Characterization of biofilm matrix, degradation by DNase treatment and evidence of capsule downregulation in Streptococcus pneumoniae clinical isolates View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2008-10-08

AUTHORS

Luanne Hall-Stoodley, Laura Nistico, Karthik Sambanthamoorthy, Bethany Dice, Duc Nguyen, William J Mershon, Candice Johnson, Fen Ze Hu, Paul Stoodley, Garth D Ehrlich, J Christopher Post

ABSTRACT

BACKGROUND: Streptococcus pneumoniae is a common respiratory pathogen and a major causative agent of respiratory infections, including otitis media (OM). Pneumococcal biofilms have been demonstrated on biopsies of the middle ear mucosa in children receiving tympanostomy tubes, supporting the hypothesis that chronic OM may involve biofilm development by pathogenic bacteria as part of the infectious process. To better understand pneumococcal biofilm formation six low-passage encapsulated nasopharyngeal isolates of S. pneumoniae were assessed over a six-eight day period in vitro. RESULTS: Multiparametric analysis divided the strains into two groups. Those with a high biofilm forming index (BFI) were structurally complex, exhibited greater lectin colocalization and were more resistant to azithromycin. Those with a low BFI developed less extensive biofilms and were more susceptible to azithromycin. dsDNA was present in the S. pneumoniae biofilm matrix in all strains and treatment with DNase I significantly reduced biofilm biomass. Since capsule expression has been hypothesized to be associated with decreased biofilm development, we also examined expression of cpsA, the first gene in the pneumococcal capsule operon. Interestingly, cpsA was downregulated in biofilms in both high and low BFI strains. CONCLUSION: All pneumococcal strains developed biofilms that exhibited extracellular dsDNA in the biofilm matrix, however strains with a high BFI correlated with greater carbohydrate-associated structural complexity and antibiotic resistance. Furthermore, all strains of S. pneumoniae showed downregulation of the cpsA gene during biofilm growth compared to planktonic culture, regardless of BFI ranking, suggesting downregulation of capsule expression occurs generally during adherent growth. More... »

PAGES

173-173

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/1471-2180-8-173

DOI

http://dx.doi.org/10.1186/1471-2180-8-173

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1030255514

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/18842140


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