» Articles » PMID: 38873612

Oropharyngeal Microbial Ecosystem Perturbations Influence the Risk for Acute Respiratory Infections in Common Variable Immunodeficiency

Overview
Journal Front Immunol
Date 2024 Jun 14
PMID 38873612
Authors
Affiliations
Soon will be listed here.
Abstract

Background: The respiratory tract microbiome is essential for human health and well-being and is determined by genetic, lifestyle, and environmental factors. Patients with Common Variable Immunodeficiency (CVID) suffer from respiratory and intestinal tract infections, leading to chronic diseases and increased mortality rates. While CVID patients' gut microbiota have been analyzed, data on the respiratory microbiome ecosystem are limited.

Objective: This study aims to analyze the bacterial composition of the oropharynx of adults with CVID and its link with clinical and immunological features and risk for respiratory acute infections.

Methods: Oropharyngeal samples from 72 CVID adults and 26 controls were collected in a 12-month prospective study. The samples were analyzed by metagenomic bacterial 16S ribosomal RNA sequencing and processed using the Quantitative Insights Into Microbial Ecology (QIME) pipeline. Differentially abundant species were identified and used to build a dysbiosis index. A machine learning model trained on microbial abundance data was used to test the power of microbiome alterations to distinguish between healthy individuals and CVID patients.

Results: Compared to controls, the oropharyngeal microbiome of CVID patients showed lower alpha- and beta-diversity, with a relatively increased abundance of the order , including the family . Intra-CVID analysis identified age >45 years, COPD, lack of IgA, and low residual IgM as associated with a reduced alpha diversity. Expansion of and genera was observed in patients with undetectable IgA and COPD, independent from recent antibiotic use. Patients receiving azithromycin as antibiotic prophylaxis had a higher dysbiosis score. Expansion of and was associated with acute respiratory infections within six months.

Conclusions: CVID patients showed a perturbed oropharynx microbiota enriched with potentially pathogenic bacteria and decreased protective species. Low residual levels of IgA/IgM, chronic lung damage, anti antibiotic prophylaxis contributed to respiratory dysbiosis.

Citing Articles

Linking Microbiota Profiles to Disease Characterization in Common Variable Immunodeficiency: The Case of Granulomatous-Lymphocytic Interstitial Lung Disease.

Cabanero-Navalon M, Carda-Dieguez M, Moral Moral P, Mira A, Balastegui-Martin H, Salavert-Lleti M Biomedicines. 2024; 12(10).

PMID: 39457552 PMC: 11505043. DOI: 10.3390/biomedicines12102239.

References
1.
Castagnoli R, Pala F, Bosticardo M, Licari A, Delmonte O, Villa A . Gut Microbiota-Host Interactions in Inborn Errors of Immunity. Int J Mol Sci. 2021; 22(3). PMC: 7866830. DOI: 10.3390/ijms22031416. View

2.
Schloss P, Westcott S, Ryabin T, Hall J, Hartmann M, Hollister E . Introducing mothur: open-source, platform-independent, community-supported software for describing and comparing microbial communities. Appl Environ Microbiol. 2009; 75(23):7537-41. PMC: 2786419. DOI: 10.1128/AEM.01541-09. View

3.
Amrouche T, Chikindas M . Probiotics for immunomodulation in prevention against respiratory viral infections with special emphasis on COVID-19. AIMS Microbiol. 2022; 8(3):338-356. PMC: 9576497. DOI: 10.3934/microbiol.2022024. View

4.
Pathak J, Yan Y, Zhang Q, Wang L, Ge L . The role of oral microbiome in respiratory health and diseases. Respir Med. 2021; 185:106475. DOI: 10.1016/j.rmed.2021.106475. View

5.
Tiew P, Meldrum O, Chotirmall S . Applying Next-Generation Sequencing and Multi-Omics in Chronic Obstructive Pulmonary Disease. Int J Mol Sci. 2023; 24(3). PMC: 9918109. DOI: 10.3390/ijms24032955. View