Effect of multidrug resistance modulators on the activity of ivermectin and moxidectin against selected strains of Haemonchus contortus infective larvae
Nematode parasites have shown resistance to the anthelmintics, ivermectin and moxidectin, and there is evidence that the over-expression of parasite P-glycoprotein (P-gp) may account, at least in part, for resistance to ivermectin. The objective of this study was to evaluate whether the multidrug re...
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Published in: | Pesquisa veterinária brasileira Vol. 21; no. 3; pp. 117 - 121 |
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Colégio Brasileiro de Patologia Animal - CBPA
2001
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Abstract | Nematode parasites have shown resistance to the anthelmintics, ivermectin and moxidectin, and there is evidence that the over-expression of parasite P-glycoprotein (P-gp) may account, at least in part, for resistance to ivermectin. The objective of this study was to evaluate whether the multidrug resistance (MDR) modulators, verapamil, CL 347.099 (an analog of verapamil) and cyclosporin A, would enhance the efficacy of ivermectin and moxidectin against selected strains of Haemonchus contortus using an in vitro larval migration assay. The modulators had no effects on the number of migrating larvae when used alone. Ivermectin and moxidectin showed a significant (P<0.05) increase in its efficacy by 52.8 and 58.5% respectively, when used in association with verapamil against a moxidectin-selected strain. CL 347,099 also increased significantly (P<0.05) the ivermectin and moxidectin efficacy by 24.2 and 40.0% respectively, against an ivermectin-selected strain and by 40.0 and 75.6% respectively, against an moxidectin-selected strain. At the concentrations tested cyclosporin A showed a variable effect on increasing the efficacy of the anthelmintics against the susceptible and resistant strains.
Existem relatos demonstrando a resistência de nematóides aos anti-helmínticos, ivermectina e moxidectina. O aumento da expressão da glicoproteína-P (P-gp) no parasita pode contribuir para o desenvolvimento da resistência a ivermectina. O objetivo deste trabalho foi avaliar se o uso combinado dos moduladores de resistência múltipla, verapamil, CL 347.099 (um análogo do verapamil) e ciclosporina A associados a ivermectina ou moxidectina, aumenta a eficácia dos anti-helmínticos contra cepas selecionadas de Haemonchus contortus, utilizando um experimento in vitro de migração de larvas. Ivermectina e moxidectina apresentaram um aumento significativo (P<0,05) de sua eficácia em 52,8 e 58,5%, respectivamente, quando utilizadas em associação com o verapamil contra a cepa selecionada para moxidectina. CL 347.099 também aumentou significativamente (P<0,05) a eficácia de ivermectina e de moxidectina em 24,2 e 40,0%, respectivamente, contra a cepa selecionada para a ivermectina e em 40,0 e 75,6% respectivamente, contra a cepa selecionada para moxidectina. Nas concentrações testadas, ciclosporina A apresentou resultados variáveis quando combinada com os anti-helmínticos. Quando utilizados sozinhos, os moduladores não apresentarão efeito na redução do número de larvas. |
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AbstractList | Nematode parasites have shown resistance to the anthelmintics, ivermectin and moxidectin, and there is evidence that the over-expression of parasite P-glycoprotein (P-gp) may account, at least in part, for resistance to ivermectin. The objective of this study was to evaluate whether the multidrug resistance (MDR) modulators, verapamil, CL 347.099 (an analog of verapamil) and cyclosporin A, would enhance the efficacy of ivermectin and moxidectin against selected strains of Haemonchus contortus using an in vitro larval migration assay. The modulators had no effects on the number of migrating larvae when used alone. Ivermectin and moxidectin showed a significant (P<0.05) increase in its efficacy by 52.8 and 58.5% respectively, when used in association with verapamil against a moxidectin-selected strain. CL 347,099 also increased significantly (P<0.05) the ivermectin and moxidectin efficacy by 24.2 and 40.0% respectively, against an ivermectin-selected strain and by 40.0 and 75.6% respectively, against an moxidectin-selected strain. At the concentrations tested cyclosporin A showed a variable effect on increasing the efficacy of the anthelmintics against the susceptible and resistant strains. Nematode parasites have shown resistance to the anthelmintics, ivermectin and moxidectin, and there is evidence that the over-expression of parasite P-glycoprotein (P-gp) may account, at least in part, for resistance to ivermectin. The objective of this study was to evaluate whether the multidrug resistance (MDR) modulators, verapamil, CL 347.099 (an analog of verapamil) and cyclosporin A, would enhance the efficacy of ivermectin and moxidectin against selected strains of Haemonchus contortus using an in vitro larval migration assay. The modulators had no effects on the number of migrating larvae when used alone. Ivermectin and moxidectin showed a significant (P<0.05) increase in its efficacy by 52.8 and 58.5% respectively, when used in association with verapamil against a moxidectin-selected strain. CL 347,099 also increased significantly (P<0.05) the ivermectin and moxidectin efficacy by 24.2 and 40.0% respectively, against an ivermectin-selected strain and by 40.0 and 75.6% respectively, against an moxidectin-selected strain. At the concentrations tested cyclosporin A showed a variable effect on increasing the efficacy of the anthelmintics against the susceptible and resistant strains. Existem relatos demonstrando a resistência de nematóides aos anti-helmínticos, ivermectina e moxidectina. O aumento da expressão da glicoproteína-P (P-gp) no parasita pode contribuir para o desenvolvimento da resistência a ivermectina. O objetivo deste trabalho foi avaliar se o uso combinado dos moduladores de resistência múltipla, verapamil, CL 347.099 (um análogo do verapamil) e ciclosporina A associados a ivermectina ou moxidectina, aumenta a eficácia dos anti-helmínticos contra cepas selecionadas de Haemonchus contortus, utilizando um experimento in vitro de migração de larvas. Ivermectina e moxidectina apresentaram um aumento significativo (P<0,05) de sua eficácia em 52,8 e 58,5%, respectivamente, quando utilizadas em associação com o verapamil contra a cepa selecionada para moxidectina. CL 347.099 também aumentou significativamente (P<0,05) a eficácia de ivermectina e de moxidectina em 24,2 e 40,0%, respectivamente, contra a cepa selecionada para a ivermectina e em 40,0 e 75,6% respectivamente, contra a cepa selecionada para moxidectina. Nas concentrações testadas, ciclosporina A apresentou resultados variáveis quando combinada com os anti-helmínticos. Quando utilizados sozinhos, os moduladores não apresentarão efeito na redução do número de larvas. |
Author | Prichard, Roger K.(McGill University Institute of Parasitology) Molento, Marcelo B.(Universidade Paranaense Setor de Parasitologia Veterinária) |
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Cites_doi | 10.1016/S0166-6851(98)00087-5 10.1097/00001813-199609000-00005 10.1016/0098-2997(94)00040-A 10.1016/0020-7519(94)00115-5 10.1038/bjc.1994.286 10.1006/expr.1998.4373 10.1016/0304-4017(95)00807-1 10.1016/S0006-2952(96)00656-9 10.1159/000139213 10.1016/S0074-7696(08)62587-5 10.1136/vr.136.17.443 10.1016/S0304-4017(97)00065-4 10.1007/s004360050673 10.3109/02841869509093961 10.1002/j.1460-2075.1995.tb07178.x 10.1002/1097-0142(19931201)72:11+<3502::AID-CNCR2820721618>3.0.CO;2-N |
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Res. doi: 10.1007/s004360050673 contributor: fullname: Molento M.B. – volume: 34 start-page: 235 issn: 0284-186X year: 1995 ident: ref20 article-title: Comparative study on reversal efficacy of SDZ PSC 833, cyclosporin A and verapamil on multidrug resistance in vitro and in vivo publication-title: Acta Oncol. doi: 10.3109/02841869509093961 contributor: fullname: Watanabe T. – volume: 14 start-page: 1858 year: 1995 ident: ref3 article-title: A P-glycoprotein protects Caenorhabditis elegans against natural toxins publication-title: EMBO doi: 10.1002/j.1460-2075.1995.tb07178.x contributor: fullname: Broeks A. – volume: 72 start-page: 3502 issn: 0008-543X year: 1993 ident: ref11 article-title: Clinical trials of modulation of multidrug resistance publication-title: Cancer doi: 10.1002/1097-0142(19931201)72:11+<3502::AID-CNCR2820721618>3.0.CO;2-N contributor: fullname: Lum B.L. |
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SubjectTerms | ciclosporina A CL 347.099 cyclosporin A ivermectin ivermectina moduladores modulators moxidectin moxidectina multidrug resistance (MDR) Nematode Nematóides resistência múltipla (MDR) verapamil |
Title | Effect of multidrug resistance modulators on the activity of ivermectin and moxidectin against selected strains of Haemonchus contortus infective larvae |
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