Journal
FEMS MICROBIOLOGY LETTERS
Volume 290, Issue 2, Pages 135-142Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1574-6968.2008.01415.x
Keywords
Pseudomonas aeruginosa; detached cells; cell-surface properties; biofilm-forming capacity; antibiotic susceptibility
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Funding
- Conseil Regional de Bourgogne
- Fond Social Europeen
- Laboratoires Protec society
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Pseudomonas aeruginosa is a pathogenic bacterium widely investigated for its high incidence in clinical environments and its ability to form strong biofilms. During biofilm development, sessile cells acquire physiological characteristics differentiating them from planktonic cells. But after treatment with disinfectants, or to ensure survival of the species in hostile environments, biofilm cells can detach. This complicates disinfection procedures. This study aimed to physiologically characterize cells detached from a P. aeruginosa biofilm and to compare them with their sessile and planktonic counterparts. We first tested planktonic growth kinetics and capacities to form new biofilms. Then we investigated cell-surface properties. And finally, we tested in vitro susceptibility to antibiotics. The results first indicated that sessile and detached cells have similar planktonic growth kinetics and cell-surface properties, distinguishable from those of planktonic cells. Interestingly, the three populations exhibited different biofilm-forming capacities, suggesting that there is a transitional phenotype between sessile and planktonic states, at least during the first hours following cell detachment. It is important to consider this observation when developing treatments to optimize disinfection processes. Surprisingly, the three populations showed the same antibiotic susceptibility profile.
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