Lookup NU author(s): Dr James Garnett
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Diabetes is associated with increased frequency of hospitalization due to bacterial lung infection. We hypothesize that increased airway glucose caused by hyperglycaemia leads to increased bacterial loads. In critical care patients, we observed that respiratory tract bacterial colonisation is significantly more likely when blood glucose is high. We engineered mutants in genes affecting glucose uptake and metabolism (oprB, gltK, gtrS and glk) in Pseudomonas aeruginosa, strain PAO1. These mutants displayed attenuated growth in minimal medium supplemented with glucose as the sole carbon source. The effect of glucose on growth in vivo was tested using streptozocin-induced, hyperglycaemic mice, which have significantly greater airway glucose. Bacterial burden in hyperglycaemic animals was greater than control animals when infected with wild type but not mutant PAO1. Metformin pre-treatment of hyperglycaemic animals reduced both airway glucose and bacterial load. These data support airway glucose as a critical determinant of increased bacterial load during diabetes.
Author(s): Gill SK, Hui K, Farne H, Garnett JP, Baines DL, Moore LS, Holmes AH, Filloux A, Tregoning JS
Publication type: Article
Publication status: Published
Journal: Scientific Reports
Online publication date: 08/06/2016
Acceptance date: 19/05/2016
ISSN (electronic): 2045-2322
Publisher: Nature Publishing Group
PubMed id: 27273266
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