Targeting Candida albicans Pathogenicity: A Multifactorial Approach Using Lippia graveolens Essential Oil

Area of Science:

• Mycology
• Natural Product Chemistry
• Antimicrobial Research

Background:

• Increasing antifungal resistance in *Candida albicans* necessitates novel therapeutic strategies.
• Opportunistic fungal infections pose significant health challenges, particularly in immunocompromised individuals.
• *Candida albicans* is a primary cause of hospital-acquired infections and exhibits resistance to conventional antifungals.

Purpose of the Study:

• To evaluate the antifungal potential of *Lippia graveolens* (Mexican oregano) essential oil against *Candida albicans*.
• To investigate the effects of Mexican oregano essential oil on critical *C. albicans* virulence factors.
• To determine the chemical composition and antifungal efficacy of *Lippia graveolens* essential oil.

Main Methods:

• Gas chromatography-mass spectrometry (GC-MS) for essential oil composition analysis.
• Disk diffusion, broth microdilution, and time-kill kinetics assays for antifungal activity.
• Assessment of germ tube formation, biofilm development, and membrane integrity disruption.

Main Results:

• The essential oil's primary components were identified as carvacrol and thymol.
• Potent fungicidal activity was observed, with minimum inhibitory concentration (MIC) of 2 mg/mL and minimum fungicidal concentration (MFC) of 3 mg/mL.
• Significant inhibition of germ tube formation and complete suppression of germ tube and biofilm development were noted at concentrations ≥ 2 mg/mL, with dose-dependent membrane disruption.

Conclusions:

• *Lippia graveolens* essential oil possesses significant antifungal and anti-virulence properties against *Candida albicans*.
• The essential oil acts through multifactorial mechanisms, including disruption of fungal membrane integrity.
• Mexican oregano essential oil is a promising natural therapeutic agent and potential adjuvant for managing resistant candidiasis.