Phenotypic characterization of Streptococcus pneumoniae biofilm development
Magee Allegrucci1, F Z Hu, K Shen
1State University of New York at Binghamton, Department of Biological Sciences, 104 Science III, Vestal Parkway East, Binghamton, NY 13902, USA.
Journal of Bacteriology
|March 21, 2006
Summary
Streptococcus pneumoniae forms biofilms in three stages, with mature biofilm architecture varying by serotype. This study details pneumococcal biofilm development and protein expression changes over time.
Area of Science:
- Microbiology
- Bacterial Pathogenesis
- Biofilm Research
Background:
- Chronic otitis media with effusion is often linked to Streptococcus pneumoniae, a pathogen hypothesized to cause this condition via biofilms.
- While Streptococcus pneumoniae is known to form biofilms, its developmental process, architecture, and changes during development remain largely uncharacterized.
Purpose of the Study:
- To characterize the biofilm development process and mature biofilm architecture of 14 different Streptococcus pneumoniae strains.
- To investigate the changes in protein expression during biofilm development in Streptococcus pneumoniae.
Main Methods:
- Utilized a continuous-culture biofilm system to study 14 Streptococcus pneumoniae strains from at least 10 serotypes.
- Employed proteomic analysis to identify protein expression changes throughout biofilm development.
Main Results:
- Identified three distinct stages of biofilm development: initial attachment, cluster formation, and biofilm maturation.
- Observed significant variations in mature biofilm architecture among different serotypes, categorized into three groups based on biomass, thickness, and cluster size.
- Detected a steady increase in viable cell counts and total protein concentration over 9 days, with proteomic analysis revealing differential protein production and increased complexity during development.
- Found increased abundance of proteins related to virulence, adhesion, and resistance in biofilms.
Conclusions:
- Streptococcus pneumoniae biofilm development is a complex, multi-stage process with serotype-dependent architectural variations.
- Proteomic analysis reveals dynamic changes in protein expression, including increased virulence, adhesion, and resistance factors, during pneumococcal biofilm formation.
- The findings provide insights into the intricate nature of Streptococcus pneumoniae biofilms, potentially impacting understanding and treatment of related infections.
