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Related Experiment Videos

Quorum sensing, gene expression, and Pseudomonas biofilms.

T R De Kievit1, B H Iglewski

  • 1Department of Microbiology and Immunology, University of Rochester School of Medicine and Dentistry, New York 14642, USA.

Methods in Enzymology
|November 5, 1999
PubMed
Summary

New methods detect signaling molecules in biofilms, aiding the study of quorum sensing in bacterial communities. This research helps understand how bacteria communicate to form mature biofilms.

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IL-8 production in human lung fibroblasts and epithelial cells activated by the Pseudomonas autoinducer N-3-oxododecanoyl homoserine lactone is transcriptionally regulated by NF-kappa B and activator protein-2.

Journal of immunology (Baltimore, Md. : 1950)·2001

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Quorum sensing is crucial for Pseudomonas aeruginosa biofilm development.
  • Similar signaling mechanisms are likely employed by other microorganisms for mature biofilm formation.

Purpose of the Study:

  • To present novel methods for detecting autoinducer (AI) activity within biofilms.
  • To facilitate the study of quorum sensing in various microbial communities.

Main Methods:

  • Utilized AI-responsive reporter strains with lacZ fusions for detection.
  • Developed two methods: direct detection in crude biofilms and detection after AI purification.
  • Employed multiple indicator strains sensitive to AIs of varying acyl chain lengths.

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Main Results:

  • Successfully detected AI activity in biofilms using the developed reporter systems.
  • Demonstrated the versatility of AI-deficient mutants for quorum-sensing gene expression studies.
  • Highlighted the advantages of AI mutant complementation for experimental manipulation.

Conclusions:

  • The presented methods enable sensitive detection of AI molecules in biofilms.
  • AI-deficient mutants offer a flexible tool for studying quorum sensing.
  • Reporter systems provide options for monitoring gene expression based on experimental needs.