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• W4385491010 abstract "Fusobacterium necrophorum causes bovine hepatic abscess, foot rot, mastitis, and endometritis. The 43 kDa outer membrane protein (43 K OMP) of F. necrophorum is a porin protein that plays an important role in infections by this bacterium, but the biological function and the pathogenesis of this protein are largely unknown. In this study, we investigated the role of the 43 K OMP in bacterial infection of bovine mammary epithelial cells (MAC-T cells) by Tandem Mass Tag proteomic analysis. The RAW264.7 cells were incubated with recombinant 43 K OMP (12.5 μg/mL) for 2 h, 4 h, 6 h, and 12 h, and then the inflammatory related protein and inflammatory cytokine production were measured by Western blot analysis and ELISA, the mRNA expression levels of inflammatory cytokine were measured by Real-Time PCR. Proteomic analysis results demonstrated there were 224 differentially expressed proteins in the MAC-T cells stimulated with the 43 K OMP compared with control, and 118 proteins were upregulated and 106 proteins were downregulated. These differentially expressed proteins were mainly involved in NF-kappa B signaling, bacterial invasion of epithelial cells, cell adhesion, complement and coagulation cascades. The top six differentially expressed proteins were; MMP9, PLAU, STOM, PSMD13, PLAUR, and ITGAV, which were involved in a protein-protein interaction network. Furthermore, TLR/MyD88/NF-κB pathway related proteins and inflammatory cytokines (IL-6, TNF-α, and IL-1β) were assessed by Western blot analysis and ELISA. Results showed the 43 K OMP to enhance the expression of TLR4 protein at 2 h (P < 0.01) and the MyD88 protein at 4 h (P < 0.05) post-stimulation, and to decrease IκBα expression at 4 h, 6 h and 12 h (P < 0.05) post-infection, as well as induce phosphorylation at Ser536 (P < 0.01). Levels of IL-6, IL-1β, and TNF-α in the supernatants of mouse macrophages were increased (P < 0.05), as were mRNA expression levels of IL-6, IL-1β, and TNF-α (P < 0.05), while IL-4 mRNA expression was decreased (P < 0.05). Taken together, these results suggested the important role for 43 K OMP in F. necrophorum infection, promoting the production of pro-inflammatory cytokines (IL-6 and TNF-α) by activation of the TLR/MyD88/NF-κB pathway. These findings provided a theoretical basis for a better understanding of the pathogenesis of F. necrophorum infection." @default.
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• W4385491010 date "2023-08-01" @default.
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• W4385491010 title "The outer membrane protein of Fusobacterium necrophorum, 43K OMP, stimulates inflammatory cytokine production through nuclear factor kappa B activation" @default.
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• W4385491010 doi "https://doi.org/10.1016/j.anaerobe.2023.102768" @default.
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