Bacterial Interactions with Aspergillus fumigatus in the Immunocompromised Lung
Anatte Margalit1, James C Carolan1, Kevin Kavanagh1
1Department of Biology, Maynooth University, Manooth W23VP22, Kildare, Ireland.
Abstract:
The immunocompromised airways are susceptible to infections caused by a range of pathogens which increases the opportunity for polymicrobial interactions to occur. Pseudomonas aeruginosa and Staphylococcus aureus are the predominant causes of pulmonary infection for individuals with respiratory disorders such as cystic fibrosis (CF). The spore-forming fungus Aspergillus fumigatus, is most frequently isolated with P. aeruginosa, and co-infection results in poor outcomes for patients. It is therefore clinically important to understand how these pathogens interact with each other and how such interactions may contribute to disease progression so that appropriate therapeutic strategies may be developed. Despite its persistence in the airways throughout the life of a patient, A. fumigatus rarely becomes the dominant pathogen. In vitro interaction studies have revealed remarkable insights into the molecular mechanisms that drive agonistic and antagonistic interactions that occur between A. fumigatus and pulmonary bacterial pathogens such as P. aeruginosa. Crucially, these studies demonstrate that although bacteria may predominate in a competitive environment, A. fumigatus has the capacity to persist and contribute to disease.
Insights
Pseudomonas aeruginosa and Aspergillus fumigatus co-infections in immunocompromised airways are common. Despite bacterial dominance, the fungus persists, impacting disease progression and patient outcomes.
Area of Science:
- Medical Microbiology
- Pulmonary Medicine
- Immunology
Background:
- Immunocompromised airways are prone to polymicrobial infections.
- Pseudomonas aeruginosa and Staphylococcus aureus are leading causes of pulmonary infections in cystic fibrosis (CF).
- Aspergillus fumigatus frequently co-infects with P. aeruginosa, leading to adverse patient outcomes.
Purpose of the Study:
- To investigate the interactions between Aspergillus fumigatus and Pseudomonas aeruginosa in pulmonary infections.
- To understand how these polymicrobial interactions contribute to disease progression.
- To inform the development of effective therapeutic strategies for co-infections.
Main Methods:
- In vitro studies were conducted to analyze the interactions between A. fumigatus and P. aeruginosa.
- Molecular mechanisms driving agonistic and antagonistic interactions were examined.
Main Results:
- Aspergillus fumigatus rarely dominates in polymicrobial infections despite its persistence.
- In vitro studies revealed insights into the molecular interactions between A. fumigatus and P. aeruginosa.
- Bacteria may predominate in competitive environments, but A. fumigatus can persist.
Conclusions:
- Aspergillus fumigatus possesses the capacity to persist in the airways during polymicrobial infections.
- Understanding pathogen interactions is crucial for managing co-infections and improving patient outcomes in respiratory disorders like CF.
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