title: A study of the activity of 2-(alkylamino)-1-phenyl-1-ethanethiosulfuric acids against infection by Schistosoma mansoni in a murine model.
abstract: The schistosomicidal activities of seven 2-(alkylamino)-1-phenyl-1-ethanethiosulfuric acids (1a-g) (R=propyl, isopropyl, butyl, isobutyl, t-butyl, sec-butyl, cyclohexyl, respectively) were determined in female Swiss mice infected with Schistosoma mansoni. The compounds were administered in a single oral dose of 800 mg/kg to groups of 15 mice infected with 50 cercariae each. All the compounds were found to be active, a high animal mortality being observed with 1e. These compounds have a high specificity against female worms (64-100% reduction vs. 33-61% reduction in male worms). The test was repeated, a 400-mg/kg sub-dose of 1f also being tested, and similar results were observed. A 94% reduction in the number of female worms was observed when compound 1c was administered in a single 800-mg/kg dose to animals infected with 80 cercariae. Finally, the test was repeated with single 800 mg/kg oral doses of compounds 1e (highly purified) and 1f and a 400-mg/kg sub-dose of 1c. The toxicity of 1e was confirmed, while the animals that received 1c and 1f presented reductions in the worm loads corresponding to 45.9% (male worms) and 84.8% (female worms) for 1c and 50.4% (male worms) and 94.2% (female worms) for 1f.
authors.affiliation: Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
authors.forename: Liliani Salum Alves
authors.initials: LS
authors.lastname: Moreira
authors.forename: Dorila
authors.initials: D
authors.lastname: Piló-Veloso
authors.forename: Rômulo Teixeira
authors.initials: RT
authors.lastname: de Mello
authors.forename: Paulo Marcos Zech
authors.initials: PM
authors.lastname: Coelho
authors.forename: David Lee
authors.initials: DL
authors.lastname: Nelson
mesh_terms: D000818:Animals; D000871:Anthelmintics / Q000627:therapeutic use*; D004195:Disease Models, Animal; D004353:Drug Evaluation, Preclinical; D005260:Female; D008297:Male; D051379:Mice; D012550:Schistosoma mansoni / Q000187:drug effects; D012555:Schistosomiasis mansoni / Q000188:drug therapy*; D012737:Sex Factors; D013463:Sulfuric Acid Esters / Q000627:therapeutic use*; D016896:Treatment Outcome
chemical_list: D000871:Anthelmintics; D013463:Sulfuric Acid Esters