Alcohol treatment enhances Staphylococcus aureus biofilm development

Area of Science:

• Microbiology
• Biotechnology
• Infectious Diseases

Background:

• Staphylococcus aureus is known to form pathogenic biofilms.
• Ethanol supplementation during biofilm formation increases biofilm levels and alters gene expression.
• The effect of alcohols on preformed S. aureus biofilms remains uninvestigated.

Purpose of the Study:

• To investigate the impact of alcohol treatment on preformed Staphylococcus aureus biofilms.
• To assess the viability and metabolic activity of bacteria within treated biofilms.
• To analyze the transcriptional changes in biofilm-associated and antibiotic resistance genes following alcohol exposure.

Main Methods:

• Preformed S. aureus biofilms were established on PVC plastic plates.
• Biofilms were subsequently treated with five different alcohols.
• Biofilm levels were quantified after 24 hours of treatment.
• Bacterial viability and metabolic activity were assessed.
• Gene expression analysis was performed for icaA, icaD, and antibiotic resistance genes.

Main Results:

• Alcohol treatment significantly increased preformed S. aureus biofilm levels after 24 hours.
• A substantial number of bacteria within the treated biofilms remained viable and metabolically active.
• Transcription of biofilm-promoting genes (icaA, icaD) and antibiotic resistance genes was upregulated.
• Extended alcohol exposure enhanced biofilm formation.

Conclusions:

• Treatment of preformed S. aureus biofilms with alcohols can lead to enhanced biofilm levels over time.
• Alcohols may not be effective for eradicating established S. aureus biofilms.
• Further research is needed to understand the mechanisms behind alcohol-induced biofilm enhancement and resistance.