RESUMO
Effect of candidate compounds 81-470 i.e. methyl [5[4-(2-pyridinyl)-1-piperazinyl]carbonyl]-1H-benzimidazole-2-yl]- carbamate and 86-162 i.e. methyl-5(6)-(alpha-hydroxyphenyl methyl) benzimidazole-2-carbamate along with reference drugs mebendazole and praziquantel on energy metabolism of C. fasciolaris recovered from rats treated with single dose of 500 mg/kg, ip was investigated. All the drugs significantly lowered the rate of uptake of glucose and alanine by the parasite. Suppression in the formation of lactate, the major end-product, was also noticed. Nonetheless the ratio of lactate produced versus the substrates consumed was not substantially affected. The recovered cysticerci also possessed less glycogen and ATP compared to the normal parasites. Although the effects exerted by the drugs were of the identical nature, they significantly differed in the magnitude of their action. Mebendazole followed by praziquantel maximally affected all the above metabolic activities while 86-162 proved to be the weakest in action. The results suggest that the examined drugs exert their chemotherapeutic activity by interfering with uptake of glucose and alanine but do not significantly alter their catabolism.