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[The adhesive activity of Klebsiella pneumoniae controlled by plasmid 55 MD]
Abstract:
In K. pneumoniae clinical strains a nonconjugative plasmid, denoted as pAdh-55 and responsible for their adhesive activity with respect to HEp-2 cells, was detected. The comparison of genetically related pairs of K. pneumoniae strains differing in the presence of pAdh-55 revealed that the loss of this plasmid by bacteria was accompanied by a decrease, and its acquisition by a considerable increase, in the number of Klebsiella-affected cells in the monolayer. The correlation between the presence of pAdh-55 in K. pneumoniae strains and their adhesive activity was established both in experiments aimed at the morphological study of preparations stained with azure eosin and in experiments with isotope-labeled bacteria.
Insights
A plasmid, pAdh-55, significantly increases Klebsiella pneumoniae
Area of Science:
- Microbiology
- Molecular Biology
- Cell Biology
Background:
- Klebsiella pneumoniae is an opportunistic pathogen.
- Bacterial adhesion is crucial for host cell colonization.
- Plasmids can confer virulence factors to bacteria.
Purpose of the Study:
- To investigate the role of plasmid pAdh-55 in Klebsiella pneumoniae adhesion to HEp-2 cells.
- To establish the correlation between pAdh-55 presence and bacterial adhesive activity.
Main Methods:
- Comparative analysis of isogenic Klebsiella pneumoniae strains with and without pAdh-55.
- Morphological studies using azure eosin staining.
- Experiments utilizing isotope-labeled bacteria to quantify adhesion.
Main Results:
- The presence of pAdh-55 in Klebsiella pneumoniae strains directly correlates with enhanced adhesive activity.
- Loss of pAdh-55 resulted in decreased bacterial adhesion to HEp-2 cells.
- Acquisition of pAdh-55 led to a significant increase in Klebsiella-affected cells.
Conclusions:
- Plasmid pAdh-55 is a key determinant of Klebsiella pneumoniae's adhesive properties.
- pAdh-55 plays a significant role in the pathogenesis of Klebsiella pneumoniae infections.
- Targeting pAdh-55 could be a potential strategy for controlling Klebsiella pneumoniae infections.