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Quantifying the Cytotoxicity of Staphylococcus aureus Against Human Polymorphonuclear Leukocytes
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Effect of antibiotics on Staphylococcus aureus producing Panton-Valentine leukocidin

Oana Dumitrescu1, Sandrine Boisset, Cedric Badiou

  • 1INSERM, U851, Lyon, France.

Antimicrobial Agents and Chemotherapy
|January 24, 2007
PubMed

Insights

Antibiotic concentrations impact Staphylococcus aureus Panton-Valentine leukocidin (PVL) production. Subinhibitory oxacillin boosted PVL, while other antibiotics inhibited or had no effect, influencing toxin release in S. aureus.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Pharmacology

Background:

  • Staphylococcus aureus is an opportunistic pathogen.
  • Panton-Valentine leukocidin (PVL) is a key virulence factor produced by some S. aureus strains.
  • PVL contributes to severe tissue damage and invasive infections.

Purpose of the Study:

  • To investigate the effect of various antibiotics on Panton-Valentine leukocidin (PVL) production by Staphylococcus aureus.
  • To determine if antibiotic treatment influences the expression of this important bacterial toxin.

Main Methods:

  • Staphylococcus aureus strains were incubated with different antibiotics.
  • Antibiotic concentrations included inhibitory and subinhibitory levels.
  • Panton-Valentine leukocidin (PVL) levels were measured in the presence of antibiotics.

Main Results:

  • No PVL was detected when S. aureus was incubated at inhibitory antibiotic concentrations.
  • Subinhibitory concentrations of oxacillin significantly enhanced PVL production.
  • Clindamycin, linezolid, and fusidic acid inhibited PVL production.
  • Vancomycin showed minimal effect on PVL levels.

Conclusions:

  • Antibiotic choice and concentration critically influence PVL production in S. aureus.
  • Subinhibitory oxacillin may increase PVL-associated pathogenicity.
  • Certain antibiotics effectively suppress PVL, potentially reducing virulence in S. aureus infections.

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