Microbiome diversity, intra-mucosal bacteria and immune integration within normal and asthmatic airway mucosa
Moffatt, M. F.; Nishimura, T.; Cox, M. J.; McBrien, C. N.; Burke, C.; Cuthbertson, L.; Lewis, K. E.; Attanoos, R.; Davies, G. A.; Chung, K. F.; Robertus, J. L.; Ish-Horowicz, J. S.; Carroll, O.; Bozeman, J. M.; McGowan, A.; Hopkin, J. M.; Lathrop, G. M.; Riazalhosseini, Y.; Cookson, W. O.
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Asthma is characterized by reduced bronchial bacterial diversity and airway mucosal disruption. We examined spatial distributions of microbial sequences and host mucosal transcripts in bronchial biopsies from healthy controls and adult asthmatics. Bacteria were discovered by 16S ribosomal RNA staining in the lamina propria of all biopsies, with counts positively associated to lumenal bacterial diversity. Weighted correlation network analysis identified fifteen co-expression networks, including distinct programs of adaptive and innate immunity in differing spatial distributions. Stromal bacterial counts correlated significantly with eight of the network eigenvectors in directions compatible with beneficial relationships. The results suggest that dysbiosis may affect mucosal immunity through impaired interactions beneath the epithelial border. Intra-mucosal companion bacteria may be a potential substrate for selective management of immunity in a wide range of diseases. One-Sentence SummaryThe lung microbiome extends within the airway mucosa and associates spatially and functionally with immune networks.
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