期刊
PATHOGENS AND DISEASE
卷 70, 期 3, 页码 414-422出版社
WILEY-BLACKWELL
DOI: 10.1111/2049-632X.12158
关键词
biofilm; Staphylococcus aureus; agrB; alsS; cidA; eDNA; carbohydrate
Extracellular DNA (eDNA) is an important component of the extracellular polymeric substance matrix and is important in the establishment and persistence of Staphylococcus aureus UAMS-1 biofilms. The aim of the study was to determine the temporal expression of genes involved in early biofilm formation and eDNA production. We used qPCR to investigate expression of agrB, which is associated with secreted virulence factors and biofilm dispersal, cidA, which is associated with biofilm adherence and genomic DNA release, and alsS, which is associated with cell lysis, eDNA release and acid tolerance. The contribution of eDNA to the stability of the biofilm matrix was assessed by digesting with DNase I (Pulmozyme) and quantifying structure by confocal microscopy and comstat image analysis. AgrB expression initially increased at 24h but then dramatically decreased at 72h in an inverse relationship to biomass, supporting its role in regulating biofilm dispersal. cidA and alsS expression steadily increased over 72h, suggesting that eDNA was an important component of early biofilm development. DNase I had no effect on biomass, but did cause the biofilms to become more heterogeneous. Carbohydrates in the matrix appeared to play an important role in structural stability.
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