Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5673687 | Microbial Pathogenesis | 2017 | 5 Pages |
â¢The ÎlgtF from H. parasuis was constructed and its LOS exhibited an obvious truncation in structure.â¢ÎlgtF-LOS displayed a significantly reduced ability to induce inflammatory cytokines expression.â¢lgtF mediated LOS induction of inflammatory cytokines by regulation NF-κB and MAPKs pathways.
The lgtF gene encodes a glucosyltransferase responsible for adding a glucose to the first sugar of heptose I in the synthesis of lipooligosaccharides (LOS). To study the function of lgtF, we constructed an lgtF mutant (ÎlgtF) from Haemophilus parasuis SC096 using a natural transformation system. A highly purified preparation of LOS from ÎlgtF (ÎlgtF-LOS) exhibited an obvious truncation in structure compared to the LOS of the wild-type SC096 strain (WT-LOS). The ÎlgtF-LOS also displayed a significantly reduced ability to induce inflammatory cytokine mRNA expression of tumor necrosis factor alpha (TNF-α), interleukin-1α (IL-1α), IL-1β, IL-6 and IL-8 in porcine alveolar macrophages (PAMs) in comparison with the WT-LOS. Furthermore, we also found that ÎlgtF-LOS-treated cells had significantly decreased phospho-p65 and phospho-p38, and inhibited IκBα degradation. These findings suggested that the lgtF gene mediated LOS induction of pro-inflammatory cytokines in PAMs by regulating the NF-κB and MAPKs signaling pathways during H. parasuis infection.