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Metabolic pathways of anthelmintic drug monepantel in sheep and in its parasite (Haemonchus contortus)
Authors: Stuchlíková Lucie | Jirásko Robert | Vokřál Ivan | Valát Martin | Lamka Jiří | Szotáková Barbora | Holčapek Michal | Skálová Lenka
Year: 2014
Type of publication: článek v odborném periodiku
Name of source: Drug Testing and Analysis
Publisher name: Wiley-Blackwell
Page from-to: 1055–1062
Titles:
Language Name Abstract Keywords
cze Metabolismus anthelmintického léčiva monepantelu v ovci a jejím parazitu (Haemonchus contortus) Monepantel je nové anhelmintikum používané ve veterinární léčbě ovcí. Cíl studie byl naleznout metabolické cesty monepantelu v ovcích in vivo a zároveň i u příslušných parazitů ex vivo. porovnána byla MOP biotransformace u dvou různých kmenů H.contortus s rozdílnou citlivostí na léčivo. Identifikace byla provedena s využitím UHPLC/MS/MS a byla provedena v ovčí moči, trusu a nematodách. Celkem bylo identifikováno 13 MOP metabolitů. UHPLC-MS; hmotnostní spektrometrie; nematody; biotransformace
eng Metabolic pathways of anthelmintic drug monepantel in sheep and in its parasite (Haemonchus contortus) Monepantel (MOP) is a new anthelmintic drug intended for the treatment and control of gastrointestinal roundworms (nematodes) infection and associated disease in sheep. The aim of our study was to find out metabolic pathways of MOP in sheep in vivo and in its parasite Haemonchus contortus ex vivo. MOP biotransformation in two H. contortus strains with different sensitivity to anthelmintics was also compared. Ultra high-performance liquid chromatography with tandem mass spectrometry (UHPLC-MS/MS) technique is used for the identification of MOP metabolites in ovine urine, faeces, and nematodes. MOP biotransformation study in sheep in vivo led to the identification of 13 MOP metabolites; 7 of them have not been described previously in in vitro study. The study of MOP biotransformation in H. contorus ex vivo reveals four MOP metabolites. The nitrile hydrolysis as a new biotransformation pathway in helminths ex vivo is reported here for the first time. Unlike sheep, H. contorus nematodes are not able to metabolize MOP via phase II biotransformation. Nematodes of resistant White river (WR) strain form more types of MOP metabolites than nematodes of sensitive inbred susceptible Edinburgh (ISE) strain. Based on obtained results, schemes of metabolic pathways of MOP in sheep and nematodes are proposed. UHPLC-MS; amino-acetonitrile derivatives; mass spectrometry; nematodes; biotransformation

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