Patient samples derived from current exacerbators contained within
the dashed ellipse, and including BX6 are deemed to be the major outliers, having a microbial community composition which is dissimilar to the click here stable and a small proportion of exacerbating patients. Some sample labels have been removed for ease of interpretation. Eleven bacterial taxa, including members of Pseudomonas, Neisseria and Enterobacteriales were associated with the stable clinical Akt inhibitor state. Conversely, 27 taxa were positively correlated with exacerbation, including Burkholderiales, Pasteurellaceae, Streptococcaceae, Xanthomonadaceae, Prevotellaceae and Veillonellaceae as well as other taxa not regarded as pathogens (Propionibacterium, Flavobacteriales and Actinobacteria) (Figure 3). Figure 3 Partial least squares discriminant analysis (PLS-DA) loading plot showing the contributing microbial BB-94 ic50 community members towards the separation of the PLS-DA scores between patients reporting current stability (▲) and sputum from patients reporting a current exacerbation
(▼). PLS1 (R2X = 0.169, R2Y = 0.232, Q2 = 0.0287) and PLS 2 (R2X = 0.107, R2Y = 0.124, Q2 = 0.0601) are given. Taxa deemed clinically relevant (based on those screened during standard culture) are highlighted in blue. Some sample labels have been removed for ease of interpretation. Bacterial community analysis of the lung microbiota from frequently exacerbating patients Analytical models were extended to explore any differences in prior exacerbation history. From the cohort, 59 patients were selected for inclusion in the model. Patients were Cyclic nucleotide phosphodiesterase defined as frequently exacerbating (M1, n = 38 having more than 3 exacerbation events per annum) or stable (M2, n = 23, ≤3 event pa). Analysis of the model showed that 22 patients from M1 and 17 from M2 had bacterial profiles that were similar, despite
exacerbation history (indicated with an ellipse, Figure 4). The remaining 20 patient samples, however, could be stratified between stable and frequent exacerbation states (Figure 4). Further analysis of the overall bacterial community structure between frequent exacerbating (M1) and stable (M2) patients revealed Moraxellaceae, Xanthomonadaceae, Rhodobacteraceae and Staphylococcaceae were positively associated with frequent exacerbation and Campylobacteraceae, Carnobacteriaceae, Corynebacteriaceae, Micrococcaceae, Neisseriaceae and Nocardiaceae were positively associated with stability (Figure 5). Pasteurellaceae, Streptococcaceae, Pseudomonadaceae that were associated with stable patients (Figure 3), were not explanatory factors in this model (covariance between p1 and p2 was close to 0).