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Volume 154, Issue 7

Oral bacteria in biofilms exhibit slow reactivation from nutrient deprivation Free

Abstract

The ability of oral bacteria to enter a non-growing state is believed to be an important mechanism for survival in the starved micro-environments of the oral cavity. In this study, we examined the reactivation of nutrient-deprived cells of two oral bacteria in biofilms, and . Non-growing cells were generated by incubation in 10 mM potassium phosphate buffer for 24 h and the results were compared to those of planktonic cultures. When both types of cells were shifted from a rich, peptone–yeast extract–glucose (PYG) medium to buffer for 24 h, dehydrogenase and esterase activity measured by the fluorescent dyes 5-cyano-2,3-ditolyl-tetrazolium chloride (CTC) and fluorescein diacetate (FDA), respectively, was absent in both species. However, the membranes of the vast majority of nutrient-deprived cells remained intact as assessed by LIVE/DEAD staining. Metabolic reactivation of the nutrient-deprived biofilm cells was not observed for at least 48 h following addition of fresh PYG medium, whereas the non-growing planktonic cultures of the same two strains were in rapid growth in less than 2 h. At 72 h, the biofilm cells had recovered 78 % of the dehydrogenase activity and 61 % of the esterase activity and the biomass mm had increased by 30–35 %. With at 72 h, the biofilms had recovered 56 % and 75 % of dehydrogenase and esterase activity, respectively. Reactivation of both species in biofilms was enhanced by removal of glucose from PYG, and cells were particularly responsive to yeast extract (YE) medium. The data suggest that the low reactivity of non-growing biofilm cells to the introduction of fresh nutrients may be a survival strategy employed by micro-organisms in the oral cavity.

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Keyword(s): CSLM, confocal scanning laser microscopy , CTC, 5-cyano-2,3-ditolyl tetrazolium chloride , EB, ethidium bromide , FDA, fluorescein diacetate , PY; peptone-yeast extract , PYG, peptone-yeast extract-glucose and YE, yeast extract
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2008-07-01
2024-04-19
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Oral bacteria in biofilms exhibit slow reactivation from nutrient deprivation
Microbiology 154, 1927 (2008); https://doi.org/10.1099/mic.0.2008/016576-0
/content/journal/micro/10.1099/mic.0.2008/016576-0
/content/journal/micro/10.1099/mic.0.2008/016576-0
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