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Mycoplasma genitalium is a leading pathogen of nongonoccocal chlamydia-negative urethritis, which has been implicated directly in numerous other genitourinary and extragenitourinary tract pathologies. The pathogenesis of infection is attributed in part to excessive immune responses. M. genitalium-derived lipid-associated membrane proteins (LAMPs) are a mixture of bacterial lipoproteins, exposed at the surface of mycoplasma, that are potent inducers of the host innate immune system. However, the interaction of M. genitalium-derived LAMPs as pathogenic agents with Toll-like receptors (TLRs) and the signaling pathways responsible for active inflammation and NF-kappaB activation have not been fully elucidated. In this study, LAMPs induced the production of tumor necrosis factor alpha (TNF-alpha) and interleukin-6 (IL-6) in a dose-dependent manner. Blocking assays showed that TLR2- and CD14-neutralizing antibodies reduced the expression of TNF-alpha and IL-6 in THP-1 cells. Furthermore, LAMP-induced NF-kappaB activation was increased in 293T cells transfected with TLR2 plasmid. The activity of NF-kappaB was synergically augmented by cotransfected TLR1, TLR6, and CD14. Additionally, LAMPs were shown to inhibit NF-kappaB expression by cotransfection with dominant-negative MyD88 and TLR2 plasmids. These results suggest that M. genitalium-derived LAMPs activate NF-kappaB via TLR1, TLR2, TLR6, and CD14 in a MyD88-dependent pathway.

clinical and vaccine immunology

<i>Mycoplasma genitalium</i>-Derived Lipid-Associated Membrane Proteins Activate NF-κB through Toll-Like Receptors 1, 2, and 6 and CD14 in a MyD88-Dependent Pathway

Mycoplasma genitalium-Derived Lipid-Associated Membrane Proteins Activate NF-κB through Toll-Like Receptors 1, 2, and 6 and CD14 in a MyD88-Dependent Pathway