lung and female genital tract. However, the pattern recognition receptor and the signaling pathways involved in chlamydial-induced IFN-beta are unclear. Previous studies have demonstrated no role for TLR4 and a partial role for MyD88 in chlamydial-induced IFN-beta. In this study, we demonstrate that mouse macrophages lacking TLR3, TRIF, TLR7, or TLR9 individually or both TLR4 and MyD88, still induce IFN-beta equivalent to wild type controls, leading to the hypothesis that TLR-independent cytosolic pathogen receptor pathways are crucial for this response. Silencing nucleotide-binding oligomerization domain 1 in HeLa cells partially decreased chlamydial-induced IFN-beta. Independently, small interfering RNA-mediated knockdown of the stimulator of IFN gene (STING) protein in HeLa cells and mouse oviduct epithelial cells significantly decreased IFN-beta mRNA expression, suggesting a critical role for STING in chlamydial-induced IFN-beta induction. Conversely, silencing of mitochondria-associated antiviral signaling proteins and the Rig-I-like receptors, RIG-I, and melanoma differentiation associated pro...Continue Reading

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