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Quorum Sensing pp 253-263 | Cite as

Qualitative and Quantitative Determination of Quorum Sensing Inhibition In Vitro

  • Tim Holm Jakobsen
  • Maria van Gennip
  • Louise Dahl Christensen
  • Thomas Bjarnsholt
  • Michael Givskov
Protocol
Part of the Methods in Molecular Biology book series (MIMB, volume 692)

Abstract

The formation of biofilms in conjunction with quorum sensing (QS)-regulated expression of virulence by opportunistic pathogens contributes significantly to immune evasion and tolerance to a variety of antimicrobial treatments. The present protocol describes methods to determine the in vitro efficacy of potential quorum sensing inhibitors (QSIs). Work on Pseudomonas aeruginosa has shown that chemical blockage of QS is a promising new antimicrobial strategy. Several live bacterial reporter systems been developed to screen extracts and pure compounds for QSI activity. Here we describe the usage of reporter strains consisting of a lasB-gfp or rhlA-gfp fusion in P. aeruginosa for qualitative and quantitative evaluation of the inhibition of the two major QS pathways, monitored as reduced expression of green fluorescence. By the use of an in vitro flow cell system it is possible to study the QSI activity by monitoring its ability to interfere with the protective functions of bacterial biofilm. For evaluation of the global effects of QSI compounds, we present a protocol for the DNA microarray-based transcriptomics. Using these in vitro methods it is possible to evaluate the potential of various QSI compounds.

Key words

Quorum sensing inhibitor Halogenated furanones QSI monitor screen DNA microarray In vitro continuous-culture biofilm flow cell system Confocal Scanning Laser Microscopy 

Notes

Acknowledgments

We acknowledge the contributions made by Drs. Morten Hentzer, Hong Wu, Thomas Bovbjerg Rasmussen, Jens Bo Andersen, and Allan Bech Christensen with regard to the initial developments of the model systems.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Tim Holm Jakobsen
    • 1
  • Maria van Gennip
    • 1
  • Louise Dahl Christensen
    • 1
  • Thomas Bjarnsholt
    • 1
    • 2
  • Michael Givskov
    • 1
  1. 1.Department of International Health, Immunology, and Microbiology, Faculty of Health SciencesUniversity of CopenhagenCopenhagenDenmark
  2. 2.Department of Clinical MicrobiologyRigshospitaletCopenhagenDenmark

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