| Title: | Influence of bacterial and alveolar cell co-culture on microbial VOC production using HS-GC/MS |
| Author(s): | Fenn D; Ahmed WM; Lilien TA; Kos R; Tuip de Boer AM; Fowler SJ; Schultz MJ; Maitland-van der Zee AH; Brinkman P; Bos LDJ; |
| Address: | "Department of Pulmonary medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands. Laboratory of Experimental Intensive Care and Anaesthesiology, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands. Division of Immunology, Immunity to Infection and Respiratory Medicine, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom. NIHR-Manchester Biomedical Research Centre, Manchester University Hospitals NHS Foundation Trust, Amsterdam, United Kingdom. Paediatric Intensive Care Unit, Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands. Intensive Care, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands" |
| DOI: | 10.3389/fmolb.2023.1160106 |
| ISSN/ISBN: | 2296-889X (Print) 2296-889X (Electronic) 2296-889X (Linking) |
| Abstract: | "Volatile organic compounds (VOCs) found in exhaled breath continue to garner interest as an alternative diagnostic tool in pulmonary infections yet, their clinical integration remains a challenge with difficulties in translating identified biomarkers. Alterations in bacterial metabolism secondary to host nutritional availability may explain this but is often inadequately modelled in vitro. The influence of more clinically relevant nutrients on VOC production for two common respiratory pathogens was investigated. VOCs from Staphylococcus aureus (S.aureus) and Pseudomonas aeruginosa (P.aeruginosa) cultured with and without human alveolar A549 epithelial cells were analyzed using headspace extraction coupled with gas chromatography-mass spectrometry. Untargeted and targeted analyses were performed, volatile molecules identified from published data, and the differences in VOC production evaluated. Principal component analysis (PCA) could differentiate alveolar cells from either S. aureus or P. aeruginosa when cultured in isolation based on PC1 (p = 0.0017 and 0.0498, respectively). However, this separation was lost for S. aureus (p = 0.31) but not for P. aeruginosa (p = 0.028) when they were cultured with alveolar cells. S. aureus cultured with alveolar cells led to higher concentrations of two candidate biomarkers, 3-methyl-1-butanol (p = 0.001) and 3-methylbutanal (p = 0.002) when compared to S. aureus, alone. P. aeruginosa metabolism resulted in less generation of pathogen-associated VOCs when co-cultured with alveolar cells compared to culturing in isolation. VOC biomarkers previously considered indicative of bacterial presence are influenced by the local nutritional environment and this should be considered when evaluating their biochemical origin" |
| Keywords: | Hs-gc/ms Voc bacterial VOCs co-culture model culture media composition; |
| Notes: | "PubMed-not-MEDLINEFenn, Dominic Ahmed, Waqar M Lilien, Thijs A Kos, Renate Tuip de Boer, Anita M Fowler, Stephen J Schultz, Marcus J Maitland-van der Zee, Anke H Brinkman, Paul Bos, Lieuwe D J eng Switzerland 2023/05/14 Front Mol Biosci. 2023 Apr 26; 10:1160106. doi: 10.3389/fmolb.2023.1160106. eCollection 2023" |
