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Macrolides and community-acquired pneumonia: is quorum sensing the key?

Matt P Wise1, David W Williams, Michael A O Lewis

  • 1Adult Critical Care, University Hospital of Wales, Cardiff CF14 4XW, UK. mattwise@doctors.org.uk

Critical Care (London, England)
|July 29, 2010
PubMed

Insights

Combination therapy for severe community-acquired pneumonia is better than monotherapy. Adding a macrolide antibiotic may offer superior outcomes due to additional mechanisms beyond bacterial killing.

Area of Science:

  • Infectious Diseases
  • Pharmacology
  • Microbiology

Background:

  • Severe community-acquired pneumonia (CAP) treatment often involves combination antimicrobial therapy.
  • Emerging evidence suggests macrolide antibiotics, when used as a second agent, may enhance treatment efficacy in CAP.
  • Macrolides possess unique properties beyond direct bacterial killing, including the inhibition of bacterial quorum sensing.

Purpose of the Study:

  • To evaluate the superiority of combination therapy including macrolides for severe community-acquired pneumonia.
  • To explore the potential benefits of macrolides' quorum sensing inhibition as a therapeutic mechanism in severe infections.
  • To identify novel targets for anti-infective drug development based on macrolide's non-bactericidal effects.

Main Methods:

  • The study design necessitates confirmation through a randomized controlled trial.
  • Comparative analysis of different antimicrobial combination regimens in severe CAP.
  • Investigation into the pleiotropic effects of macrolides, including quorum sensing inhibition.

Main Results:

  • Combination therapy is demonstrably superior to monotherapy for severe CAP.
  • Preliminary data indicate a potential advantage of macrolide-containing combinations.
  • Macrolides inhibit bacterial quorum sensing, a mechanism distinct from direct bacterial killing.

Conclusions:

  • Combination antimicrobial therapy is the standard of care for severe CAP.
  • Macrolides may offer additional therapeutic benefits in severe CAP through quorum sensing inhibition.
  • Quorum sensing inhibition represents a promising novel target for future anti-infective drug development.

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