Turkish journal of biology = Turk biyoloji dergisi · 2025
In vitro antibiofilm activity of tyrosol against single and dual-species biofilms of Candida tropicalis and Streptococcus mutans.
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Adampour Zarifeh, Yilmaz Öztürk Betül, Yenice Gürsu Bükay, Dağ İlknur
Аннотация
BACKGROUND/AIM: The cross-kingdom biofilm structure formed by Candida tropicalis and Streptococcus mutans may increase caries formation. The aim of this study was to evaluate the in vitro effect of the exogenous tyrosol on single- and dual-species biofilms as well as planktonic cultures formed by C. tropicalis and S. mutans.
MATERIALS AND METHODS: The antimicrobial efficacy of tyrosol was evaluated through broth microdilution, colony-forming unit (CFU) enumeration, and XTT reduction tests to assess cell viability and metabolic activity. Transmission electron microscopy (TEM) was used to examine ultrastructural changes in planktonic cells. Biofilm dynamics were visualized via scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM). The in vitro cytotoxicity of tyrosol was evaluated using NIH/3T3 fibroblast cells.
RESULTS: XTT results showed that the biofilm-reducing effect of amphotericin B (AMB) on single C. tropicalis biofilm at the minimum inhibitory concentration (MIC) and 2× MIC was significantly higher than that of control (47% and 48%, respectively) (p < 0.05). Tyrosol also had a metabolic activity-reducing effect on single C. tropicalis biofilm, but this effect was not statistically significant (39% at 2× MIC and 42% at MIC). Tyrosol and ampicillin (AMP) had no significant reducing effect on single S. mutans biofilm cells (p > 0.05). However, AMP resistance increased in dual culture. CFU enumeration, TEM, SEM, and CLSM data supported these findings. The effect of tyrosol on NIH/3T3 fibroblast cells was suppressive at low concentrations (1-4 mg/mL) and enhancing at high concentrations (4.5-20 mg/mL).
CONCLUSION: This study investigated the antimicrobial and antibiofilm properties of tyrosol against C. tropicalis and S. mutans, individually and in combination. The results showed that tyrosol inhibited growth and biofilm formation, particularly in dual-species biofilms. Although S. mutans had greater resistance, overall microbial viability was reduced. Despite some observed increase in AMP resistance, tyrosol was selectively cytotoxic, indicating its promise as a natural therapeutic agent pending further research.
MATERIALS AND METHODS: The antimicrobial efficacy of tyrosol was evaluated through broth microdilution, colony-forming unit (CFU) enumeration, and XTT reduction tests to assess cell viability and metabolic activity. Transmission electron microscopy (TEM) was used to examine ultrastructural changes in planktonic cells. Biofilm dynamics were visualized via scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM). The in vitro cytotoxicity of tyrosol was evaluated using NIH/3T3 fibroblast cells.
RESULTS: XTT results showed that the biofilm-reducing effect of amphotericin B (AMB) on single C. tropicalis biofilm at the minimum inhibitory concentration (MIC) and 2× MIC was significantly higher than that of control (47% and 48%, respectively) (p < 0.05). Tyrosol also had a metabolic activity-reducing effect on single C. tropicalis biofilm, but this effect was not statistically significant (39% at 2× MIC and 42% at MIC). Tyrosol and ampicillin (AMP) had no significant reducing effect on single S. mutans biofilm cells (p > 0.05). However, AMP resistance increased in dual culture. CFU enumeration, TEM, SEM, and CLSM data supported these findings. The effect of tyrosol on NIH/3T3 fibroblast cells was suppressive at low concentrations (1-4 mg/mL) and enhancing at high concentrations (4.5-20 mg/mL).
CONCLUSION: This study investigated the antimicrobial and antibiofilm properties of tyrosol against C. tropicalis and S. mutans, individually and in combination. The results showed that tyrosol inhibited growth and biofilm formation, particularly in dual-species biofilms. Although S. mutans had greater resistance, overall microbial viability was reduced. Despite some observed increase in AMP resistance, tyrosol was selectively cytotoxic, indicating its promise as a natural therapeutic agent pending further research.