Pyrogallol exhibits antimicrobial adjuvant properties against Staphylococcus aureus and Staphylococcus epidermidis

Area of Science:

• Microbiology
• Pharmacology
• Medicinal Chemistry

Background:

• Staphylococci are significant human pathogens.
• Antibiotic resistance in staphylococci necessitates novel therapeutic strategies.
• Antimicrobial adjuvants can restore or enhance the efficacy of existing antibiotics.

Purpose of the Study:

• To evaluate pyrogallol as an antimicrobial adjuvant against staphylococci.
• To investigate the mechanism by which pyrogallol affects antibiotic activity.

Main Methods:

• Minimum inhibitory concentration (MIC) assays were performed.
• The effect of pyrogallol on antibiotic susceptibility of Staphylococcus aureus and S. epidermidis was tested.
• Antibiotic accumulation assays were conducted.

Main Results:

• Pyrogallol significantly enhanced linezolid efficacy against all tested staphylococcal strains.
• Pyrogallol increased the activity of cefoxitin and oxacillin against specific strains.
• Catalase-deficient S. aureus showed increased sensitivity to linezolid in the presence of pyrogallol.
• Pyrogallol treatment led to greater intracellular linezolid accumulation in S. aureus.

Conclusions:

• Pyrogallol acts as a potentiator of linezolid-mediated staphylococcal killing.
• The mechanism involves oxidative stress and increased intracellular antibiotic concentration.
• Pyrogallol shows potential as an anti-staphylococcal antimicrobial adjuvant.