Pseudomonas aeruginosa virulence factors and immune response during exacerbations and stable phase in bronchiectasis.
Year: 2024
Type: conference-abstract
Abstract: Background: Pseudomonas aeruginosa (PA) virulence factors' impact on immune response in Non-Cystic Fibrosis Bronchiectasis (BE) during stable phase and exacerbations (PExs) remains unstudied. Aim: To compare the immune response of patients and PA virulence factors during stable phase and PExs in patients with BE colonized by PA. Methods: PA strain were prospectively collected from sputum and serum samples of 7 patient during both stable phase and subsequent PExs. PA counts were obtained and reported as logarithmic scale colony forming units per mL (LogCFU/mL). The number of PA strains secreting virulence factors (ExoS, ExoY, Pvds) was analyzed using RT-qPCR. Serum samples were assessed for immunoglobulin levels (mg/dl) and interleukin levels (pg/mL) using ELISA and Luminex technology. The non-parametric Wilcoxon signed-rank test for paired data was performed. Results: PA load did not differ between the stable phase and PExs (Fig A). ExoS production increased non-significantly during PExs (Fig B). Serum levels of IL-6, IL-7, IL-10, and IL-1, as well as IgG1 were higher during PExs compared to stable phase (Fig C and Fig D). Conclusion: Although PA load remained above 4LogCFU/mL in sputum from BE patients regardless of stable phase or PExs, inflammatory cytokine levels increased during PExs. Thus, our data emphasize the importance of targeting not only PA but also inflammation in BE PExs.
Institutions: University of Milan, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Centro de Investigación Biomédica en Red de Enfermedades Respiratorias, Fundació Clínic per a la Recerca Biomèdica, Consorci Institut D'Investigacions Biomediques August Pi I Sunyer, Universitat de Barcelona
Language: English
Subfield: Pulmonary and Respiratory Medicine
Field: Medicine
Domain: Health Sciences
Open Access status: green
OpenAlex ID: W4404101147