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• W2892217562 abstract "Background Drugs currently used for the treatment of Chagas’ disease, nifurtimox and benznidazole, have a limited effectiveness and toxic side effects. With the aim of finding new therapeutic approaches, in vitro and in vivo anti-Trypanosoma cruzi activity of vitamin C alone and combined with benznidazole were investigated. Methodology/Principal findings The trypanocidal activity on epimastigote and trypomastigote forms was evaluated by counting parasites in a Neubauer chamber after treatment with the compounds. For the amastigote stage, transgenic parasites expressing β-galactosidase were used and quantified by measuring the β-galactosidase activity. The cytotoxicity of compounds was tested on Vero cells. The redox state of the parasite was evaluated by determining the reduced thiol levels (spectrophotometric assay) and the intracellular oxidative state (by flow cytometry). The in vivo trypanocidal activity was evaluated on a murine model of Chagas’ disease. The trypanocidal activity of vitamin C and benznidazole was similar for the three parasite forms. When combining both drugs, vitamin C did not induce any change in the antiparasitic activity of benznidazole on trypomastigotes; however, on mammal cells, vitamin C diminished the cytotoxicity degree of benznidazole. Two mechanisms of action may be postulated for vitamin C: a lethal pro-oxidant effect on the parasite when used alone, and an antioxidant effect, when combined with benznidazole. A similar behavior was observed on infected mice; i.e., parasite counts in infected mice treated with vitamin C were lower than that of the control group. Animals treated with benznidazole presented lower parasitemia levels, as compared with those treated with vitamin C alone. Again, vitamin C did not cause any effect on the antiparasitic profile of benznidazole. Even though a combined treatment was employed, the antioxidant effect of vitamin C on the host was evidenced; a 100% survival was observed and the weight loss occurring during the acute phase of the infection was reduced. Conclusions/Significance Based on these results, the combination of vitamin C with benznidazole could be considered as an alternative treatment for Chagas’ disease. These preliminary results encourage further research to improve the treatment of Chagas’ disease." @default.
• W2892217562 created "2018-09-27" @default.
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• W2892217562 date "2018-09-21" @default.
• W2892217562 modified "2023-10-12" @default.
• W2892217562 title "Anti-parasitic effect of vitamin C alone and in combination with benznidazole against Trypanosoma cruzi" @default.
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• W2892217562 doi "https://doi.org/10.1371/journal.pntd.0006764" @default.
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