https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50469 Wed 28 Feb 2024 15:49:48 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38877 Wed 23 Feb 2022 10:20:33 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:22120 Haemophilus influenzae (NTHi) is a prevalent bacterium found in a variety of chronic respiratory diseases. The role of this bacterium in the pathogenesis of lung inflammation is not well defined. In this study we examined the effect of NTHi on two important lung inflammatory processes 1), oxidative stress and 2), protease expression. Bronchoalveolar macrophages were obtained from 121 human subjects, blood neutrophils from 15 subjects, and human-lung fibroblast and epithelial cell lines from 16 subjects. Cells were stimulated with NTHi to measure the effect on reactive oxygen species (ROS) production and extracellular trap formation. We also measured the production of the oxidant, 3-nitrotyrosine (3-NT) in the lungs of mice infected with this bacterium. NTHi induced widespread production of 3-NT in mouse lungs. This bacterium induced significantly increased ROS production in human fibroblasts, epithelial cells, macrophages and neutrophils; with the highest levels in the phagocytic cells. In human macrophages NTHi caused a sustained, extracellular production of ROS that increased over time. The production of ROS was associated with the formation of macrophage extracellular trap-like structures which co-expressed the protease metalloproteinase-12. The formation of the macrophage extracellular trap-like structures was markedly inhibited by the addition of DNase. In this study we have demonstrated that NTHi induces lung oxidative stress with macrophage extracellular trap formation and associated protease expression. DNase inhibited the formation of extracellular traps.]]> Wed 11 Apr 2018 15:36:56 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:37467 Mon 11 Jan 2021 16:16:25 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:42611 Fri 26 Aug 2022 14:51:24 AEST ]]>