Analysis of putative inhibitors of anthelmintic resistance mechanisms in cattle gastrointestinal nematodes

被引:25
作者
AlGusbi, Salha [1 ]
Kruecken, Juergen [1 ]
Ramuenke, Sabrina [1 ]
von Samson-Himmelstjerna, Georg [1 ]
Demeler, Janina [1 ]
机构
[1] Free Univ Berlin, Inst Parasitol & Trop Vet Med, D-14136 Berlin, Germany
关键词
In vitro assay; Anthelmintic resistance; Cattle nematodes; Cytochrome P450; P-glycoprotein; beta-Tubulin; Pyrosequencing; MACROCYCLIC LACTONE RESISTANCE; P-GLYCOPROTEIN; HAEMONCHUS-CONTORTUS; IN-VITRO; CAENORHABDITIS-ELEGANS; PIPERONYL BUTOXIDE; BENZIMIDAZOLE RESISTANCE; IVERMECTIN RESISTANCE; ABC TRANSPORTERS; GENE-EXPRESSION;
D O I
10.1016/j.ijpara.2014.04.007
中图分类号
R38 [医学寄生虫学]; Q [生物科学];
学科分类号
07 ; 0710 ; 09 ; 100103 ;
摘要
Effects of the cytochrome P450 inhibitor piperonyl butoxide and the P-glycoprotein inhibitor verapamil on the efficacy of ivermectin and thiabendazole were studied in vitro in susceptible and resistant isolates of the cattle parasitic nematodes Cooperia oncophora and Ostertagia ostertagi. The effects of combined use of drug and piperonyl butoxide/verapamil, respectively, were investigated in the Egg Hatch Assay, the Larval Development Assay and the Larval Migration Inhibition Assay. The effects of piperonyl butoxide and verapamil as inhibitors of thiabendazole and ivermectin responses were particularly marked for larval development, where both inhibitors were able to completely eliminate all differences between susceptible and resistant isolates. Even the lowest concentrations of anthelmintics used in combination with inhibitors caused complete inhibition of development. Differences and/or similarities among responses in different isolates were only obtained in the two other assays: in the Egg Hatch Assay piperonyl butoxide caused a shift in concentration-response curves obtained with thiabendazole to the left for all isolates tested, changing relative differences between isolates. In contrast, an effect of verapamil in the Egg Hatch Assay was only apparent for benzimidazole-resistant isolates. In the Larval Migration Inhibition Assay only ivermectin was tested and piperonyl butoxide shifted the concentration-response curves for all isolates to the left, again eliminating differences in EC50 values between susceptible and resistant isolates. This was not the case using verapamil as an inhibitor, where curves for both susceptible and benzimidazole-resistant isolates shifted to the left in Ostertagia isolates. In Cooperia the picture was more complex with ivermectin-resistant isolates showing a larger shift than the susceptible isolate. Single nucleotide polymorphisms in the beta-tubulin isotype I gene were investigated. Significantly increased frequencies of resistance-associated alleles were observed for the codons 167 and 200 in one benzimidazole-resistant isolate but not in an isolate selected for benzimidazole resistance at an early stage of selection. (C) 2014 Australian Society for Parasitology Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:647 / 658
页数:12
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