Related Experiment Videos
Adhesive interactions between medically important yeasts and bacteria
K W Millsap1, H C van der Mei, R Bos
1Laboratory for Materia Technica, University of Groningen, The Netherlands. k.w.millsap@med.rug.nl
Abstract:
Yeasts are being increasingly identified as important organisms in human infections. Adhesive interactions between yeasts and bacteria may contribute to yeast retention at body sites. Methods for studying adhesive interactions between bacterial strains are well known, and range from simple macroscopic methods to flow chamber systems with complex image analysis capabilities. The adhesive interactions between bacteria and yeasts have been studied employing several of the methods originally developed for studying adhesive interactions between bacteria. However, in many of the methods employed the larger size of the yeasts as compared with bacteria results in strong sedimentation of the yeasts, often invalidating the method adapted. In addition, most methods are semi-quantitative and do not properly control mass transport. Consequently, adhesive interaction mechanisms between yeasts and bacteria identified hitherto, including lectin binding and protein-protein interactions, must be regarded with caution. Extensive physico-chemical characteristics of yeast cell surfaces are not available and a physico-chemical mechanism has not yet been put forth. A new method for quantifying adhesive interactions between yeasts and bacteria is proposed, based on the use of a parallel plate flow chamber, in which the influence of adhering bacteria upon the kinetics of yeast adhesion and aggregation of the adhering yeasts is quantitatively evaluated, under carefully controlled mass transport.
Insights
This study introduces a novel method to quantify yeast-bacteria adhesion, crucial for understanding human infections. The new technique overcomes limitations of existing methods, enabling more accurate analysis of these interactions.
Area of Science:
- Microbiology
- Infectious Diseases
- Biophysics
Background:
- Yeasts are increasingly recognized as significant pathogens in human infections.
- Adhesive interactions between yeasts and bacteria are implicated in yeast colonization at body sites.
- Existing methods for studying yeast-bacteria adhesion are often semi-quantitative and invalidated by yeast sedimentation, hindering accurate mechanism identification.
Purpose of the Study:
- To develop and validate a new, quantitative method for assessing adhesive interactions between yeasts and bacteria.
- To address the limitations of current techniques, particularly sedimentation and mass transport control.
- To provide a foundation for elucidating the physico-chemical mechanisms governing yeast-bacteria adhesion.
Main Methods:
- A parallel plate flow chamber system was employed to quantitatively evaluate yeast-bacteria adhesion.
- The method focuses on the influence of adhering bacteria on yeast adhesion kinetics and aggregation.
- Careful control of mass transport was implemented to ensure reliable measurements.
Main Results:
- The proposed method allows for quantitative evaluation of yeast adhesion and aggregation influenced by bacteria.
- It addresses issues of yeast sedimentation and mass transport inherent in previous techniques.
- This facilitates a more accurate understanding of the adhesive interactions between these microorganisms.
Conclusions:
- A novel, quantitative method using a parallel plate flow chamber has been developed for studying yeast-bacteria adhesion.
- This method overcomes critical limitations of prior techniques, enabling more reliable assessment of adhesive interactions.
- The findings pave the way for a deeper understanding of the physico-chemical basis of yeast-bacteria adhesion in infectious contexts.