Material properties of interfacial films of mucoid and nonmucoid Pseudomonas aeruginosa isolates
| Autor: | Jan Kierfeld, Jonas Hegemann, Sricharani Rao Balmuri, Nicholas G. Waters, Tagbo H.R. Niepa |
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| Rok vydání: | 2020 |
| Předmět: |
congenital
hereditary and neonatal diseases and abnormalities Cystic Fibrosis 0206 medical engineering Biomedical Engineering 02 engineering and technology medicine.disease_cause Biochemistry Viscoelasticity Biomaterials Rheology Ultimate tensile strength medicine Humans Pseudomonas Infections Molecular Biology Lung biology Strain (chemistry) Chemistry Pseudomonas aeruginosa Biofilm General Medicine 021001 nanoscience & nanotechnology biology.organism_classification 020601 biomedical engineering digestive system diseases Lung airways respiratory tract diseases Biofilms Biophysics 0210 nano-technology Material properties Bacteria Biotechnology |
| Zdroj: | Acta biomaterialia. 118 |
| ISSN: | 1878-7568 |
| Popis: | Chronic lung infection with bacterial biofilms is a leading cause of death in cystic fibrosis (CF) patients. Pseudomonas aeruginosa, one of the many species colonizing the lung airways, can undergo pathoadaptation, leading to a mucoid phenotype with interesting material properties. We hypothesize that the surface properties and extracellular materials of mucoid P. aeruginosa cells greatly influence the mechanical behavior of their films at fluid interfaces. In this study, we investigate the interfacial properties of films formed by nonmucoid (PANT) and mucoid (PASL) strains of P. aeruginosa isolated from CF patients. We use pendant drop elastometry to analyze the interfacial response of the films formed by PANT and PASL at the hexadecane-water interface. The dynamic rheological analyses of the films highlight the distinctive signature of the mucoid strains at fluid interfaces. The mucoid films exhibit greater relaxation following a compressive strain than a tensile one, while a full hysteresis response is achieved by the nonmucoid films; this indicates that the material properties of the PANT films are conserved under both compression and tension. The wrinkling and shape analyses of the interfacial bacterial films elucidate that the mucoid strain exhibits remarkable viscoelastic properties, enabling the remodeling of the living films and dissipation of the compressive stress. The comparative analysis of the material properties of mucoid and nonmucoid P. aeruginosa cells indicates that mucoid switch can play an important role in protecting the bacteria from interfacial stresses. Further characterization of interfacial bacterial films will provide new insights into the development of methods for controlling interfacial films of bacteria. |
| Databáze: | OpenAIRE |
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