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Binding of Haemophilus ducreyi to extracellular matrix proteins
D Abeck1, A P Johnson, H Mensing
1Department of Dermatology, Universitäts-Krankenhaus Eppendorf, Hamburg, Germany.
Abstract:
A collection of Haemophilus ducreyi isolates were screened for the ability to bind to fibrinogen, fibronectin, collagen, gelatin and laminin by a particle agglutination test using latex beads coated with the individual proteins. Thirteen of 21 isolates reacted with all five extracellular matrix proteins. Binding of organisms to protein-coated latex beads was inhibited by pretreatment of the bacteria with detergent, trypsin or boiling. Two isolates did not bind to collagen and gelatin with one of these not reacting with laminin either. Seven strains which failed to react with laminin did not express pili when examined by electron microscopy. This observation suggests a specific interaction with the pili of H. ducreyi.
Insights
Most Haemophilus ducreyi bacteria can bind to extracellular matrix proteins like collagen and fibronectin. This binding interaction may involve the bacteria
Area of Science:
- Microbiology
- Bacterial Pathogenesis
- Extracellular Matrix Interactions
Background:
- Haemophilus ducreyi is a Gram-negative bacterium responsible for chancroid.
- Understanding bacterial adhesion mechanisms is crucial for deciphering pathogenesis.
- Extracellular matrix proteins play a role in bacterial colonization and infection.
Purpose of the Study:
- To investigate the binding capabilities of Haemophilus ducreyi isolates to various extracellular matrix proteins.
- To explore the potential role of bacterial pili in this adhesion process.
Main Methods:
- A particle agglutination test was employed using latex beads coated with fibrinogen, fibronectin, collagen, gelatin, and laminin.
- Twenty-one Haemophilus ducreyi isolates were screened for protein binding.
- Bacterial pre-treatment methods (detergent, trypsin, boiling) were used to assess binding inhibition.
- Electron microscopy was utilized to examine bacterial pili expression.
Main Results:
- Thirteen out of 21 Haemophilus ducreyi isolates demonstrated binding to all five tested extracellular matrix proteins.
- Bacterial binding to protein-coated beads was reduced by pre-treatment with detergent, trypsin, or boiling.
- Two isolates showed no binding to collagen and gelatin, with one also lacking laminin binding.
- Seven strains that did not bind to laminin lacked pili expression, suggesting a pili-mediated interaction.
Conclusions:
- Haemophilus ducreyi exhibits significant binding affinity for multiple extracellular matrix proteins.
- Bacterial pili are likely involved in the specific interaction of Haemophilus ducreyi with laminin.
- These findings contribute to understanding the adhesion mechanisms and pathogenic potential of Haemophilus ducreyi.