title: Use of free living stages to study the effects of thiabendazole, levamisole, pyrantel and ivermectin on the fine structure of Haemonchus contortus and Heligmosomoides polygyrus.
abstract: Ultrastructural changes induced in vitro by thiabendazole, levamisole, pyrantel and ivermectin in the free living larval stages of two trichostrongyles (Heligmosomoides polygyrus and Haemonchus contortus) were analysed. The observed damage for each anthelmintic is related to the known mode of action and compared to the damage commonly described in adults. The advantage of using larvae to study the effects of anthelmintics on the fine structure of nematodes rather than adults is described. Thiabendazole induced alteration of the cellular organization especially epithelial cells of the digestive tract. Changes in mitochondria were also seen. Levamisole caused contraction of muscle fibres whereas no specific lesions were observed with pyrantel. Ivermectin caused an hypertrophy of muscular groups. The interest of such a technique in research on the modes of action of anthelmintics is emphasized.
authors.affiliation: Service de Parasitologie, Ecole Nationale Vétérinaire, Marcy l'Etoile, France.
authors.forename: F
authors.initials: F
authors.lastname: Beugnet
authors.forename: D
authors.initials: D
authors.lastname: Kerboeuf
authors.forename: J C
authors.initials: JC
authors.lastname: Nicolle
authors.forename: D
authors.initials: D
authors.lastname: Soubieux
mesh_terms: D000818:Animals; D000969:Antinematodal Agents / Q000633:toxicity*; D006189:Haemonchus / Q000187:drug effects* / Q000648:ultrastructure; D007559:Ivermectin / Q000633:toxicity*; D007814:Larva; D007978:Levamisole / Q000633:toxicity*; D051379:Mice; D008854:Microscopy, Electron; D011715:Pyrantel / Q000633:toxicity*; D012756:Sheep; D013827:Thiabendazole / Q000633:toxicity*; D014251:Trichostrongyloidea / Q000187:drug effects* / Q000648:ultrastructure
chemical_list: D000969:Antinematodal Agents; D007978:Levamisole; D011715:Pyrantel; D007559:Ivermectin; D013827:Thiabendazole