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Background  Our previous studies suggest silkworms can be used as model animals instead of mammals in pharmacologic studies to develop novel therapeutic medicines. We examined the usefulness of the silkworm larvae  Bombyx mori  as an animal model for evaluating tissue injury induced by various cytotoxic drugs. Drugs that induce hepatotoxic effects in mammals were injected into the silkworm hemocoel, and alanine aminotransferase (ALT) activity was measured in the hemolymph 1 day later.    Results  Injection of CCl 4  into the hemocoel led to an increase in ALT activity. The increase in ALT activity was attenuated by pretreatment with  N -acetyl- L -cysteine. Injection of benzoic acid derivatives, ferric sulfate, sodium valproate, tetracycline, amiodarone hydrochloride, methyldopa, ketoconazole, pemoline (Betanamin),  N -nitroso-fenfluramine, and  D -galactosamine also increased ALT activity.    Conclusions  These findings indicate that silkworms are useful for evaluating the effects of chemicals that induce tissue injury in mammals.

Evaluation of drug-induced tissue injury by measuring alanine aminotransferase (ALT) activity in silkworm hemolymph