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Adhesion of Pseudomonas aeruginosa ocular isolates to mucin
1Cooperative Research Centre for Eye Research and Technology, The University of New South Wales, Sydney, Australia. l.aristoteli@cclru.unsw.edu.au
Abstract:
The purpose of this study was to compare the adhesion of Pseudomonas aeruginosa ocular isolates to mucin. An adhesion assay was developed using biotin-labelled P. aeruginosa strains (two corneal ulcer, two acute red eye, one asymptomatic and one standard strains) incubated with porcine gastric mucin immobilized on a nitrocellulose membrane. The adhesion was semiquantified using densitometry. The results showed that all P. aeruginosa strains tested were able to adhere to mucin to various extents with three strains (one corneal ulcer one acute red eye, one asymptomatic) binding signifcantly greater than the negative control (P < 0.1). Results suggest that ocular strains of P. aeruginosa strains differ in their adhesion to mucin but this did not correlate with the pathogenic origin of the strain. It is concluded that the adhesion of P. aeruginosa strains to mucin alone may not be a principal determinant of pathogenesis but may be a contributing factor along with other bacterial virulence traits.
Insights
Pseudomonas aeruginosa strains from eyes show varied mucin adhesion. This bacterial trait may contribute to eye infections but doesn't solely determine disease severity.
Area of Science:
- Ophthalmology
- Microbiology
- Bacterial Pathogenesis
Background:
- Pseudomonas aeruginosa is a significant cause of bacterial keratitis and ocular infections.
- Mucin plays a crucial role in ocular surface defense and bacterial colonization.
- Understanding bacterial adhesion to mucin is vital for elucidating infection mechanisms.
Purpose of the Study:
- To compare the adhesion capabilities of various Pseudomonas aeruginosa ocular isolates to mucin.
- To investigate potential correlations between mucin adhesion and the pathogenic origin of P. aeruginosa strains.
Main Methods:
- Development of a biotin-labeled P. aeruginosa adhesion assay.
- Incubation of P. aeruginosa strains with immobilized porcine gastric mucin.
- Quantification of bacterial adhesion using densitometry.
Main Results:
- All tested P. aeruginosa strains adhered to mucin with varying degrees.
- Three strains exhibited significantly higher mucin binding compared to the negative control.
- No direct correlation was found between mucin adhesion levels and the clinical source of the P. aeruginosa isolates.
Conclusions:
- Ocular P. aeruginosa strains display differential adhesion to mucin.
- Mucin adhesion alone may not be the primary factor in P. aeruginosa pathogenesis.
- Bacterial adhesion to mucin is likely a contributing factor, alongside other virulence traits.