Rectal microbiota are coupled with altered cytokine production capacity following community-acquired pneumonia hospitalization

• Published in: iScience Vol. 25; no. 8; p. 104740
• Main Authors: Kullberg, Robert F.J., Brands, Xanthe, Klarenbeek, Augustijn M., Butler, Joe M., Otto, Natasja A., Faber, Daniël R., Scicluna, Brendon P., van der Poll, Tom, Wiersinga, W. Joost, Haak, Bastiaan W.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 19.08.2022; Elsevier
• Subjects: Immunology; Microbiology; Microbiome; Microbiology; Immunology; Microbiome
• ISSN: 2589-0042; 2589-0042
• DOI: 10.1016/j.isci.2022.104740

Human studies describing the immunomodulatory role of the intestinal microbiota in systemic infections are lacking. Here, we sought to relate microbiota profiles from 115 patients with community-acquired pneumonia (CAP), both on hospital admission and following discharge, to concurrent circulating monocyte and neutrophil function. Rectal microbiota composition did not explain variation in cytokine responses in acute CAP (median 0%, IQR 0.0%–1.9%), but did one month following hospitalization (median 4.1%, IQR 0.0%–6.6%, p = 0.0035). Gene expression analysis of monocytes showed that undisrupted microbiota profiles following hospitalization were associated with upregulated interferon, interleukin-10, and G-protein-coupled-receptor-ligand-binding pathways. While CAP is characterized by profoundly distorted gut microbiota, the effects of these disruptions on cytokine responses and transcriptional profiles during acute infection were absent or modest. However, rectal microbiota were related to altered cytokine responses one month following CAP hospitalization, which may provide insights into potential mechanisms contributing to the high risk of recurrent infections following hospitalization. [Display omitted] •Rectal microbiota are disrupted at hospitalization for CAP and one month thereafter•No variation in cytokines is explained by gut microbiota in the acute phase of CAP•Following recovery, gut microbiota are linked with variation in cytokine responses Immunology; Microbiology; Microbiome.