Abstract
A possible synergistic effect of macrocyclic lactones’ (MLs) combination has been previously described against resistant gastrointestinal nematodes of cattle. In addition to synergism, drug-drug interactions between MLs can also result in additive or antagonistic effect, considering the different MLs pharmacokinetics, pharmacodynamics, and interactions with molecular mechanisms of resistance. Therefore, the aim of the current work was evaluated the effect of different MLs combinations against Haemonchus contortus. Infecting larvae of two isolates (one susceptible and one resistant to ivermectin) were used in the larval migration inhibition test. After estimating the half maximal effective concentration of abamectin (ABA), eprinomectin, (EPR), ivermectin (IVM), and moxidectin (MOX) for both isolates, combinations were delineated by a simplex-centroid mixture experiment, and the mixture regression analysis was applied to the special cubic model. A synergistic effect was found for the EPR + MOX against the susceptible isolate as well as the EPR + MOX, IVM + MOX, and ABA + EPR + IVM against the resistant isolate. An antagonistic effect of ABA + IVM + MOX was found against the susceptible isolate. For the susceptible isolate, a higher inhibition was found with greater proportions of EPR and lower proportions of the other drugs compared to the reference mixture. For the resistant isolate, inhibition greater than that of the reference mixture was found with higher proportions of IVM as well as lower proportions of the other drugs. The synergistic and antagonistic effects were dependent on the following: (a) parasite drug resistance profile, (b) the composition of the combination, and (c) the proportions used, with EPR and IVM exerting a greater impact on these effects.
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The authors thank Professor Doctor Alessandro Francisco Talamini do Amarante for generously furnishing the isolate of H. contortus susceptible to ivermectin.
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All authors contributed to the study conception and design. Material preparation and data collection were carried out by Matheus Takemi Muchon Nakatani, Dyego Gonçalves Lino Borges, Mário Henrique Conde, Mariana Green de Freitas, Juliane Francielle Tutija, Vinícius Duarte Rodrigues, and Guilherme Henrique Reckziegel. Data analysis were performed by Matheus Takemi Muchon Nakatani, Carlos Alexandre Carollo, and Fernando de Almeida Borges. The first draft of the manuscript was written by Matheus Takemi Muchon Nakatani, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Figure 1S
Response optimization plots of combinations with synergistic effect according to optimal proportions of abamectin (ABA), eprinomectin (EPR), ivermectin (IVM) and moxidectin (MOX) in mixtures against susceptible (RsHco1) and resistant (FAMEZHco1) isolates. Current proportion in mixture (dashed line and values in red), estimated relative inhibition of larval migration (dashed line and valued [%] in blue -y), inhibition curve according to proportion (solid black line), lower limit (grey area, 50% for susceptible isolate and 60% for resistant isolate). (PNG 469 kb)
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Nakatani, M.T.M., Borges, D.G.L., Conde, M.H. et al. Synergism of macrocyclic lactones against Haemonchus contortus. Parasitol Res 122, 867–876 (2023). https://doi.org/10.1007/s00436-023-07790-x
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DOI: https://doi.org/10.1007/s00436-023-07790-x