title: Toxoplasma gondii: in vitro and in vivo activities of the hydroxynaphthoquinone 2-hydroxy-3-(1'-propen-3-phenyl)-1,4-naphthoquinone alone or combined with sulfadiazine.
abstract: The compound 2-hydroxy-3-(1'-propen-3-phenyl)-1,4-naphthoquinone (PHNQ6) was evaluated for activity against Toxoplasma gondii, alone or combined with sulfadiazine. Treatment with PHNQ6 combined with sulfadiazine protected at least 70 and 90% of mice infected with RH and EGS strains, respectively. Mice were treated with PHNQ6 (50 mg/kg/day) alone or combined with sulfadiazine (40 mg/L) 30 days after infection with P strain. The number of brain cysts was lower in mice treated with PHNQ6 alone or combined with sulfadiazine compared to that in control mice. Degenerated bradyzoites were observed in animals treated with PHNQ6. Infectivity of bradyzoites treated with PHNQ6 alone or combined with sulfadiazine was inhibited after in vitro incubation.
authors.affiliation: Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil. ronize.ferreira@fead.br
authors.forename: Ronize A
authors.initials: RA
authors.lastname: Ferreira
authors.forename: Alaide B
authors.initials: AB
authors.lastname: Oliveira
authors.forename: Múcio F B
authors.initials: MF
authors.lastname: Ribeiro
authors.forename: Wagner L
authors.initials: WL
authors.lastname: Tafuri
authors.forename: Ricardo W A
authors.initials: RW
authors.lastname: Vitor
mesh_terms: D000818:Animals; D000981:Antiprotozoal Agents / Q000494:pharmacology* / Q000627:therapeutic use; D004359:Drug Therapy, Combination; D005260:Female; D051379:Mice; D009285:Naphthoquinones / Q000494:pharmacology* / Q000627:therapeutic use; D011897:Random Allocation; D013411:Sulfadiazine / Q000494:pharmacology* / Q000627:therapeutic use; D014122:Toxoplasma / Q000187:drug effects*; D014124:Toxoplasmosis, Animal / Q000188:drug therapy*; D016896:Treatment Outcome
chemical_list: D000981:Antiprotozoal Agents; D009285:Naphthoquinones; C511102:hydroxynaphthoquinone 2-hydroxy-3-(1'-propen-3-phenyl)-1,4-naphthoquinone; D013411:Sulfadiazine