title: Artemether, artesunate, praziquantel and tribendimidine administered singly at different dosages against Clonorchis sinensis: a comparative in vivo study.
abstract: We comparatively assessed the in vivo efficacy of artemether, artesunate, praziquantel and tribendimidine against different stages of Clonorchis sinensis. Rats were infected with 40-50 C. sinensis metacercariae, and drugs were administered singly by the oral route at different dosages. Rats were dissected 2-4 weeks post-treatment and C. sinensis trematodes were removed from the liver and bile ducts and counted. We used a negative binomial regression model to test the effect of drug and dosage in terms of worm burden reduction. Single 150 mg/kg oral doses of artesunate, artemether, tribendimidine and praziquantel, administered to rats infected with adult C. sinensis, resulted in mean worm burden reductions of 100, 100, 89.5 and 80.7%, respectively (all P<0.001). Halving the dose to 75 mg/kg still resulted in highly significant worm burden reductions for artesunate, artemether and tribendimidine (71.4-100%), but not for praziquantel (20.7%). In the juvenile infection model, a single 150 mg/kg oral dose of tribendimidine and praziquantel resulted in mean worm burden reductions of 99.1 and 90.0%, respectively, whereas considerably lower reductions were observed for artemether (59.2%) and artesunate (57.6%) when used at the same single dose. The in vivo results presented here with the artemisinins and tribendimidine provide further data for clinical investigations to assess the safety and efficacy of these drugs in clonorchiasis patients.
authors.affiliation: National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, Shanghai 200025, People's Republic of China. shxiao1@yahoo.com <shxiao1@yahoo.com>
authors.forename: Shu-Hua
authors.initials: SH
authors.lastname: Xiao
authors.forename: Xue
authors.initials: X
authors.lastname: Jian
authors.forename: Marcel
authors.initials: M
authors.lastname: Tanner
authors.forename: Zhang
authors.initials: Z
authors.lastname: Yong-Nian
authors.forename: Jennifer
authors.initials: J
authors.lastname: Keiser
authors.forename: Jürg
authors.initials: J
authors.lastname: Utzinger
authors.forename: Qiang
authors.initials: Q
authors.lastname: Hui-Qiang
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000871:Anthelmintics / Q000008:administration & dosage / Q000627:therapeutic use*; D001652:Bile Ducts / Q000469:parasitology; D003003:Clonorchiasis / Q000188:drug therapy*; D003004:Clonorchis sinensis / Q000187:drug effects* / Q000302:isolation & purification*; D004305:Dose-Response Relationship, Drug; D008099:Liver / Q000469:parasitology; D008297:Male; D051381:Rats
chemical_list: D000871:Anthelmintics