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Amoebicidal Activity of Caffeine and Maslinic Acid by the Induction of Programmed Cell Death in Acanthamoeba
Carmen M Martín-Navarro1, Atteneri López-Arencibia1,2, Ines Sifaoui1,3
1University Institute of Tropical Diseases and Public Health of the Canary Islands, Universidad de La Laguna, Tenerife, Canary Islands, Spain.
Abstract:
Free-living amoebae of the genus Acanthamoeba are the causal agents of a sight-threatening ulceration of the cornea called Acanthamoeba keratitis, as well as the rare but usually fatal disease granulomatous amoebic encephalitis. Although there are many therapeutic options for the treatment of Acanthamoeba infections, they are generally lengthy and/or have limited efficacy. For the best clinical outcome, treatments should target both the trophozoite and the cyst stages, as cysts are known to confer resistance to treatment. In this study, we document the activities of caffeine and maslinic acid against both the trophozoite and the cyst stages of three clinical strains of Acanthamoeba These drugs were chosen because they are reported to inhibit glycogen phosphorylase, which is required for encystation. Maslinic acid is also reported to be an inhibitor of extracellular proteases, which may be relevant since the protease activities of Acanthamoeba species are correlated with their pathogenicity. We also provide evidence for the first time that both drugs exert their anti-amoebal effects through programmed cell death.
Insights
Caffeine and maslinic acid show promise in treating Acanthamoeba infections by targeting both active trophozoites and resistant cysts. These compounds induce programmed cell death in Acanthamoeba, offering a potential new therapeutic strategy.
Area of Science:
- Microbiology
- Parasitology
- Drug Discovery
Background:
- Acanthamoeba species cause serious eye infections (keratitis) and brain infections (encephalitis).
- Current treatments for Acanthamoeba infections are often ineffective against resistant cyst stages.
- Targeting both trophozoite and cyst stages is crucial for effective treatment.
Purpose of the Study:
- To investigate the anti-amoebal activity of caffeine and maslinic acid.
- To evaluate their efficacy against both trophozoite and cyst stages of Acanthamoeba.
- To elucidate the mechanism of action of these compounds.
Main Methods:
- Testing caffeine and maslinic acid against three clinical strains of Acanthamoeba.
- Assessing activity against both trophozoite and cyst forms.
- Investigating the mechanism of cell death induced by the drugs.
Main Results:
- Caffeine and maslinic acid demonstrated activity against both Acanthamoeba trophozoites and cysts.
- Evidence suggests both drugs induce programmed cell death in Acanthamoeba.
- Maslinic acid's protease inhibition may reduce Acanthamoeba pathogenicity.
Conclusions:
- Caffeine and maslinic acid are potential therapeutic agents against Acanthamoeba.
- These compounds offer a novel approach by targeting both life stages and inducing cell death.
- Further research is warranted to develop these compounds into clinical treatments.
