The hemagglutinating activity of Pseudomonas aeruginosa strains isolated from humans and animals
K Wolska1, E Swiderska, A Jakubczak
1Department of Microbiology, Agricultural Faculty, University of Podlasie, Prusa 12, 08-110 Siedlce, Poland. kwolska@ap.siedlce.pl
Abstract:
The presence and type of adhesins occurring in Pseudomonas aeruginosa strains were determined by hemagglutination test with a 3% suspension of normal and trypsin-treated human group A erythrocytes, with or without the addition of sugar inhibitors (D-mannose, D-glucose, L-fucose, D-galactose, D-fructose, lactose, N-acetylneuraminic acid, N-acetylglucosamine and N-acetylgalactosamine). This study showed that a low percentage of Pseudomonas aeruginosa strains caused the agglutination of normal erythrocytes. Trypsin treatment of erythrocytes did not affect the hemagglutinating properties, indicating that hemagglutination was not dependent upon a trypsin-sensitive protein on the erythrocytes surface. Most of the studied strains agglutinated RBCs at 37 degrees C. A great variability in the inhibiting activity on studied strains was observed among the carbohydrates tested. These results demonstrated the predominant role of N-acetylglucosamine, N-acetylgalactosamine and N-acetylneuraminic acid for Pseudomonas aeruginosa adhesion to RBCs.
Insights
Pseudomonas aeruginosa adhesion to red blood cells (RBCs) was investigated using hemagglutination. N-acetylglucosamine, N-acetylgalactosamine, and N-acetylneuraminic acid were identified as key molecules mediating this bacterial adhesion.
Area of Science:
- Microbiology
- Bacteriology
- Adhesion Mechanisms
Background:
- Pseudomonas aeruginosa is an opportunistic pathogen known for its ability to adhere to host cells.
- Understanding the molecular basis of bacterial adhesion is crucial for developing effective treatments.
- Adhesins play a vital role in the initial attachment of bacteria to surfaces.
Purpose of the Study:
- To identify and characterize the adhesins present in Pseudomonas aeruginosa strains.
- To determine the specific carbohydrate interactions involved in Pseudomonas aeruginosa adhesion to human erythrocytes.
Main Methods:
- Hemagglutination assays were performed using human group A erythrocytes (red blood cells).
- Erythrocytes were treated with trypsin to assess the role of surface proteins.
- Various sugar inhibitors, including N-acetylneuraminic acid, N-acetylglucosamine, and N-acetylgalactosamine, were used to identify specific binding interactions.
Main Results:
- A low percentage of Pseudomonas aeruginosa strains agglutinated normal erythrocytes.
- Trypsin treatment of erythrocytes did not alter hemagglutination, suggesting non-proteinaceous interactions.
- N-acetylglucosamine, N-acetylgalactosamine, and N-acetylneuraminic acid significantly inhibited hemagglutination, indicating their predominant role in adhesion.
Conclusions:
- Pseudomonas aeruginosa adhesion to erythrocytes is primarily mediated by interactions with specific carbohydrates.
- N-acetylglucosamine, N-acetylgalactosamine, and N-acetylneuraminic acid are key determinants of Pseudomonas aeruginosa binding to red blood cells.
- These findings provide insights into the adhesin profiles of Pseudomonas aeruginosa and potential targets for therapeutic intervention.
