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[Sensitivity of dimorphic Candida albicans cells to polyene antibiotics and their combinations with other
Abstract:
It was shown that polyenic antibiotics and their combinations with some other antifungal and antibacterial agents prevented transformation of the C. albicans yeast phase into the tissue one. Moreover, the fungus tissue form proved to be more sensitive than the yeast form to the drugs and especially to their combinations. The in vitro findings were confirmed by the in vivo studies. Combinations of amphotericin B with methacycline, rifampicin, 5-fluorocytosine or polymyxin B were more efficient than the polyene alone. Summation of the drug antifungal effects provided a 4-fold decrease in the polyene quantity required for administration to experimental animals.
Insights
Polyenic antibiotics prevent Candida albicans transformation. Combinations with other agents enhance antifungal efficacy, reducing required polyene doses by fourfold in animal studies.
Area of Science:
- Mycology
- Pharmacology
- Infectious Diseases
Background:
- Candida albicans can transition between yeast and tissue-invasive forms.
- This transformation is crucial for fungal pathogenesis.
- Effective antifungal strategies are needed to combat Candida infections.
Purpose of the Study:
- To investigate the efficacy of polyenic antibiotics and their combinations against Candida albicans.
- To determine if these combinations prevent the yeast-to-tissue phase transition.
- To compare the sensitivity of different Candida albicans forms to antifungal treatments.
Main Methods:
- In vitro testing of polyenic antibiotics and combinations against Candida albicans.
- Assessment of the drugs' effect on the yeast-to-tissue phase transformation.
- In vivo studies to confirm in vitro findings and evaluate treatment efficacy in animal models.
Main Results:
- Polyenic antibiotics and combinations inhibited the transformation of Candida albicans yeast to tissue form.
- The tissue form of Candida albicans was more susceptible to the drugs, especially in combination.
- Combinations of amphotericin B with methacycline, rifampicin, 5-fluorocytosine, or polymyxin B showed superior efficacy.
- Antifungal drug combinations led to a fourfold reduction in the required polyene dosage in animal models.
Conclusions:
- Combination therapy is a promising strategy for treating Candida albicans infections.
- Combined agents enhance the effectiveness of polyenic antibiotics.
- Reduced drug dosages through combination therapy may mitigate side effects and resistance.