N-Acetyl-l-cysteine effects on multi-species oral biofilm formation and bacterial ecology

K. Rasmussen, J. Nikrad, C. Reilly, Y. Li, R. S. Jones

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Future therapies for the treatment of dental decay have to consider the importance of preserving bacterial ecology while reducing biofilm adherence to teeth. A multi-species plaque-derived (MSPD) biofilm model was used to assess how concentrations of N-acetyl-l-cysteine (NAC) (0, 01, 1, 10%) affected the growth of complex oral biofilms. Biofilms were grown (n = 96) for 24 h on hydroxyapatite discs in BMM media with 05% sucrose. Bacterial viability and biomass formation was examined on each disc using a microtitre plate reader. In addition, fluorescence microscopy and Scanning Electron Microscopy was used to qualitatively examine the effect of NAC on bacterial biofilm aggregation, extracellular components and bacterial morphology. The total biomass was significantly decreased after exposure of both 1% (from 048, with a 95% confidence interval of (044, 057) to 035, with confidence interval (031, 038)) and 10% NAC (014 with confidence interval (011, 017)). 16S rRNA amplicon sequencing analysis indicated that 1% NAC reduced biofilm adherence while preserving biofilm ecology.

Original languageEnglish (US)
Pages (from-to)30-38
Number of pages9
JournalLetters in Applied Microbiology
Volume62
Issue number1
DOIs
StatePublished - Jan 1 2016

Bibliographical note

Funding Information:
Research reported in this publication was supported by the National Center for Advancing Translational Sciences of the National Institutes of Health Award Number UL1TR000114. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. We thank Conrado Aparicio for his help in our SEM assay.

Funding Information:
Research reported in this publication was supported by the National Center for Advancing Translational Sciences of the National Institutes of Health Award Number UL1TR000114. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. We thank Conrado Aparicio for his help in our SEM assay.

Publisher Copyright:
© 2016 The Society for Applied Microbiology.

Keywords

  • Biofilms
  • Caries
  • Colonization
  • Dental
  • Disease
  • Microbiome

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