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Broth Microdilution In Vitro Screening: An Easy and Fast Method to Detect New Antifungal Compounds
Published on: February 14, 2018
Recent advances in antifungal chemotherapy
George Petrikkos1, Anna Skiada
1National and Kapodistrian University of Athens, Medical School, 1st Department of Propedeutic Medicine, Research Laboratory for Infectious Diseases and Antimicrobial Chemotherapy G.K. Daikos, Greece. petrikos@med.uoa.gr
Abstract:
For over 50 years, amphotericin B deoxycholate (AmBD) has been the 'gold standard' in antifungal chemotherapy, despite its frequent toxicities. However, improved treatment options for invasive fungal infections (IFIs) have been developed during the last 15 years. Newer antifungal agents, including less toxic lipid preparations of AmBD, triazoles and the echinocandins, have been added to our armamentarium against IFIs. Some of these newer drugs can now replace AmBD as primary therapy (e.g. caspofungin for candidiasis, voriconazole for aspergillosis), whilst others offer new therapeutic options for difficult-to-treat IFIs (e.g. posaconazole for zygomycosis, fusariosis and chromoblastomycosis). It is interesting that extended use of newer antifungals such as fluconazole, despite decreasing the mortality attributed to candidiasis, resulted in selection of species resistant to several antifungals (Candida krusei, Candida glabrata); whilst several publications suggest that prolonged use of voriconazole may expose severely immunocompromised patients to the risk of zygomycosis (breakthrough). On the other hand, the differences in the mode of action of newer antifungals such as echinocandins raise the question whether combination antifungal therapy is more effective than monotherapy. Finally, the availability of an oral formulation with excellent biosafety of several newer antifungals (e.g. posaconazole) makes them candidates for prophylactic or prolonged maintenance therapy.
Insights
Newer antifungal drugs offer improved options for invasive fungal infections (IFIs), with some replacing older treatments. However, resistance and breakthrough infections are concerns, prompting research into combination therapy and prophylactic use.
Area of Science:
- Mycology
- Infectious Diseases
- Pharmacology
Background:
- Amphotericin B deoxycholate (AmBD) has been a long-standing treatment for invasive fungal infections (IFIs) but causes significant toxicity.
- Recent advancements have introduced newer antifungal agents with improved safety profiles and efficacy.
Purpose of the Study:
- To review the evolution of antifungal chemotherapy for IFIs.
- To compare the efficacy and safety of newer agents against traditional therapies.
- To discuss emerging challenges such as antifungal resistance and breakthrough infections.
Main Methods:
- Literature review of antifungal agents for IFIs.
- Analysis of clinical outcomes and resistance patterns.
- Discussion of treatment guidelines and future therapeutic strategies.
Main Results:
- Lipid formulations of AmBD, triazoles, and echinocandins offer alternatives to conventional AmBD.
- Specific agents like caspofungin and voriconazole are now first-line treatments for certain IFIs.
- Emerging resistance (e.g., Candida krusei, Candida glabrata) and breakthrough infections (e.g., zygomycosis) are noted with prolonged use of some newer agents.
- Oral formulations with good biosafety profile (e.g., posaconazole) show promise for prophylaxis and maintenance therapy.
Conclusions:
- Newer antifungals provide valuable alternatives to AmBD, with some becoming primary therapies.
- Antifungal resistance and breakthrough infections necessitate careful monitoring and strategic treatment planning.
- Combination therapy and prophylactic use of newer agents warrant further investigation for managing complex IFIs.
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