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Effect of antibiotics, alone and in combination, on Panton-Valentine leukocidin production by a Staphylococcus aureus

O Dumitrescu1, C Badiou, M Bes

  • 1INSERM U851 and Université Lyon 1, Centre National de Référence des Staphylocoques, Faculté Laennec, Lyon, France.

Clinical Microbiology and Infection : the Official Publication of the European Society of Clinical Microbiology and Infectious Diseases
|February 12, 2008
PubMed

Insights

This study investigated how antibiotics affect Panton-Valentine leukocidin (PVL) release in Staphylococcus aureus. Oxacillin increased PVL, but combinations with clindamycin, rifampicin, or linezolid inhibited it, suggesting better treatment options.

Area of Science:

  • Microbiology
  • Pharmacology
  • Infectious Diseases

Background:

  • Panton-Valentine leukocidin (PVL) is a toxin produced by some Staphylococcus aureus strains.
  • PVL contributes to severe staphylococcal infections, including skin and soft tissue infections and pneumonia.
  • Understanding how antibiotics influence PVL production is crucial for effective treatment strategies.

Purpose of the Study:

  • To evaluate the effect of sub-inhibitory concentrations of various anti-staphylococcal drugs on PVL release from Staphylococcus aureus strain LUG855.
  • To determine the impact of combining oxacillin with other antibiotics on PVL induction.

Main Methods:

  • Staphylococcus aureus strain LUG855 was cultured in the presence of sub-inhibitory concentrations of different antibiotics.
  • Panton-Valentine leukocidin (PVL) release was measured using quantitative assays.
  • The effects of individual drugs and drug combinations on PVL production were analyzed.

Main Results:

  • Oxacillin significantly enhanced PVL release by 2.5-fold.
  • Clindamycin, linezolid, fusidic acid, and rifampicin inhibited PVL release individually.
  • Combining oxacillin with clindamycin or rifampicin significantly inhibited PVL induction, while linezolid showed less inhibition, and fusidic acid had no effect.

Conclusions:

  • Oxacillin alone may exacerbate PVL-mediated infections.
  • Combination therapy of oxacillin with clindamycin, rifampicin, or linezolid is recommended for treating PVL-positive Staphylococcus aureus infections.
  • These findings provide valuable insights for optimizing antibiotic regimens against severe staphylococcal diseases.

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