Abstract
Purpose
Infectious diseases caused by Candida sp. have high drug resistance due to the uncontrolled use of antibiotics. Among the natural products, ursolic acid (UA), a triterpene, has been increasing interest due to its antimicrobial effects. However, the physicochemical properties of UA, such as its low aqueous solubility, lead to failure of therapeutic application. Because of this, drug release systems, such as liquid crystals (LCs), can improve solubilization and increase the therapeutic efficacy of many drugs.
Methods
In this work, we evaluated the antifungal potential of UA and loaded into LC precursor system against Candida sp. The system was composed of oleic acid (30%), polysorbate 80 (60%), and purified water (10%). Polarized light microscopy, rheological assays, and simulated vaginal fluid (SVF) simulations were performed. Cytotoxicity assay was evaluated against L-929 cells (murine fibroblast), and antifungal evaluation was performed by microplate microdilution method against Candida albicans, Candida glabrata, Candida krusei, Candida parapsilosis, and Candida tropicalis.
Results
The system showed acceptable parameters for UA incorporation, such as adhesiveness, texture, and flow behaviors, compatible to vaginal administration. Free UA showed no antifungal activity; however, after incorporation into LCs, it was observed against C. albicans, C. glabrata, C. tropicalis, and C. parapsilosis (MIC values around 500 μg/mL and 3.9 μg/cell viability assays showed moderate cytotoxicity [halo diameter 1.00 ± 0.156]).
Conclusion
In conclusion, the results corroborate in the materials field as a possible alternative in the treatment of infectious diseases by Candida species and the systems showed potential promising for enhancing AU antifungal performance with the application on vulvovaginitis.
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Change history
28 August 2020
A Correction to this paper has been published: https://doi.org/10.1007/s12247-020-09489-3
Abbreviations
- AmB:
-
Amphotericin B
- DMEM:
-
Culture Medium Dulbecco
- F:
-
Formulation containing 60% (w/w) of surfactant, 30% (w/w) of oleic acid, and 10% (w/w) of purified water
- F100:
-
Formulation containing 60% (w/w) of surfactant, 30% (w/w) of oleic acid, and 10% (w/w) of purified water diluted with 100% (v/w) of simulated vaginal fluid
- F30:
-
Formulation containing 60% (w/w) of surfactant, 30% (w/w) of oleic acid, and 10% (w/w) of purified water diluted with 30% (v/w) of simulated vaginal fluid
- F50:
-
Formulation containing 60% (w/w) of surfactant, 30% (w/w) of oleic acid, and 10% (w/w) of purified water diluted with 50% (v/w) of simulated vaginal fluid
- FLC:
-
Fluconazole
- FUA:
-
Formulation containing 60% (w/w) of surfactant, 30% (w/w) of oleic acid, and 10% (w/w) of purified water loaded with ursolic acid (2000 μg/mL)
- FUA100:
-
Formulation containing 60% (w/w) of surfactant, 30% (w/w) of oleic acid, and 10% (w/w) of purified water loaded with ursolic acid (2000 μg/mL) diluted with 100% (v/w) of simulated vaginal fluid
- FUA30:
-
Formulation containing 60% (w/w) of surfactant, 30% (w/w) of oleic acid, and 10% (w/w) of purified water loaded with ursolic acid (2000 μg/mL) diluted with 30% (v/w) of simulated vaginal fluid
- FUA50:
-
Formulation containing 60% (w/w) of surfactant, 30% (w/w) of oleic acid, and 10% (w/w) of purified water loaded with ursolic acid (2000 μg/mL) diluted with 50% (v/w) of simulated vaginal fluid
- GTS:
-
Gelled transparent systems
- LCs:
-
Liquid crystals
- LTS:
-
Liquid transparent systems
- MEs:
-
Microemulsions
- MFC:
-
Minimum fungicidal concentration
- MIC:
-
Minimum inhibitory concentration
- NC:
-
Negative control
- OA:
-
Oleic acid
- PC:
-
Positive control
- PS:
-
Phase separation
- RPMI:
-
Roswell Park Memorial Institute—1640 medium
- SDB:
-
Sabouraud dextrose broth
- SVF:
-
Simulated vaginal fluid
- TTC:
-
Triphenyltetrazolium chloride
- UA:
-
Ursolic acid
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Acknowledgments
We thank the São Paulo Research Foundation—FAPESP (grant #2018/23442-2) for the financial support. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Ensino Superior—Brasil (CAPES)—Finance code 001.
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Marena, G.D., Fonseca-Santos, B., Matheus Aparecido dos Santos, R. et al. Incorporation of Ursolic Acid in Liquid Crystalline Systems Improves the Antifungal Activity Against Candida Sp. J Pharm Innov 16, 576–586 (2021). https://doi.org/10.1007/s12247-020-09470-0
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DOI: https://doi.org/10.1007/s12247-020-09470-0