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Guedes-da-Silva, F H; Batista, D G J; Da Silva, C F; De Araújo, J S; Pavão, B P; Simões-Silva, M R; Batista, M M; Demarque, K C; Moreira, O C; Britto, C; Lepesheva, G I; Soeiro, M N C
Antimicrobial agents and chemotherapy, 04/2017, Letnik: 61, Številka: 4Journal Article
Chagas disease is a life-threatening infection caused by a variety of genetically diverse strains of the protozoan parasite The current treatment (benznidazole and nifurtimox) is unsatisfactory, and potential alternatives include inhibitors of sterol 14α-demethylase (CYP51), the cytochrome P450 enzyme essential for the biosynthesis of sterols in eukaryotes and the major target of clinical and agricultural antifungals. Here we performed a comparative investigation of two protozoon-specific CYP51 inhibitors, VNI and its CYP51 structure-based derivative VFV, in the murine models of infection caused by the Y strain of The effects of different treatment regimens and drug delivery vehicles were evaluated in animals of both genders, with benznidazole serving as the reference drug. Regardless of the treatment scheme or delivery vehicle, VFV was more potent in both genders, causing a >99.7% peak parasitemia reduction, while the VNI values varied from 91 to 100%. Treatments with VNI and VFV resulted in 100% animal survival and 0% natural relapse after the end of therapy, though, except for the 120-day treatment schemes with VFV, relapses after three cycles of immunosuppression were observed in each animal group, and quantitative PCR analysis revealed a very light parasite load in the blood samples (sometimes below or near the detection limit, which was 1.5 parasite equivalents/ml). Our studies support further investigations of this class of compounds, including their testing against other strains and in combination with other drugs.
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