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In Vitro Effects of Amino Alcohols on Echinococcus granulosus.
Acta Tropica 2018 June
Cystic echinococcosis is a globally distributed zoonotic disease, which is caused by the larval stage of Echinococcosus granulosus sensu lato. The chemotherapy of the disease is limited to the use of benzimidazoles. Recently, mefloquine and its analogues, aminoalcohol-carbazole, and some amino alcohol derivatives were reported to display inhibitory effects on parasites. Here, the activities of 130 amino alcohol compounds against E. granulosus were tested on protoscoleces and germinal cells at a concentration of 20 μg/ml over a period of three days. As a result, sixteen compounds totally were effective against both protoscoleces and germinal cells, and their IC50 and LC50 were also calculated respectively. Then effects of the most active compounds were observed on metacestodes over 14 days in vitro. Although the structure of active compounds were variable, hydroxyl and amino groups connected by two carbon atoms are held in common as the key feature of these compounds. The further investigation on metacestodes incubated with these active compounds revealed that the effects of JF16 and BTB4 were comparable to that of mefloquine and mebendazole. In addition, the ultrastructure alternations induced by these compounds on E. granulosus were confirmed by scanning electron microscopy and transmission electron microscopy observations. In conclusion, amino alcohols were a class of compounds with efficacy against E. granulosus. The most effective compounds JF16 and BTB4 indicated that their basic structure would be useful in the synthesis of new compound for the treatment of echinococcosis. However, their in vivo efficacy and toxicity need to be carefully evaluated in the future.
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