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Relationship between Respiratory Microbiome and Systemic Inflammatory Markers in COPD: A Pilot Study.
Carme Casadevall1,2,3, Sara Quero2,4, Laura Millares4,5
1Hospital del Mar Research Institute (IMIM), Parc de Recerca Biomèdica de Barcelona (PRBB), 08003 Barcelona, Spain.
International Journal of Molecular Sciences
|August 10, 2024
Summary
Changes in the respiratory microbiome are linked to systemic inflammation in chronic obstructive pulmonary disease (COPD). Specific bacteria correlate with COPD severity and exacerbations, highlighting the microbiota-inflammation interaction.
Area of Science:
- Pulmonary Medicine
- Microbiology
- Immunology
Background:
- The respiratory microbiome plays a role in chronic obstructive pulmonary disease (COPD) pathogenesis.
- Understanding the link between respiratory bacteria and systemic inflammation in COPD is crucial.
Purpose of the Study:
- To investigate associations between respiratory bacterial abundance and systemic inflammation in COPD patients.
- To explore relationships between the respiratory microbiome and COPD phenotypes.
Main Methods:
- Analysis of inflammatory and eosinophil markers in peripheral blood of 72 stable COPD patients.
- 16S rRNA sequencing of spontaneous sputum to determine respiratory microbiome composition.
- Spearman correlation analysis to assess microbiome-inflammation relationships.
Main Results:
- Plasma IL-8 levels inversely correlated with 17 bacterial genera in the COPD cohort.
- Eosinophilic COPD patients showed associations with blood eosinophil markers, reduced airway obstruction, and fewer exacerbations.
- Frequent exacerbators had increased Pseudomonas abundance, linked to greater airflow limitation and exacerbation history.
Conclusions:
- Respiratory microbiome composition is associated with systemic inflammation in COPD.
- Specific bacterial genera correlate with distinct COPD phenotypes and disease severity.
- The interaction between the sputum microbiome and systemic inflammation is relevant to COPD progression.
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