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Journal Article
Research Support, Non-U.S. Gov't
TLR2, TLR3 and TLR5 regulation of pro-inflammatory and pro-labour mediators in human primary myometrial cells.
Journal of Reproductive Immunology 2017 August
Preterm birth continues to be a significant global health care issue, due to our lack of understanding of the mechanisms that drive human labour and delivery. Toll-like receptors (TLRs) are essential in triggering an inflammatory response in human gestational tissues, leading to the production of pro-inflammatory and pro-labour mediators, and thus preterm birth. The aims of this study were to determine whether the adaptor molecules associated with TLR2, TLR3 and TLR5 signalling are involved in human myometrium. Primary human myometrial cells were transfected with siRNA against TIRAP, IRAK1, IRAK4, TAK1and stimulated with bacterial product fsl-1 (TLR2); TRIF, TRADD, TRAF6, RIP1, TAK1 and stimulated with dsRNA viral analogue poly(I:C) (TLR3); IRAK1, IRAK4, TAK1 and stimulated with bacterial product flagellin (TLR5), and assayed for production of pro-inflammatory and pro-labour mediators. Cells transfected with TIRAP, IRAK1, IRAK4 or TAK1 all showed a decrease in fsl-1-induced expression of cytokines (IL-1α, IL-1β, IL-6), chemokines (GRO-α, IL-8, MCP-1), adhesion molecule ICAM-1, cyclooxygenase (COX)-2 mRNA and release of PGF2α and MMP-9 expression. Cells transfected with TRIF, TRAF6, RIP1 or TAK1 all decreased production of poly(I:C)-induced IL-1α, IL-1β, IL-6, GRO-α, IL-8, MCP-1, ICAM-1 and MMP-9 expression. Cells transfected with IRAK1, IRAK4 or TAK1 all showed decreased expression of flagellin-induced cytokine and chemokine expression, ICAM-1 and MMP-9 expression. Lastly, transfection with these siRNAs decreased fsl-1, poly(I:C) and flagellin-induced NF-κB transcriptional activity. Our study signifies that these adaptor molecules are necessary for the proper production of cytokines, chemokines and pro-labour mediators after TLR ligation.
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