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Enhanced bioavailability and cysticidal effect of three mebendazole-oil preparations in mice infected with secondary cysts of Echinococcus granulosus

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Abstract

The aim of the present study is to explore the possibility to increase the efficacy of mebendazole (MBZ) against secondary cysts of Echinococcus granulosus harbored in mice by augmenting the solubility and bioavailability of the drug. Firstly, the saturated solubility of MBZ in nine kinds of oil was determined by high performance liquid chromatography (HPLC), and MBZ was found exhibiting the highest, secondary, and lowest solubility in oleic acid (OA), glycerol trioleate (GT), and soybean oil (SB), respectively. Secondly, MBZ-OA suspension, MBZ-GT suspension, MBZ-SB suspension, and MBZ suspended in 1 % tragacanth (MBZ-1 % tragacanth) were selected for further studies on pharmacokinetics and experimental therapy in mice. Four groups of mice were treated orally with one of aforementioned four MBZ preparations at a single dose of 25 mg/kg, and concentrations of MBZ in plasma obtained from each mouse at various intervals within 24 h postadministration were determined by HPLC. The major pharmacokinetic parameters calculated by MBZ plasma concentration–time curve demonstrated that the peak concentration of the drug (C max ) values obtained from three MBZ-oil preparation groups was 1.6–2.8 times higher than that of MBZ-1 % tragacanth group. The same was true that the area under the drug concentration–time curve (AUC0−∞) values of 19.8 (2.5)–28.2 (2.5) μg/ml × h revealed in the three MBZ-oil preparation groups was significantly higher than that of 11.6 (2.0) μg/ml × h in MBZ-1 % tragacanth group, and the bioavailability of the three MBZ-oil preparation groups was 71–143 % higher than that of MBZ-1 % tragacanth group. In mice infected with secondary cysts of E. granulosus for 8 months treated orally with MBZ-1 % tragacanth at a daily dose of 25 mg/kg for 14 consecutive days, the mean cyst weight was lower than that of untreated control, but the difference was not statistically significant with cyst weight reduction of 48 %. When the infected mice received three MBZ-oil preparations at the same oral dose schedule as aforementioned, the mean cyst weights were significantly lower than those in MBZ-1 % tragacanth group or control group with cyst weight reductions of 71.2–84.7 %. The results indicate that the solubility of MBZ in oils may increase to various degrees according to the kinds of oil used. Meanwhile, three MBZ-oil (OA, GT, and SB) preparations administered orally to mice not only improve the bioavailability of MBZ relative to that of MBZ suspended in 1 % tragacanth, but their effects against hydatid cysts also significantly enhance.

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Acknowledgments

We are most grateful to Qinghai Institute for Endemic Disease Prevention and Control for their kind provision with protoscolices. We are also grateful to Professor Xiao Shuhua for his advice and help in preparing this manuscript. This investigation was funded by International collaboration on drug and diagnostics innovation of tropical diseases in PR China (International S&T Cooperation 2010DFB73280) and special funds of technology development research for science research institute (2011EG150312).

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  1. National Institute of Parasitic Diseases, Chinese Center for Disease, Control and Prevention, Key Laboratory of Parasite and Vector Biology, MOH, WHO Collaborating Centre for Malaria, Schistosomiasis, and Filariasis, Shanghai, 200025, People’s Republic of China

    Cong-shan Liu, Hao-bing Zhang, Bin Jiang, Jun-min Yao, Yi Tao, Jian Xue & Ai-dan Wen

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  1. Cong-shan Liu
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  2. Hao-bing Zhang
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Correspondence to Hao-bing Zhang.

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Liu, Cs., Zhang, Hb., Jiang, B. et al. Enhanced bioavailability and cysticidal effect of three mebendazole-oil preparations in mice infected with secondary cysts of Echinococcus granulosus . Parasitol Res 111, 1205–1211 (2012). https://doi.org/10.1007/s00436-012-2954-2

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