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Updated: Feb 14, 2026
Measuring Phagocytosis of Aspergillus fumigatus Conidia by Human Leukocytes using Flow Cytometry
Published on: December 7, 2019
Elastin increases biofilm and extracellular matrix production of Aspergillus fumigatus
Ildnay de Souza Lima Brandão1, Heloiza Maria da Silva Oliveira-Moraes2, Cristina Maria de Souza Motta3
1Universidade Federal de Pernambuco, Centro de Ciências Biológicas, Departamento de Micologia, Cidade Universitária, PE, Brazil.
Abstract:
Aspergillus fumigatus is an opportunistic saprobe fungus that accounts for 90% of cases of pulmonary aspergillosis in immunosuppressed patients and is known for its angiotropism. When it reaches the respiratory tract, A. fumigatus interacts with structural components and blood vessels of the lungs, such as elastin. To understand the effect of this structural component, we examined the effect of elastin on the production and development of the biofilm of A. fumigatus. In RPMI containing 10mg/mL of elastin, a significant increase (absorbance p<0.0001; dry weight p<0.0001) in the production of biofilm was observed in comparison to when RPMI was used alone, reaching a maximum growth of 18.8mg (dry weight) of biofilm in 72h. In addition, elastin stimulates the production (p=0.0042) of extracellular matrix (ECM) and decreases (p=0.005) the hydrophobicity during the development of the biofilm. These results suggest that elastin plays an important role in the growth of A. fumigatus and that it participates in the formation of thick biofilm.
Insights
Elastin significantly enhances Aspergillus fumigatus biofilm formation and extracellular matrix production in the lungs. This finding is crucial for understanding pulmonary aspergillosis in immunocompromised individuals.
Area of Science:
- Mycology
- Medical Microbiology
- Pulmonary Medicine
Background:
- Aspergillus fumigatus is a major cause of pulmonary aspergillosis in immunocompromised patients.
- A. fumigatus exhibits angiotropism, interacting with lung structures like elastin.
- Understanding fungal-host interactions is key to treating invasive fungal infections.
Purpose of the Study:
- To investigate the impact of elastin on Aspergillus fumigatus biofilm production and development.
- To elucidate the role of elastin in the pathogenesis of pulmonary aspergillosis.
Main Methods:
- Culturing A. fumigatus in RPMI medium with and without 10mg/mL of elastin.
- Quantifying biofilm production using absorbance and dry weight measurements.
- Assessing extracellular matrix (ECM) production and fungal cell surface hydrophobicity.
Main Results:
- A significant increase in A. fumigatus biofilm production was observed in the presence of elastin (p<0.0001).
- Maximum biofilm growth reached 18.8mg (dry weight) within 72 hours.
- Elastin stimulated ECM production (p=0.0042) and decreased hydrophobicity (p=0.005) during biofilm development.
Conclusions:
- Elastin plays a significant role in promoting the growth of A. fumigatus.
- Elastin contributes to the formation of thick biofilms by A. fumigatus.
- These findings highlight elastin as a potential target for managing pulmonary aspergillosis.
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